Compositions and methods for improved efficacy of penicillin-type antibiotics

Abstract

Disclosed are once-a-day penicillin-type antibiotic products comprising at least one modified release dosage form comprising penicillin-type antibiotics and pharmaceutically acceptable carriers, which compositions provide T>MIC90 in the serum for at least 5 hours (preferably for at least five consecutive hours), within a 24-hour dosing interval, for a given bacterial pathogen's MIC90, while providing a total dosage of the penicillin-type antibiotic for a 24-hour dosing interval.

Description

This invention relates to an antibiotic product, to its formulation, and to its use in treating bacterial infections. Particularly, this invention relates to an antibiotic product that contains a penicillin-type antibiotic, as well as to the product's formulation and to its use in treating bacterial infections, wherein the infecting pathogen has an MIC₉₀≧0.06 μg/mL. for the penicillin-type antibiotic used. More particularly, this invention relates to such an antibiotic product that contains a beta-lactam antibiotic, as well as to the product's formulation and to its use in treating bacterial infections. Still more particularly, this invention relates to such a product that contains amoxicillin, to the product's formulation, and to the product's use in treating bacterial infections.

In accordance with an aspect of the invention there is provided a once-a-day penicillin-type antibiotic product for treating a bacterial infection in a patient or subject, comprising a penicillin-type antibiotic composition.

In accordance with a further aspect of the invention the penicillin-type antibiotic composition comprises at least one dosage form, which dosage form comprises at least one penicillin-type antibiotic and a pharmaceutically acceptable carrier. The dosage form(s) is/are formulated such that when the penicillin-type antibiotic composition is administered to a patient or subject in need thereof, the composition provides (or maintains) a concentration of the given penicillin-type antibiotic in the serum at or above the MIC₉₀ for an infecting bacterial pathogen for at least 5 hours within a 24-hour dosing interval. The dosage form(s) is/are further formulated such that the penicillin-type antibiotic composition provides (and preferably maintains) a serum concentration of the given penicillin-type antibiotic that is ≧0.06 μg/mL., and such that the penicillin-type antibiotic composition contains the total dosage of the given penicillin-type antibiotic for a 24-hour dosing interval.

In a further aspect, the once-a-day pharmaceutical formulation providing a daily dosage of penicillin-type antibiotic such as to provide (or maintain) a serum concentration of penicillin-type antibiotic in a patient or subject at or above a bacterial pathogen's drug-specific MIC₉₀ for at least five hours (preferably for at least five consecutive hours) of a 24-hour dosing interval, comprises a modified release dosage form(s) or an immediate release dosage form(s) in combination with a modified release dosage form(s), with such modified release dosage form(s) being: a delayed release dosage form(s), a sustained (or extended) release dosage form(s), and/or combinations of the forgoing. Such sustained (or extended) release dosage forms may be formulated so that initiation of release of the penicillin-type antibiotic therefrom is not substantially delayed after administration of the penicillin-type antibiotic composition or it may be formulated so that initiation of release of the penicillin-type antibiotic therefrom is substantially delayed after administration of the penicillin-type antibiotic composition.

In accordance with a still further aspect of the invention the penicillin-type antibiotic composition may be labeled for use. Such labeling for use may comprise directives conveyed in any tangible or verbal medium of expression to administer the composition once-a-day to a patient or subject in need thereof, to treat an indication known, or suspected, to be caused by a bacterial pathogen, known, or suspected, to have an MIC₉₀≧0.06 μg/mL. for the penicillin-type antibiotic used. As non-limiting examples of the forms in which and/or on which the labeling for use of the penicillin-type antibiotic composition may be expressed there may be mentioned: prescriptions; protocols; labels; packaging; packaging inserts; coatings; embossings; scorings; trademarks and/or trade-dress, or portions thereof, such as by way of marks and/or dress, or portions thereof, denoting daily, once-a-day, one-a-day, 24-hour, and like marks and/or like dress, or portions thereof; imprinted blister packets; capsule shells; and combinations of the foregoing.

In a preferred embodiment of the once-a-day product the penicillin-type antibiotic composition is formulated so as to maintain a concentration of the penicillin-type antibiotic in the serum of the patient or subject at or above the MIC₉₀ of the infecting bacterial pathogen for that penicillin-type antibiotic for at least five consecutive hours out of a 24-hour dosing interval.

As referred to herein, and as is known in the art, the term “MIC₉₀” refers to the minimum concentration of a specific antibiotic that is required to inhibit the growth of ninety percent (90%) of the strains of a specific microorganism (bacterial pathogen) species.

As referred to herein, and as is known in the art, the term “penicillin-type antibiotic” generally and broadly refers to an antibiotic from the penicillin class of antibiotics, and shall include beta-lactams, such as amoxicillin.

After administration to a subject, the concentration of antibiotic may be measured in whole blood or plasma obtained from the subject. As known in the art, such measured antibiotic concentration includes antibiotic bound to serum proteins. As known in the art, unbound antibiotic concentration may be determined by use of a correction factor based on known or measured binding of the antibiotic to serum proteins.

In the treatment of bacterial infections, penicillin-type antibiotics, such as beta-lactams, are generally dosed in formulations that require multiple administrations over the course of any given 24-hour period. As is known in the art, such dosing regimens may be twice-a-day (b.i.d.), whereby the composition is administered every 12 hours; three times daily (t.i.d.), whereby the composition is administered every 8 hours; four times daily (q.i.d.), whereby the composition is administered every 6 hours; or such dosing regimens may even conceive of dosing the composition in excess of four administrations per day. Repeated administrations of a drug throughout a 24-hour period may be disruptive to meals or sleep, thereby presenting a significant inconvenience for patients. In the treatment of elderly or incapacitated patients multiple administration regimens can result in poor compliance, and hence an ineffective treatment of the infection. Existing immediate release and modified release amoxicillin formulations are designed and intended to be administered at least twice-a-day or more, to thereby prolong delivery of the drug throughout the duration of a 24-hour period. Some of these formulations contain relatively high doses of amoxicillin that can exacerbate untoward gastrointestinal side effects, including nausea and diarrhea.

Accordingly, there is a need in the art for effective once-a-day compositions and regimens, that would allow for less frequent dosing, but would neither compromise the effectiveness of the given antibiotic, nor require such a high dosage thereof as would exacerbate side effects or multiply production costs.

In one aspect the present invention provides for a once-a-day pharmaceutical formulation providing a daily dosage of penicillin-type antibiotic, such as to provide a serum concentration of penicillin-type antibiotic in a patient or subject at or above an infecting bacterial pathogen's drug-specific MIC₉₀ for at least five hours within the 24-hour period following administration.

In a preferred aspect the present invention provides for a once-a-day pharmaceutical formulation providing a daily dosage of penicillin-type antibiotic, such as to maintain a serum concentration of penicillin-type antibiotic in a patient or subject at or above an infecting bacterial pathogen's drug-specific MIC₉₀ for at least five consecutive hours within the 24-hour period following administration.

More specifically, in accordance with one aspect of the invention there is provided a once-a-day penicillin-type antibiotic composition comprising at least one dosage form that contains a penicillin-type antibiotic and a pharmaceutically acceptable carrier. In a further aspect of the invention the once-a-day penicillin-type antibiotic composition is formulated so that when administered to a patient, or to subject, it provides a T>MIC₉₀ in the serum for at least 5 hours within the 24-hour period following administration. In a still further aspect of the invention the serum concentration that is provided for at least 5 hours is one that is ≧0.06 μg/mL. In a yet still further aspect of the invention the once-a-day penicillin-type antibiotic composition contains the total dosage of the penicillin-type antibiotic for a twenty-four hour dosing interval.

Preferably, in one aspect of the invention there is provided a once-a-day penicillin-type antibiotic composition comprising at least one dosage form that contains a penicillin-type antibiotic and a pharmaceutically acceptable carrier. In a further preferred aspect of the invention the once-a-day penicillin-type antibiotic composition is formulated so that when administered to a patient, or to a subject, it maintains a T>MIC₉₀ in the serum for at least 5 consecutive hours within the 24-hour period following administration. In a still further preferred aspect of the invention the serum concentration that is maintained for at least 5 consecutive hours is one that is ≧0.06 μg/mL. In a yet still further preferred aspect of the invention the once-a-day penicillin-type antibiotic composition contains the total dosage of the penicillin-type antibiotic for a twenty-four dosing interval.

In one once-a-day embodiment, the composition provides a serum concentration of penicillin-type antibiotic in a patient or subject that is at least equivalent to the drug-specific MIC₉₀ of the bacterial pathogen causing the infection in the patient or subject, for at least five hours within the 24-hour period following administration.

