Multilayered tablet containing pravastatin and aspirin and method

FIELD OF THE INVENTION

[0001] The present invention relates to a pharmaceutical composition in the form of a tablet having three or more layers which includes aspirin in one layer and pravastatin in a second layer, which layers are separated from each other by at least one middle barrier layer, in a manner to minimize interaction of aspirin with the statin, for use in lowering cholesterol and reducing risk of a myocardial infarction, and to a method for lowering cholesterol and reducing risk of a myocardial infarction employing such composition.

BACKGROUND OF THE INVENTION

[0002] The use of aspirin for reducing the risk of a myocardial infarction and the use of statins for lowering cholesterol and preventing or treating atherosclerosis and cardiovascular disease and cerebrovascular disease are well documented. In fact, it is not uncommon that patients having elevated cholesterol levels who are at high risk for a myocardial infarction take both a statin and aspirin. However, use of both a statin and aspirin may require special care to insure that drug interaction, including physical and chemical incompatibility, and side effects, are kept to a minimum while achieving maximum benefit from these drugs.

[0003] With regard to possible physical drug interaction, aspirin is an acid, while some of the statins, such as pravastatin, atorvastatin and cerivastatin, are alkali salts. Thus, mixing of such statins (alkali salts) with aspirin could result in aspirin hydrolysis as well as statin degradation. Pravastatin is an acid labile compound. When pravastatin and aspirin are combined, the aspirin could cause pravastatin degradation which could result in reduced bioavailability of pravastatin.

[0004] Aspirin is known for causing gastrointestinal irritation and possibly bleeding when used for long-term therapy. It is therefore desirable in long-term aspirin therapy that the aspirin be provided in a form which minimizes side effects, for example a buffered aspirin formulation.

[0005] In view of the above, it is seen that there is a long-felt want in patients required to take both a statin and aspirin for a statin-aspirin formulation which provides for maximum cholesterol lowering and reduction of risk of a myocardial infarction without the undesirable side effects and drug interaction normally associated with use of such combination.

[0006] U.S. Pat. No. 6,235,311 to Ullah et al. discloses a bilayered tablet which includes aspirin in a first layer and a statin in a second layer, which tablet is formulated to minimize interaction between aspirin and the statin. The layer containing the statin includes one or more buffering agents to inhibit undesirable statin/aspirin interaction.

[0007] WO94/06416 discloses a three-layered tablet which includes an outer immediate release layer, an outer slow release layer, and a middle barrier layer, which may contain a buffer, which separates the immediate release layer from the slow release layer. Among the drugs which may be present in the tablets are non-steroidal anti-inflammatory agents.

[0008] U.S. Pat. No. 4,590,183 to Bailey discloses a multi-layered tablet which contains aspirin and sodium thiosulfate which may be separated from each other by an inert barrier.

DESCRIPTION OF THE INVENTION

[0009] In accordance with the present invention, a pharmaceutical composition is provided which is preferably in the form of a tablet containing pravastatin and aspirin formulated to reduce and/or inhibit pravastatin:aspirin interaction. The tablet of the invention is preferably in the form of a sandwich structure which includes one layer containing aspirin, another layer containing pravastatin, and one or more intermediate or middle barrier layers or other functional layers