In another once-a-day embodiment, the composition maintains a serum concentration of penicillin-type antibiotic in a patient or subject that is at least equivalent to the drug-specific MIC₉₀ of the bacterial pathogen causing the infection in the patient or subject, for at least five consecutive hours within the 24-hour period following administration.

In one embodiment the composition provides a serum concentration of penicillin-type antibiotic in a patient or subject at or above a given bacterial pathogen's drug-specific MIC₉₀ for at least five hours within the 24-hour period following administration. In another embodiment the composition provides a serum concentration of penicillin-type antibiotic in a patient or subject at or above a given bacterial pathogen's MIC₉₀ for at least six hours within the 24-hour period following administration. In another embodiment the composition provides a serum concentration of penicillin-type antibiotic in a patient or subject at or above a given bacterial pathogen's MIC₉₀ for at least eight hours within the 24-hour period following administration. In another embodiment the composition provides a serum concentration of penicillin-type antibiotic in a patient or subject at or above a given bacterial pathogen's MIC₉₀ for at least nine hours within the 24-hour period following administration. Generally, the composition does not provide a serum concentration of penicillin-type antibiotic in a patient or subject at or above a given bacterial pathogen's MIC₉₀ for more than nine hours within the 24-hour period following administration.

In one embodiment the composition maintains a serum concentration of penicillin-type antibiotic in a patient or subject at or above a given bacterial pathogen's drug-specific MIC₉₀ for at least five consecutive hours within the 24-hour period following administration. In another embodiment the composition maintains a serum concentration of penicillin-type antibiotic in a patient or subject at or above a given bacterial pathogen's MIC₉₀ for at least six consecutive hours within the 24-hour period following administration. In another embodiment the composition maintains a serum concentration of penicillin-type antibiotic in a patient or subject at or above a given bacterial pathogen's MIC₉₀ for at least eight consecutive hours within the 24-hour period following administration. In another embodiment the composition maintains a serum concentration of penicillin-type antibiotic in a patient or subject at or above a given bacterial pathogen's MIC₉₀ for at least nine consecutive hours within the 24-hour period following administration. Generally, the composition does not maintain a serum concentration of penicillin-type antibiotic in a patient or subject at or above a given bacterial pathogen's MIC₉₀ for more than nine consecutive hours within the 24-hour period following administration.

In particularly preferred embodiments the penicillin-type antibiotic is amoxicillin.

Generally, the daily dosage of penicillin-type antibiotic will depend on various factors such as the bacterial pathogen to be targeted, the known resistance or susceptibility of the bacterial pathogen to the given penicillin-type antibiotic, and the known MIC₉₀ of the given bacterial pathogen for the given penicillin-type antibiotic.

Generally, the daily dosage of amoxicillin used in the invention comprises from about 250 to about 3000 mg. Preferably the daily dosage of amoxicillin used in the invention comprises from about 500 to about 2500 mg. More preferably the daily dosage of amoxicillin used in the invention comprises from about 775 to about 1550 mg.

In an embodiment the daily dosage of amoxicillin is 775 mg.

In a further aspect, the present invention provides a method of treating various indications in a patient, or in a subject, caused by bacterial pathogens, which treating comprises administering to the patient, or to the subject, once-a-day the herein-above described and herein-below described penicillin-type antibiotic compositions. As non-limiting examples of the indications for which the herein-above described and herein-below described penicillin-type antibiotic compositions may be used to treat a patient there may be mentioned: pharyngitis, tonsillitis, sinusitis, bronchitis, pneumoniae, ear infection (otitis media), uncomplicated skin and skin structure infections, and uncomplicated urinary infections.

In a further aspect, the present invention provides a method of treating infection in a patient or subject caused by bacterial pathogens, comprising administering to the patient or subject once-a-day the herein-above described and herein-below described penicillin-type antibiotic compositions so as to maintain a serum concentration of penicillin-type antibiotic in a patient or subject at or above a given bacterial pathogen's drug-specific MIC₉₀ for at least five hours (preferably for at least five consecutive hours) of a 24-hour dosing interval. As non-limiting examples of the infectious bacterial pathogens against which the herein-above described and herein-below described penicillin-type antibiotic compositions may be used there may be mentioned Aerobic Gram-positive microorganisms such as Staphylococcus aureus, Streptococcus pneumoniae, Streptococcus pyogenes, Streptococcus agalactiae, Streptococci (Groups C, F, G), and Viridans group streptococci; Aerobic Gram-negative microorganisms such as Haemophilus influenzae, Haemophilus parainfluenzae, Moraxella catarrhalis, Bordetella pertussi, Legionalla pneumophila, Pasteurella multocida and Klebsiella pneumoniae; Anaerobic Gram-positive microorganisms such as Clostridium perfringens, Peptococcus niger, and Propionibacterium acnes; Anaerobic Gram-negative microorganisms such as Prevetolla melaninogenica (formerly Bacterocides melaninogenicus); Mycoplasma pneumoniae; Chlamydia pneumoniae; Mycobacterium avium complex (MAC) consisting of Mycobacterium avium and/or Mycobacterium intracellulare; Helicobacter pylori; Bacterocides fragilis; Fusobacterium nucleatum; Peptostreptococcus magnus; Peptostreptococcus micros; and Escherichia coli.

It will be appreciated by those of ordinary skill in the art that the methods and formulations hereinabove described and hereinbelow described for the penicillin-type antibiotic amoxicillin, or for other beta-lactam antibiotics, are also applicable to amoxicillin, or to other beta-lactam antibiotics, in combination with clavulanate, or in combination with other beta-lactamase inhibitors, particularly for treating infections where beta-lactamase producing pathogens are implicated.

In a further aspect, the once-a-day pharmaceutical formulation providing a daily dosage of penicillin-type antibiotic such as to provide (or maintain) a serum concentration of penicillin-type antibiotic in a patient or subject at or above a bacterial pathogen's drug-specific MIC₉₀ for at least five hours (preferably for at least five consecutive hours) of a 24-hour dosing interval, may comprise a modified release dosage form(s) or an immediate release dosage form(s) in combination with a modified release dosage form(s), with such modified release dosage form(s) being: a delayed release dosage form(s), a sustained (or extended) release dosage form(s), and/or combinations of the forgoing. The formulating of such dosage forms will be apparent to those of skill in the art in view of the disclosures herein further guided by the disclosures of U.S. patent application Ser. Nos. 10/894,787; 10/894,786; 10/894,994; 10/917,059; 10/922,412; and 10/940,265; and by the disclosures of U.S. Pat. Nos. 6,544,555; 6,623,757; and 6,669,948; all of which are hereby incorporated by this reference in their entireties.

In one preferred embodiment the once-a-day pharmaceutical formulation providing a daily dosage of penicillin-type antibiotic, such as to provide (or maintain) a serum concentration of penicillin-type antibiotic in a patient or subject at or above a bacterial pathogen's drug-specific MIC₉₀ for at least five hours, (preferably for at least five consecutive hours) of a 24-hour dosing interval, comprises a sustained (or extended) release dosage form(s). In this embodiment the sustained (or extended) release dosage form(s) is designed and intended to release the penicillin-type antibiotic slowly over time, such as to maintain a serum concentration of penicillin-type antibiotic in a patient or subject at or above a bacterial pathogen's drug-specific MIC₉₀ for at least five consecutive hours.

In a preferred embodiment, the penicillin-type antibiotic composition is a once a day composition, whereby after administration of the penicillin-type antibiotic composition, no further composition is administered during the day; i.e., the preferred regimen is that the composition is administered only once over a twenty-four hour period. Thus, in accordance with the present invention, there is a single administration of a penicillin-type antibiotic composition formulated so as to provide (or maintain) a serum concentration of penicillin-type antibiotic in a patient or subject at or above a bacterial pathogen's drug-specific MIC₉₀ for at least five hours (preferably for at least five consecutive hours) within the 24-hour period following administration. The term single administration means that the total penicillin-type antibiotic administered over a twenty-four hour period is administered at the same time, which can be a single tablet or capsule or two or more thereof, provided that they are administered at essentially the same time.

While the hereinabove described and hereinbelow described compositions may be used to improve the efficacy of any penicillin-type antibiotic, they are particularly useful for improving the efficacy of antibiotics that include a beta-lactam ring or a portion thereof, as non-limiting examples of such antibiotics there may be mentioned penicillin derivatives, such as penicillin V, penicillin G, penicillin, ampicillin, amoxicillin, carbenicillin, ticarcillin, piperacillin, nafcillin, cloxacillin, dicloxacillin, monobactams such as aztreonam, and carbapenems such as imipenem.

In an embodiment of the invention the penicillin-type antibiotic composition comprising at least one modified release dosage form formulated so as to provide (or maintain) a concentration of the given penicillin-type antibiotic in the serum at or above the MIC₉₀ for an infecting bacterial pathogen for at least 5 hours within a 24-hour dosing interval, is further formulated so as to achieve Cmax in the serum for the total penicillin-type antibiotic released from the composition in less than about 12 hours following administration of the penicillin-type antibiotic composition, or following initial release of penicillin-type antibiotic from the penicillin-type antibiotic composition. In this embodiment (as in all embodiments) the dosage form(s) is/are further formulated such that the penicillin-type antibiotic composition provides (and preferably maintains) a serum concentration of the given penicillin-type antibiotic that is ≧0.06 μg/mL., and such that the penicillin-type antibiotic composition contains the total dosage of the given penicillin-type antibiotic for a 24-hour dosing interval.

In another embodiment of the present invention there is provided a penicillin-type antibiotic pharmaceutical composition which is comprised of at least two, preferably at least three, penicillin-type antibiotic dosage forms (at least one of which is a modified release dosage form). Such dosage forms are formulated so that each of the dosage forms has a different release profile and so that the composition provides (and preferably maintains) a penicillin-type antibiotic concentration in the patient's serum that equals or exceeds the pathogen's drug-specific MIC₉₀ for at least five hours (preferably for at least five consecutive hours) within the 24-hour period following administration.

In another embodiment of the invention there are at least two, preferably at least three dosage forms (at least one of which is a modified release dosage form), each of which has a different release profile, the release profile of each of the dosage forms being such that the dosage forms each start release of the penicillin-type antibiotic contained therein at different times after administration of the penicillin-type antibiotic composition, and the composition provides (and preferably maintains) a penicillin-type antibiotic concentration in the patient's serum that equals or exceeds the pathogen's drug-specific MIC₉₀ for at least five hours (preferably for at least five consecutive hours) within the 24-hour period following administration.

Thus, in accordance with this embodiment of the present invention, there is provided a single or unitary antibiotic composition that has contained therein at least two, preferably at least three penicillin-type antibiotic dosage forms (at least one of which is a modified release dosage form), each of which has a different release profile, whereby the penicillin-type antibiotic contained in each of such dosage forms is released at different times, and the penicillin-type antibiotic composition provides a daily dosage of penicillin-type antibiotic, such as to provide (or maintain) a serum concentration of penicillin-type antibiotic in a patient or subject at or above a bacterial pathogen's drug-specific MIC₉₀ for at least five hours (preferably at for least five consecutive hours) within the 24-hour period following administration.

In accordance with another embodiment of the invention, the antibiotic composition may be comprised of at least four different dosage forms, each of which starts to release the penicillin-type antibiotic contained therein at different times after administration of the penicillin-type antibiotic composition, and the composition provides (or maintains) a penicillin-type antibiotic concentration in the patient's serum that equals or exceeds the pathogen's drug-specific MIC₉₀ for at least five hours (preferably for at least five consecutive hours) within the 24-hour period following administration.

The penicillin-type antibiotic composition generally does not include more than five dosage forms with different release times.

In accordance with another embodiment, the penicillin-type antibiotic composition has an overall release profile such that when administered the maximum serum concentration of the total antibiotic released from the composition is reached in less than twelve hours, preferably in less than eleven hours, and that maximum serum concentration is at least equivalent to the drug-specific MIC₉₀ of the bacterial pathogen.

In all embodiments of the invention as herein-above and herein-below described the penicillin-type antibiotic is formulated so as to provide (or maintain) a penicillin-type antibiotic concentration in the patient's serum that equals or exceeds the pathogen's drug-specific MIC, for at least five hours (preferably for at least five consecutive hours) within a 24-hour period when administered once-a-day.

In all embodiments of the invention the composition is designed and intended to provide a serum concentration of ≧0.06 μg/mL. of penicillin-type antibiotic for at least 5 hours.

In preferred embodiments of the invention the composition is designed and intended to provide a serum concentration of ≧0.06 μg/mL. of penicillin-type antibiotic for at least 5 consecutive hours.

In accordance with one embodiment of the invention, there are at least three dosage forms (at least one of which is a modified release dosage form). One of the at least three dosage forms is an immediate release dosage form whereby initiation of release of the penicillin-type antibiotic therefrom is not substantially delayed after administration of the penicillin-type antibiotic composition. The second and third of the at least three dosage forms are delayed release dosage forms (each of which may be a pH sensitive or a non-pH sensitive delayed dosage form, depending on the type of penicillin-type antibiotic composition), whereby the penicillin-type antibiotic released therefrom is delayed until after initiation of release of the penicillin-type antibiotic from the immediate release dosage form. More particularly, the penicillin-type antibiotic released from the second of the at least two dosage forms achieves a Cmax (maximum serum concentration in the serum) at a time after the penicillin-type antibiotic released from the first of the at least three dosage forms achieves a Cmax in the serum, and the penicillin-type antibiotic released from the third dosage form achieves a Cmax in the serum after the Cmax of penicillin-type antibiotic released from the second dosage form and the overall Cmax is at least equivalent to the drug-specific MIC₉₀ of the baterial pathogen.

In one embodiment, the second of the at least two dosage forms initiates release of the penicillin-type antibiotic contained therein at least one hour after the first dosage form, with the initiation of the release therefrom generally occurring no more than six hours after initiation of release of penicillin-type antibiotic from the first dosage form of the at least three dosage forms.

As hereinabove indicated, some embodiments of the penicillin-type antibiotic composition may contain three, four, or more different dosage forms (provided that at least one is a modified release dosage form).

In one three-dosage form embodiment, the penicillin-type antibiotic released from the third dosage form reaches a Cmax at a time later than the Cmax is achieved for the penicillin-type antibiotic released from each of the first and second dosage forms. In a preferred embodiment, release of penicillin-type antibiotic from the third dosage form is started after initiation of release of penicillin-type antibiotic from both the first dosage form and the second dosage form. In one embodiment, Cmax for penicillin-type antibiotic released from the third dosage form is achieved within eight hours.

In another three-dosage form embodiment the release of penicillin-type antibiotic from the second dosage form may be contemporaneous with initiation of release of penicillin-type antibiotic from the first dosage form.

In another three-dosage form embodiment the release of penicillin-type antibiotic from the third dosage form may be contemporaneous with initiation of release of penicillin-type antibiotic from the second dosage form.

In another embodiment, the penicillin-type antibiotic composition may contain four dosage forms (at least one of which is a modified release dosage form), with each of the four dosage forms having different release profiles, whereby the penicillin-type antibiotic released from each of the four different dosage forms achieves a Cmax at a different time.

As hereinabove indicated, in an embodiment, irrespective of whether the antibiotic contains at least two or at least three or at least four different dosage forms each with a different release profile, Cmax for all the penicillin-type antibiotic released from the penicillin-type antibiotic composition is achieved in less than twelve hours, and more generally is achieved in less than eleven hours and is at least equivalent to the drug-specific MIC₉₀ of the bacterial pathogen.

In a preferred embodiment, the penicillin-type antibiotic composition is a once a day composition, whereby after administration of the penicillin-type antibiotic composition, no further composition is administered during the day; i.e., the preferred regimen is that the composition is administered only once over a twenty-four hour period. Thus, in accordance with this preferred embodiment, there is a single administration of an penicillin-type antibiotic composition with the penicillin-type antibiotic being released in a manner such that overall penicillin-type antibiotic release is effected with different release profiles in a manner such that the overall Cmax for the penicillin-type antibiotic composition is reached in less than twelve hours and is at least equivalent to the drug-specific MIC₉₀ of the bacterial pathogen. The term single administration means that the total penicillin-type antibiotic administered over a twenty-four hour period is administered at the same time, which can be a single tablet or capsule or two or more thereof, provided that they are administered at essentially the same time.

In general, each of the dosage forms in the penicillin-type antibiotic compositions may have one or more penicillin-type antibiotics, and each of the dosage forms may have the same penicillin-type antibiotic or different penicillin-type antibiotics.

It is to be understood that when it is disclosed herein that a dosage form initiates release after another dosage form, such terminology means that the dosage form is designed and is intended to produce such later initiated release. It is known in the art, however, notwithstanding such design and intent, some “leakage” of antibiotic may occur. Such “leakage” is not “release” as used herein.

In one four-dosage form embodiment, the fourth dosage form may be a sustained release dosage form or a delayed release dosage form. If the fourth dosage form is a sustained release dosage form, even though Cmax of the fourth dosage form is reached after the Cmax of each of the other dosage forms is reached, penicillin-type antibiotic release from such fourth dosage form may be initiated prior to or after release from the second or third dosage form.

The penicillin-type antibiotic composition of the present invention, as hereinabove described, may be formulated for administration by a variety of routes of administration. For example, the penicillin-type antibiotic composition may be formulated in a way that is suitable for topical administration; administration in the eye or the ear; rectal or vaginal administration; as a nasal preparation; by inhalation; as an injectable; or for oral administration. In a preferred embodiment, the penicillin-type antibiotic composition is formulated in a manner such that it is suitable for oral administration.

For example, in formulating the penicillin-type antibiotic composition for topical administration, such as by application to the skin, the dosage forms, each of which contains a penicillin-type antibiotic, may be formulated for topical administration by including such dosage forms in an oil-in-water emulsion, or a water-in-oil emulsion. In such a formulation, an immediate release dosage form may be in the continuous phase, and a delayed release dosage form may be in a discontinuous phase. The formulation may also be produced in a manner for delivery of three dosage forms as hereinabove described. For example, there may be provided an oil-in-water-in-oil emulsion, with oil being a continuous phase that contains the immediate release component, water dispersed in the oil containing a first delayed release dosage form, and oil dispersed in the water containing a third delayed release dosage form.

It is also within the scope of the invention to provide a penicillin-type antibiotic composition in the form of a patch, which includes penicillin-type antibiotic dosage forms having different release profiles, as hereinabove described.

In addition, the penicillin-type antibiotic composition may be formulated for use in the eye or ear or nose, for example, as a liquid emulsion. For example, the dosage form may be coated with a hydrophobic polymer whereby a dosage form is in the oil phase of the emulsion, and a dosage form may be coated with hydrophilic polymer, whereby a dosage form is in the water phase of the emulsion.

Furthermore, the penicillin-type antibiotic composition having at least one modified release dosage form (whether or not combined with additional dosage forms to provide a plurality of different release profiles) may be formulated for rectal or vaginal administration, as known in the art. This may take the form of a cream, an emulsion, a suppository, or other dissolvable dosage form similar to those used for topical administration.

In a preferred embodiment, the penicillin-type antibiotic composition is formulated in a manner suitable for oral administration. Thus, for example, for oral administration, each of the dosage forms may be used as a pellet or a particle, with a pellet or particle then being formed into a unitary pharmaceutical composition, for example, in a capsule, or embedded in a tablet, or suspended in a liquid for oral administration.

Alternatively, in formulating an oral delivery system, each of the dosage forms of the composition may be formulated as a tablet, with each of the tablets being put into a capsule to produce a unitary antibiotic composition. Thus, as a non-limiting example, a three dosage form antibiotic composition may include a first dosage form in the form of a tablet that is an immediate release tablet, and may also include two or more additional tablets, each of which provides for a delayed release or a sustained release of the penicillin-type antibiotic, as hereinabove described, to provide (and preferably maintain) a serum concentration of the penicillin-type antibiotic at least equivalent to the drug-specific MIC₉₀ of the bacterial pathogen for at least five (preferably for at least five consecutive hours) hours within a 24-hour dosing interval.

The formulation of a penicillin-type antibiotic composition including at least three dosage forms with different release profiles for different routes of administration is deemed to be within the skill of the art from the teachings herein. As known in the art, with respect to delayed release, the time of release can be controlled by a variety of mechanisms such as pH, coating thickness, choice of polymer, and combinations of the foregoing.

In formulating a penicillin-type antibiotic composition in accordance with one embodiment of the invention, an immediate release dosage form of the composition generally provides from about 20% to about 50% of the total dosage of penicillin-type antibiotic to be delivered by the composition, with such immediate release dosage form generally providing at least 25% of the total dosage of the penicillin-type antibiotic to be delivered by the composition. In many cases, an immediate release dosage form provides from about 20% to about 30% of the total dosage of penicillin-type antibiotic to be delivered by the composition; however, in some cases it may be desirable to have an immediate release dosage form provide for about 45% to about 50% of the total dosage of penicillin-type antibiotic to be delivered by the composition.

The remaining dosage forms deliver the remainder of the penicillin-type antibiotic. If more than one modified release dosage form is used each of the modified release dosage forms may provide about equal amounts of penicillin-type antibiotic; however, they may also be formulated so as to provide different amounts.

In accordance with the present invention, each of the dosage forms contains the same penicillin-type antibiotic; however, each of the dosage forms may contain more than one penicillin-type antibiotic.

In one embodiment, where the composition contains one immediate release component and two modified release components, the immediate release component provides from 20% to 35% (preferably 20% to 30%), by weight, of the total penicillin-type antibiotic; where there are three modified release components, the immediate release component provides from 15% to 30%, by weight, of the total penicillin-type antibiotic; and where there are four modified release components, the immediate release component provides from 10% to 25%, by weight, of the total penicillin-type antibiotic.

With respect to the modified release components, where there are two modified release components, the first modified release component (the one released earlier in time) provides from 30% to 60%, by weight, of the total penicillin-type antibiotic provided by the two modified release components with the second modified release component providing the remainder of the penicillin-type antibiotic.

Where there are three modified release components, the earliest released component provides 20% to 35% by weight of the total penicillin-type antibiotic provided by the three modified release components, the next in time modified release component provides from 20% to 40%, by weight, of the penicillin-type antibiotic provided by the three modified release components and the last in time providing the remainder of the penicillin-type antibiotic provided by the three modified release components.

When there are four modified release components, the earliest modified release component provides from 15% to 30%, by weight, the next in time modified release component provides from 15% to 30%, the next in time modified release component provides from 20% to 35%, by weight, and the last in time modified release component provides from 20% to 35%, by weight, in each case of the total penicillin-type antibiotic provided by the four modified release components.

The Immediate Release Component

The immediate release portion of this system can be a mixture of ingredients that breaks down quickly after administration to release the penicillin-type antibiotic. This can take the form of either a discrete pellet or granule that is mixed in with, or compressed with, the other three components.

The materials to be added to the penicillin-type antibiotics for the immediate release component can be, but are not limited to, microcrystalline cellulose, corn starch, pregelatinized starch, potato starch, rice starch, sodium carboxymethyl starch, hydroxypropylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, ethylcellulose, chitosan, hydroxychitosan, hydroxymethylatedchitosan, cross-linked chitosan, cross-linked hydroxymethyl chitosan, maltodextrin, mannitol, sorbitol, dextrose, maltose, fructose, glucose, levulose, sucrose, polyvinylpyrrolidone (PVP), acrylic acid derivatives (Carbopol, Eudragit, etc.), polyethylene glycols, such a low molecular weight PEGs (PEG2000-10000) and high molecular weight PEGs (Polyox) with molecular weights above 20,000 daltons.

It may be useful to have these materials present in the range of 1.0 to 60% (W/W).

In addition, it may be useful to have other ingredients in this system to aid in the dissolution of the drug, or the breakdown of the component after ingestion or administration. These ingredients can be surfactants, such as sodium lauryl sulfate, sodium monoglycerate, sorbitan monooleate, sorbitan monooleate, polyoxyethylene sorbitan monooleate, glyceryl monostearate, glyceryl monooleate, glyceryl monobutyrate, one of the non-ionic surfactants such as the Pluronic line of surfactants, or any other material with surface active properties, or any combination of the above.

These materials may be present in the range of 0.05-15% (W/W).

The non-pH Sensitive Delayed Release Component

The components in this composition are the same as the immediate release unit, but with additional polymers integrated into the composition, or as coatings over the pellet or granule.

Several methods to affect a delayed release with non-pH dependent polymers are known to those skilled in the art. These include soluble or erodible barrier systems, enzymatically degraded barrier systems, rupturable coating systems, and plugged capsule systems among others. These systems have been thoroughly described in the literature (see “A Review of Pulsatile Drug Delivery” by Bussemer and Bodmeier in the Winter 2001 issue of American Pharmaceutical Review) and formulations and methods for their manufacture are hereby incorporated by reference.

Materials that can be used to obtain a delay in release suitable for this component of the invention can be, but are not limited to, polyethylene glycol (PEG) with molecular weight above 4,000 daltons (Carbowax, Polyox), waxes such as white wax or bees wax, paraffin, acrylic acid derivatives (Eudragit), propylene glycol, and ethylcellulose.

Typically these materials can be present in the range of 0.5-25% (W/W) of this component.

The pH Sensitive (Enteric) Release Component

The components in this composition are the same as the immediate release component, but with additional polymers integrated into the composition, or as coatings over the pellet or granule.

The kind of materials useful for this purpose can be, but are not limited to, cellulose acetate pthalate, Eudragit L, Eudragit S, Eudragit FS, and other pthalate salts of cellulose derivatives.

These materials can be present in concentrations from 4-20% (W/W).

Sustained Release Component

The components in this composition are the same as the immediate release component, but with additional polymers integrated into the composition, or as coatings over the pellet or granule.

The kind of materials useful for this purpose can be, but are not limited to, ethylcellulose; hydroxypropylmethylcellulose; hydroxypropylcellulose; hydroxyethylcellulose; carboxymethylcellulose; methylcellulose; nitrocellulose; Eudragit R; Eudragit RS; and Eudragit RL; Carbopol; or polyethylene glycols with molecular weights in excess of 8,000 daltons.

These materials can be present in concentrations from 4-20% (W/W).

When it is desired to delay inititiation of release of the sustained release dosage form, an appropriate coating may be used to delay inititiation of the sustained release, such as a pH sensitive or a non-pH sensitive coating.

The non-pH Sensitive Coating for Sustained Release Dosage Form

Materials that can be used to obtain a delay in release suitable for this component of the invention can be, but are not limited to, polyethylene glycol (PEG) with molecular weight above 4,000 daltons (Carbowax, Polyox), waxes such as white wax or bees wax, paraffin, acrylic acid derivatives (Eudragit RS), cellulose acetate, and ethylcellulose.

Typically these materials can be present in the range of 0.5-25% (W/W) of this component. Preferably the materials are present in an amount just enough to provide the desired in vivo lag time and T_max.

The pH Sensitive Coating for Sustained Release Dosage Form

The kind of materials useful for this purpose can be, but are not limited to, cellulose acetate pthalate, Eudragit L, Eudragit S, Eudragit FS, and other pthalate salts of cellulose derivatives.

These materials can be present in concentrations from 4-20% (W/W) or more. Preferably the materials are present in an amount just enough to provide the desired in vivo lag time and T_max.

As hereinabove indicated, the units comprising the penicillin-type antibiotic composition of the present invention can be in the form of discrete pellets or particles contained in the capsule, or particles embedded in a tablet or suspended in a liquid suspension.

The penicillin-type antibiotic composition of the present invention may be administered, for example, by any of the following routes of administration: sublingual, transmucosal, transdermal, parenteral, etc., and preferably is administered orally. The composition includes a therapeutically effective amount of the penicillin-type antibiotic, which amount will vary with the penicillin-type antibiotic to be used, the disease or infection to be treated, and the number of times that the composition is to be delivered in a day. The composition is administered to a patient or subject in an amount effective for treating a bacterial infection.

This system will be especially useful in extending the practical therapeutic activity for antibiotics with elimination half lives of less than 20 hours and more particularly with elimination half-lives of less than 12 hours, and will be particularly useful for those drugs with half-lives of 2-10 hours. The following are examples of some antibiotics with half-lives of about 1 to 12 hours: imipenem, ertapenem, (carbapenems) penicillin V, penicillin salts, and complexes, methicillin, nafcillin, oxacillin, cloxacillin, dicloxacillin, amoxicillin, amoxicillin and clavulanate potassium, ampicillin, bacampicillin, carbenicillin indanyl sodium (and other salts of carbenicillin) mezlocillin, piperacillin, piperacillin and taxobactam, ticarcillin, ticarcillin and clavulanate potassium, (penicillins).

The penicillin-type antibiotic composition should be administered for a sufficient amount of time to treat the infection. In one embodiment the penicillin-type antibiotic composition is administered for 10 days.

The invention will be further described with respect to the following examples; however, the scope of the invention is not limited thereby. All percentages in this specification, unless otherwise specified, are by weight.

The following examples detail the general procedures for making immediate release, delayed release (both pH sensitive and non-pH sensitive types), sustained release, and delayed sustained release components for the dosage form of the present invention. Any combination of the components that results in the desired time above MIC would be included as part of this disclosure. Specific examples of combinations of the components are given, but are not limited to the ones described herein. Additionally, there is an example of a multi-unit dosage form specific to amoxicillin type tablets, but any appropriate therapeutic agent could be substituted.

EXAMPLES

I. Immediate Release Component

Formulate the composition by mixing the ingredients in a suitable pharmaceutical mixer or granulator such as a planetary mixer, high-shear granulator, fluid bed granulator, or extruder, in the presence of water or other solvent, or in a dry blend. If water or other solvent was used, dry the blend in a suitable pharmaceutical drier, such as a vacuum oven or forced-air oven. The product may be sieved or granulated, and compressed using a suitable tablet press, such as a rotary tablet press, or filled into a capsule or sachet with a suitable filler.

	Ingredient	Conc. (% W/W)
	Example 1:	Amoxicillin	65%	(W/W)
		Microcrystalline cellulose	20
		Povidone	10
		Croscarmellose sodium	5
	Example 2:	Amoxicillin	55%	(W/W)
		Microcrystalline cellulose	25
		Povidone	10
		Croscarmellose sodium	10
	Example 3:	Amoxicillin	65%	(W/W)
		Microcrystalline cellulose	20
		Hydroxypropylcellulose	10
		Croscarmellose sodium	5
	Example 4:	Amoxicillin	75%	(W/W)
		Polyethylene glycol 4000	10
		Polyethylene glycol 2000	10
		Hydroxypropylcellulose	5
	Example 5:	Amoxicillin	75%	(W/W)
		Polyethylene glycol 8000	20
		Polyvinylpyrrolidone	5
	Example 6:	Clarithromycin	65%	(W/W)
		Microcrystalline cellulose	20
		Hydroxypropylcellulose	10
		Croscarmellose sodium	5
	Example 7:	Clarithromycin	75%	(W/W)
		Microcrystalline cellulose	15
		Hydroxypropylcellulose	5
		Croscarmellose sodium	5
	Example 8:	Clarithromycin	75%	(W/W)
		Polyethylene glycol 4000	10
		Polyethylene glycol 2000	10
		Hydroxypropylcellulose	5
	Example 9:	Clarithromycin	75%	(W/W)
		Polyethylene glycol 8000	20
		Polyvinylpyrrolidone	5
	Example 10:	Ciprofloxacin	65%	(W/W)
		Microcrystalline cellulose	20
		Hydroxypropylcellulose	10
		Croscarmellose sodium	5
	Example 11:	Ciprofloxacin	75%	(W/W)
		Microcrystalline cellulose	15
		Hydroxypropylcellulose	5
		Croscarmellose sodium	5
	Example 12:	Ciprofloxacin	75%	(W/W)
		Polyethylene glycol 4000	10
		Polytheylene glycol 2000	10
		Hydroxypropylcellulose	5
	Example 13:	Cirpofloxacin	75%	(W/W)
		Polyethylene glycol 8000	20
		Polyvinylpyrrolidone	5
	Example 14:	Ceftibuten	75%	(W/W)
		Polyethylene glycol 4000	10
		Polyethylene glycol 2000	10
		Hydroxypropylcellulose	5
	Example 15:	Ceftibuten	75%	(W/W)
		Polyethylene Glycol 4000	20
		Polyvinylpyrrolidone	5

II. non-pH Sensitive Delayed Release Component

Any of the methods described in “A Review of Pulsatile Drug Delivery” by Bussemer and Bodmeier in the Winter 2001 issue of American Pharmaceutical Review may be utilized to make the pH independent delayed release component described. Examples 16 and 17 utilize an organic acid layer underneath a layer of Eudragit RS to result in a rapid increase in the permeability of the Eudragit film after a set amount of time depending on the permeability and thickness of the film thus allowing the inner core to release through the Eudragit membrane. Example 18 utilizes a core with a highly swellable polymer that ruptures the insoluble coating membrane after a certain amount of time determined by the permeability, plasticity and thickness of the external cellulose acetate membrane. The coatings are applied to the core via methods such as wurster column coating in a fluid bed processor as known to those skilled in the art.

Additionally, this component may be formed as in example 19. In this example the component is prepared by mixing the ingredients in a suitable pharmaceutical mixer or granulator such as a planetary mixer, high-shear granulator, fluid bed granulator, or extruder, in the presence of water or other solvent, or in a hot melt process. If water or other solvent was used, dry the blend in a suitable pharmaceutical drier, such as a vacuum oven or forced-air oven.

After the component is allowed to cool, the product may be sieved or granulated, and compressed using a suitable tablet press, such as a rotary tablet press, or filled into a capsule with a suitable encapsulator.

	Ingredient	Conc. (% W/W)
	Example 16:	Core from Example 4	65%	(W/W)
		Citric Acid	10
		Eudragit RS Polymer	20
		Talc	4
		TEC	1
	Example 17:	Core from Example 9	75%	(W/W)
		Citric Acid	10
		Eudragit RS Polymer	10
		Talc	4
		TEC	1
	Example 18:	Core from Example 1	93%	(W/W)
		Cellulose Acetate	6.75
		PEG 400	0.25
	Example 19:	Ciprofloxacin	70%	(W/W)
		Polyox	20
		Hydroxypropylcellulose	5
		Croscarmellose sodium	5

III. Enteric Release Component

Examples 20-27 utilize film coating techniques commonly known to those skilled in the art to create the enteric release component by layering of such enteric polymers onto an active core. In general the steps involve first making a coating dispersion or solution in organic or aqueous solvent. Second, the coating is applied at the proper conditions to produce an acceptably uniform film. This is done in a suitable coating apparatus such as a pan coater or a fluid bed wurster column coater. Optionally the product may be further cured if necessary.

To create a matrix type enteric component, formulate the ingredients of examples 28-32 by mixing the ingredients in a suitable pharmaceutical mixer or granulator such as a planetary mixer, high-shear granulator, fluid bed granulator, or extruder, in the presence of water or other solvent, or in a hot melt process. If water or other solvent was used, dry the blend in a suitable pharmaceutical drier, such as a vacuum oven or forced-air oven. Allow the product to cool.

The product produced by either manner may be sieved or granulated, and compressed using a suitable tablet press, such as a rotary tablet press, or filled into capsules using a suitable capsule filler such as a MG2 Futura.

	Ingredient	Conc. (% W/W)
Example 20:	Core from Example 1	65%	(W/W)
	Cellulose Acetate Pthalate	30
	TEC	5
Example 21:	Core from Example 5	75%	(W/W)
	Cellulose Acetate Pthalate	20
	Triacetin	5
Example 22:	Core from Example 1	65%	(W/W)
	Eudragil L	25
	Talc	8
	TEC	2
Example 23:	Core from Example 1	65%	(W/W)
	Eudragit FS	28
	Talc	5
	TEC	2
Example 24:	Core from Example 1	65%	(W/W)
	Eudragit S	28
	Talc	5
	TEC	2
Example 25:	Core from Example 7	75%	(W/W)
	Eudragit L	20
	Talc	3.5
	TEC	1.5
Example 26:	Core from Example 11	60%	(W/W)
	Eudragit L	35
	Talc	4
	TEC	1
Example 27:	Core from Example 15	65%	(W/W)
	Cellulose Acetate Pthalate	32.5
	TEC	2.5
Example 28:	Amoxicillin	75%	(W/W)
	Microcrystalline Cellulose	5
	Hydroxypropylcellulose pthalate	20
Example 29:	Amoxicillin	60%	(W/W)
	Lactose	10
	Eudgragit L 30D	30
Example 30:	Ciprofloxacin	70%	(W/W)
	Polyethylene glycol 4000	10
	Cellulose acetate pthalate	20
Example 31:	Clarithromycin	60%	(W/W)
	Polyethylene glycol 2000	10
	Lactose	20
	Eudragit L 30D	10
Example 32:	Ceftibuten	70%	(W/W)
	Microcrystalline cellulose	20
	Cellulose acetate pthalate	10

IV. Sustained Release Component

Examples 33-38 utilize film coating techniques commonly known to those skilled in the art to create the sustained release component by layering of such sustained release polymers onto an active core. In general the steps involve first making a coating dispersion or solution in organic or aqueous solvent. Second, the coating is applied at the proper conditions to produce an acceptably uniform film. This is done in a suitable coating apparatus such as a pan coater or a fluid bed wurster column coater. Optionally the product may be further cured if necessary. Curing studies are recommended with sustained release membranes.

To create a matrix type sustained release component, formulate the ingredients of example 39-42 by mixing the ingredients in a suitable pharmaceutical mixer or granulator such as a planetary mixer, high-shear granulator, fluid bed granulator, or extruder, in the presence of water or other solvent, or in a hot melt process. If water or other solvent was used, dry the blend in a suitable pharmaceutical drier, such as a vacuum oven or forced-air oven. Allow the product to cool.

The product produced by either manner may be sieved or granulated, and compressed using a suitable tablet press, such as a rotary tablet press, or filled into capsules using a suitable capsule filler such as a MG2 Futura.

	Ingredient	Conc. (% W/W)
	Example 33:	Core from Example 1	75%	(W/W)
		Ethylcellulose	20
		HPC	5
	Example 34:	Core from Example 5	80%	(W/W)
		Eudragit RS	10
		Eudragit RL	5
		Talc	3
		TEC	2
	Example 35:	Core from Example 5	90%	(W/W)
		Ethylcellulose	9
		Triacetin	1
	Example 36:	Core from Example 7	90%	(W/W)
		Surelease	10
	Example 37:	Core from Example 11	85%	(W/W)
		Kollicoat SR	10
		TBC	5
	Example 38:	Core from Example 15	80%	(W/W)
		Polyethylene glycol 8000	5
		Eudgragit RS 30D	15
	Example 39:	Amoxicillin	75%	(W/W)
		Hydroxyethylcellulose	10
		Polyethylene glycol 4000	10
		Hydroxypropylcellulose	5
	Example 40:	Ciprofloxacin	75%	(W/W)
		Lactose	10
		Povidone (PVP)	10
		Polyethylene glycol 2000	5
	Example 41:	Clarithromycin	75%	(W/W)
		Polyethylene glycol 4000	10
		Povidone (PVP)	10
		Hydroxypropylcellulose	5
	Example 42:	Ceftibuten	75%	(W/W)
		Lactose	15
		Polyethylene glycol 4000	5
		Polyvinylpyrrolidone	5

III. Sustained Release Dosage Form with Coating to Delay Initiation of Sustained Release:

Delaying the initiation of the sustained release of antibiotic in the present invention is achieved by either coating the immediate release component bead with a sustained release coating and then subsequently applying an enteric coating or non pH sensitive delayed release coating to that coated bead, or alternatively the sustained release matrix component bead may be coated with an enteric coating or non pH sensitive delayed release coating.

Coatings can be applied to either the sustained release coated beads or the sustained release matrix beads to form a product which pulses the therapeutical agent in a desired environment or location of the GI tract.

III A. The following examples describe the detailed preparation of the sustained-release coating materials to be applied to the immediate release beads from section I of the examples, resulting in a sustained release component of the invention.

Example 43

Eudragit RS Example—Organic Coating

Component
Part A           Percentage (%)
Eudragit RS-100  6.0
Triethyl Citrate 1.0
Talc             0.5
Acetone          92.5

• Step 1. Dissolve Eudragit in Acetone.
• Step 2. Mix TEC and talc in a separate container with some Acetone.
• Step 3. Add step 2 to Step 1, and allow to mix for 20 minutes before spraying.

Example 44

Surelease™ Example—Aqueous Coating

Component
Part A         Percentage (%)
Surelease      90
Purified Water 10.0

• Step 1. Mix surelease and water for 30 minutes before spraying.

Directions for application of the sustained release coating to the beads:

Charge a wurster column equipped fluid bed with the beads to be coated. Spray the coating onto the beads at a rate and temperature known to those skilled in the art of bead coating so as to efficiently coat the beads to give a weight gain of between 4 and 20%. Dry the beads to the specified level of coating solvent for optimum handling and stability. Cure the beads for additional congealing of the sustained release film if required.

III B. The following are examples of the pH sensitive, or enteric release, coating that can be used to optionally delay the onset of action of any or all of the second, third, or additional dosage forms.

The composition of the aqueous Eudragit L30D-55 dispersion to be applied to the immediate release components that have been treated with the above-described sustained release coatings, or to the sustained-matrix pellets is provided below in Example 45.

Example 45

Eudragit® L 30 D-55 Aqueous Coating Dispersion

Component            Percentage (%)
Eudragit ® L 30 D-55 55.0
Triethyl Citrate     1.6
Talc                 8.0
Purified Water       37.4
Solids Content       25.5
Polymer Content      15.9

Preparation Procedure for an Eudragit® L 30 D-55 Aqueous Dispersion

• Step 1 Suspend triethyl citrate and talc in deionized water.
• Step 2 The TEC/talc suspension is then homogenized using a PowerGen 700 high shear mixer.
• Step 3 Add the TEC/talc suspension slowly to the Eudragit® L 30 D-55 latex dispersion while stirring.
• Step 4 Allow the coating dispersion to stir for one hour prior to application onto the matrix pellets.

Example 46

Preparation of an Eudragit® S 100 Aqueous Coating Dispersion

Dispersion Formulation

The composition of the aqueous Eudragit® S 100 dispersion applied to the matrix pellets is provided below:

Eudragit ® S 100 Aqueous Coating Dispersion
Component              Percentage (%)
Part A
Eudragit ® S 100       12.0
1 N Ammonium Hydroxide 6.1
Triethyl Citrate       6.0
Purified Water         65.9
Part B
Talc                   2.0
Purified Water         8.0
Solid Content          20.0
Polymer Content        12.0

Preparation Procedure for an Eudragit® S 100 Aqueous Dispersion

Part I:

• • (i) Dispense Eudragit® S 100 powder in deionized water with stirring.
  • (ii) Add ammonium hydroxide solution drop-wise into the dispersion with stirring.
  • (iii) Allow the partially neutralized dispersion to stir for 60 minutes.
  • (iv) Add triethyl citrate drop-wise into the dispersion with stirring. Stir for about 2 hours prior to the addition of Part B.

Part II:

• • (i) Disperse talc in the required amount of water
  • (ii) Homogenize the dispersion using a PowerGen 700D high shear mixer.
  • (iii) Part B is then added slowly to the polymer dispersion in Part A with a mild stirring.

Coating Conditions for the Application of Aqueous Coating Dispersions

The following coating parameters were used to coat matrix pellets with each of the Eudragit® L 30 D-55 and Eudragit® S 100 aqueous film coating.

Coating Equipment        STREA 1 ™ Table Top Laboratory
                         Fluid Bed Coater
Spray nozzle diameter    1.0 mm
Material Charge          300 gram
Inlet Air Temperature    40 to 45° C.
Outlet Air Temperature   30 to 33° C.
Atomization Air Pressure 1.8 Bar
Pump Rate                2 gram per minute

• • (i) Coat matrix pellets with L30 D-55 dispersion such that you apply 12% coat weight gain to the pellets.
  • (ii) Coat matrix pellets with S100 dispersion such that you apply 20% coat weight gain to the pellets.

III. C. The following examples describe the detailed preparation of the non pH sensitive coating materials to be used to optionally delay the onset of action of any or all of the second, third, or additional dosage forms.

Example 47

Rupturable Film

Component
Part A                   Percentage (%)
Cellulose Acetate 398-10 6.0
PEG 400                  1.5
Acetone                  92.5

• Step 1. Dissolve cellulose acetate in Acetone.
• Step 2. Add TEC to Step 1, and allow to mix for 20 minutes.

Directions for application of the sustained release coating to the beads:

Charge a wurster column equipped fluid bed with the beads to be coated. The beads must contain a component which will swell rapidly upon exposure to moisture. Beads containing croscarmellose sodium in Section I are good candidates as are beads with swellable hydrophilic polymers from Section II. Spray the coating onto the beads at a rate and temperature known to those skilled in the art of bead coating so as to efficiently coat the beads to give a weight gain of between 4 and 20%. Dry the beads to the specified level of coating solvent for optimum handling and stability.

Coating Conditions for the Application of the Rupturable Film Coating.

The following coating parameters were used to coat matrix mini tablets from a previous example with the rupturable film coating. A 2.5% weight gain provided the desired lag time.

Coating Equipment        Vector LDCS Coating
                         System with 1.3 L pan
Spray nozzle diameter    0.8 mm
Material Charge          800 grams
Inlet Air Temperature    40 to 45° C.
Outlet Air Temperature   18 to 23° C.
Atomization Air Pressure 25 psi
Pump Rate                6 grams per minute

The enteric coatings and non-pH sensitive coatings as described above can be applied to either a sustained release matrix bead as in examples 16-25, or to the immediate release component beads that have been previously treated with a sustained release coating, to thereby provide a sustained release bead with a delayed onset of action. In addition, the enteric coating or non-pH sensitive coating can be applied to the immediate release component bead directly to provide delayed onset of action.

IV. Example Final Compositions

After one or all of the desired individual components are manufactured, the final dosage form is assembled and may take the shape of a tablet, capsule or sachet. Preferably the final dosage form takes the shape of a capsule or tablet. Most preferably the final dosage form is a tablet.

One or more of the individual components can be used to achieve the desired T>MIC. If one were to include three components in one's dosage form then preferably the first, second, and third dosage forms provide 20-70%, 10-70% and 10-70% of the total dosage form, respectively. More preferably the ratio of first, second and third dosage forms are in the range of 25-66%, 15-60% and 15-60% of the total dosage form respectively. Most preferably the ratio of the first, second and third dosage forms are in the range of 33-60%, 25-50%, and 25-50% respectively. One can also utilize one, two, three, or four or more components, and balance the ratio of the components in such a way to meet the T>MIC criteria.

V. Example of Three Component Amoxicillin Tablet and Sprinkle Dosage Forms

V-1. Description of the Dosage Form

API content can range for example from 10 to 80% therapeutic compound, and in the case the therapeutic compound is amoxicillin, it most preferably would contain 775 mg amoxicillin. The tablet can be of any desired shape, with a target gross weight of approximately 1500 mg. The tablet can optionally be coated with a film, and/or imprinted.

The following specific example is written for components that contain amoxicillin, however other therapeutic agents can be substituted with proper proportion adjustments known to one skilled in the art of oral dosage form development.

The tablet of this invention is a rapidly disintegrating formulation containing three active intermediate compositions, an immediate-release granulation (Amoxicillin Granules) and two functionally coated delayed-release pellets (Amoxicillin Pulse 2 Pellets and Amoxicillin Pulse 3 Pellets). Non-functional, color and clear film coats are optionally applied to the outer surface and/or the coated tablets are imprinted.

FIG. 1 is a flowchart describing the General Procedure to Make a Multiparticulate Tablet.

Table 1 provides the qualitative and quantitative composition of three example amoxicillin tablet formulations on a weight to weight (w/w %) basis of individual ingredients. For formulation B, an example set of procedures and component compositions for making this type of tablet is expanded. Table 2 provides the qualitative and quantitative composition of an example amoxicillin Tablet formulation on the basis of the tablet core, coatings, and its active intermediate compositions. Tables 3, 4, 5, and 6 provide the qualitative and quantitative composition of the Amoxicillin Granules, Amoxicillin Core Pellets, Amoxicillin Pulse 2 Pellets, and Amoxicillin Pulse 3 Pellets, respectively. An optional coating can be applied and optional tablet imprinting can be used to complete the product presentation.

TABLE 1
Example Quantitative Compositions of Example Amoxicillin Tablets.
Component	A (w/w %)	B (w/w %)	C (w/w %)
Amoxicillin, USP	78.476	59.524	62.821
Silicified	0.000	20.676	21.900
Microcrystalline Cellulose
Crospovidone, NF	0.000	3.892	4.100
Methacrylic Acid	4.272	2.926	2.879
Copolymer Dispersion, NF
Opadry ® Blue1	0.000	2.415	0.000
Talc, USP	3.617	2.036	1.804
Hydroxypropyl	4.107	1.939	1.229
Methylcellulose Acetate
Succinate1
Microcrystalline	4.276	1.787	1.545
Cellulose, NF
Povidone, USP	1.716	1.546	1.691
Opadry ® Clear1	0.000	0.966	0.000
Magnesium Stearate, NF	0.000	0.966	1.000
Triethyl Citrate, NF	1.806	0.939	0.694
Polyoxyl 35 Castor Oil,	0.843	0.345	0.299
NF
Sodium Lauryl Sulfate,	0.129	0.062	0.039
NF
Opadry II White,	0.761	0.000	0.000
33G28523
Opacode ® Black1	0.000	Trace Amount	0.0
Purified Water, USP1	*	*	*
Total	100.0	100.0	100.0
1Water removed during processing

TABLE 2
Composition of an Example Amoxicillin Tablet by component.
Core Tablet                      w/w %
Amoxicillin Granules             28.6
Amoxicillin Pulse 2 Pellets      24.1
Amoxicillin Pulse 3 Pellets      20.9
Silicified Microcrystalline Cellulose 21.4
Crospovidone                     4.0
Magnesium Stearate               1.0
Core Tablet Weight               100

V-2 Amoxicillin Granules

TABLE 3
Qualitative and Quantitative Composition of Amoxicillin Granules
Component                  w/w %
Amoxicillin                97.0
Povidone                   3.0
Purified Water1            N/A
Total Amoxicillin Granules 100
1Water removed during processing

General Procedure for Manufacturing Amoxicillin Granules:

A standard wet granulation process known to one skilled in the art is used for preparation of the Amoxicillin Granules. The wet granules are discharged and fed into a Dome Extrusion Granulator. The wet extruded granules are then dried for a fixed period of time or until the LOD (loss on drying) of the granules is suitable for the formulation, typically less than 15%. The dried granules are then sized in a Rotating Impeller Screening Mill. The milled material is collected into drums.

V-3 Amoxicillin Core Pellets

The Core Pellets are used as the starting material for the later preparation of the Pulse 2 Pellets and the Pulse 3 Pellets used in the tablet preparation. They also serve as the core pellet for the immediate release pellet in the sprinkle dosage form. The core pellets are prepared using the unit operations of wet granulating, extruding, spheronizing, fluid bed drying and sizing. The composition of the core pellets is listed in Table 4.

TABLE 4
Composition of Amoxicillin Core Pellets
Amoxicillin Trihydrate (92%) Pellet
Component                        w/w %
Amoxicillin Trihydrate, Powder Grade, USP 92.0
Microcrystalline Cellulose, NF   5.0
Povidone K30, USP                2.0
Polyoxyl 35 Castor Oil, NF       1.0
Total                            100

V-4 Amoxicillin Pulse 2 Pellets

Table 5 lists the composition of the example Amoxicillin Pulse 2 Pellets.

TABLE 5
Composition of Amoxicillin Pulse 2 Pellets
Component                        w/w %
Amoxicillin                      76.6
Microcrystalline Cellulose (Avicel ® PH-101) 4.19
Povidone (Kollidon 30)           1.69
Polyoxyl 35 Castor Oil (Cremophor EL) 0.80
Methacrylic Acid Copolymer       10.41
Dispersion (Eudragit ® L30D-55)1
Talc                             5.19
Triethyl Citrate                 1.00
Purified Water2                  N/A
Total Amoxicillin Pulse 2 Pellets 100.0
1Amount per tablet of the solids content
2Water removed during processing

The Amoxicillin Pulse 2 Pellets are prepared by coating the previously prepared Amoxicillin Core Pellets with a functional film coat of methacrylic acid copolymer dispersion, 20% w/w. Prior to the coating process, a dispersion of the methacrylic acid copolymer is made according to the manufacturer's instructions. The dispersion is applied to the Amoxicillin Core pellets using a Fluid Bed Bottom Spray Coater, equipped with appropriate spray nozzles and a fixed column gap distance.

The pellets are then appropriately sized. The Amoxicillin Pulse 2 Pellets may be held in ambient warehouse conditions until further processing.

V-5 Amoxicillin Pulse 3 Pellets

The amoxicillin pulse 3 pellets are prepared by coating the previously prepared Amoxicillin Core Pellets with a 5% w/w subcoat of methacrylic acid copolymer, followed by a 20% w/w functional film coat of hypromellose acetate succinate.

Table 6 lists the composition of the example amoxicillin Pulse 3 pellets

TABLE 6
Composition of Amoxicillin Pulse 3 Pellets
                                 Amount/Tablet
Component                        (mg)
Amoxicillin                      222.6
Microcrystalline Cellulose (Avicel ® PH-101) 12.1
Povidone (Kollidon 30)           4.8
Polyoxyl 35 Castor Oil (Cremophor EL) 2.4
Methacrylic Acid Copolymer Dispersion 7.6
(Eudragit ® L30D-55)1
Hypromellose Acetate Succinate (AQOAT AS-HF) 29.0
Talc                             12.4
Triethyl Citrate                 10.6
Sodium Lauryl Sulfate            0.9
Purified Water2                  N/A
Total Amoxicillin Pulse 3 Pellets 302.4
1Amount per tablet of the solids content
2Water removed during processing

Prior to the subcoating process, a dispersion of the methacrylic acid copolymer is made according to the manufacturer's instructions. The second coating material, the hypromellose acetate succinate dispersion is prepared according to the manufacturer's instructions. The subcoat layer, is then applied to the Amoxicillin Core Pellets using the same Fluid Bed Bottom Spray Coater as used for preparation of the Pulse 2 Pellets.

The hypromellose acetate succinate coating dispersion is then immediately applied to the sub-coated pellets still in the Fluid Bed Bottom Spray Coater. The atomization air used for the second coating process is set at the same pressure as used for the sub coating process. The coating process is complete when all of the dispersion has been applied. Following a drying period the final coated pellets are cooled.

The coated, dried and cooled Amoxicillin Pulse 3 Pellets are collected into lined drums The coated Pulse 3 Pellets are then sized. The Amoxicillin Pulse 3 Pellets may be held in ambient warehouse conditions until further processing.

V-6 Tabletting

• • 1.2 The amoxicillin granules, pulse 2 pellets and pulse 3 pellets can be combined at the desired ratio and compressed on a rotary or other type of tablet press with suitable tooling installed for the desired size tablet. Ratios of Pulses or pellets can vary depending on the absorption characteristics of the desired drug. Ratios can range from front loaded (middle loaded or back loaded as per discussion in the specs section. The percent of each component can range from 10-90% for each of the at least 3 components in this example. For example, but not in anyway limiting, pulse 1 can be 10%, pulse 2 can be 80% and pulse 3 can be 10%. Or, as an alternate non-limiting example, pulse 1 can be 30%, pulse 2 can be 50% and pulse 3 can be 20%. In a preferred embodiment the tablet is manufactured by combining the immediate-release granulation (Pulse 1, 45%) with two functionally coated delayed-release pellets (Pulse 2, 30% and Pulse 3, 25%).V-7 Optional Coatings

An additional optional coating can be applied to the tablet, or directly to the core, pulse 2 and pulse 3 pellets according to the manufacturer's recommendation for the coating process conditions and procedures.

An optional printing on the tablets can be done using a formula as supplied by the manufacturer or as modified to suit the tablet characteristics. Additional optional ingredients are Microcrystalline Cellulose and Colloidal Silicon Dioxide. These can be added to prevent tacking and sticking if necessary. These two materials can be optionally obtained as the composition Prosolv SMCC® 90 (FMC).

V-8 Sprinkle Dosage Form

These coated or uncoated pellets can be filled to give the desired dose into an appropriate dosing device at the desired ratios as described above either separately or all together, such as a sachet, capsule, or other means of delivering the material to the consumer.

For example the core pellets may be coated with a non-functional immediate release film coating to produce Pulse 1 pellets. The Pulse 1 pellets as well as Pulse 2 and Pulse 3 pellets may be used as a sprinkle product by placing the Pulse 1, Pulse 2 and Pulse 3 pellets in a sachet, capsule or other form that can be used for simultaneous delivery of the three pulses in a particulate form. In one embodiment, Pulse 1, Pulse 2 and Pulse 3 are combined to provide 45%, 30% and 25% of Pulse 1, Pulse 2, and Pulse 3, respectively.

Such combination of Pulses 1, 2 and 3 may be formulated into a sprinkle product; e.g., a twice-a-day product that contains 475 mg or 775 mg of amoxicillin. In another embodiment, Pulse 1, 2 and 3 may be combined into a once-a-day sprinkle product that contains 775 mg or 1250 mg or 1550 mg of amoxicillin. The sprinkle product may be sprinkled over applesauce, yogurt, or other soft food for administration. The product should not be chewed or crushed.

Numerous modification and variations of the present invention are possible in light of the above teachings and therefore within the scope of the appended claims the invention may be practiced otherwise than as particularly described. The present invention also extends to formulations which are bioequivalent to the pharmaceutical formulations of the present invention, in terms of both rate and extent of absorption, for instance as defined by the US Food and Drug Administration and discussed in the so-called “Orange Book” (Approved Drug Compositions with Therapeutic Equivalence Evaluations, US Dept of Health and Human Services, 19th edn, 1999).

Claims

1. A once-a-day amoxicillin antibiotic product comprising; first, second, and third amoxicillin antibiotic dosage forms, each of said amoxicillin antibiotic dosage forms comprising at least one amoxicillin antibiotic and a pharmaceutically acceptable carrier, said first amoxicillin antibiotic dosage form being, an immediate release dosage form, said second and third amoxicillin antibiotic dosage forms being delayed release: dosage forms, wherein said second amoxicillin antibiotic dosage form comprises amoxicillin coated with a methacrylic acid copolymer dispersion and said third amoxicillin antibiotic dosage form comprises amoxicillin coated with a first layer of a methacrylic acid copolymer dispersion and a second layer of hypromellose acetate succinate, and wherein each of said first, second, and third amoxicillin antibiotic dosage forms initiates release at different times, Cmax of the total amoxicillin antibiotic released from said amoxicillin antibiotic product is achieved in less that about 12 hours from administration; wherein said product contains the total dosage of amoxicillin, for a 24-hour dosing interval.

2. The product of claim 1, wherein said total dosage of amoxicillin is from about 775 mg to about 1550 mg.

3. The product of claim 1, wherein said first amoxicillin antibiotic dosage form comprises 10-90% of the product, wherein said second amoxicillin antibiotic dosage form comprises 10-90% of the product, and wherein said third amoxicillin antibiotic dosage form comprises 10-90% of the product.

4. The product of claim 3, wherein said first amoxicillin antibiotic dosage form comprises 45% of the product, wherein said, second amoxicillin antibiotic dosage form comprises 30% of the, product, and wherein said third amoxicillin antibiotic dosage form comprises 25% of the product.

5. The product of claim 1, wherein when the product is administered to a patient or subject in need thereof, the product provides a concentration of amoxicillin in the serum at or above the MIC90 for an infecting bacterial pathogen for at least 5 hours within a 24-hour dosing interval.

6. The product of claim 1, wherein said second and third amoxicillin antibiotic dosage forms further comprise microcrystalline cellulose, povidone, and polyoxyl 35 castor oil.

7. The product of claim 1, wherein amoxicillin is the only antibiotic present in the first, second, and third amoxicillin antibiotic dosage forms.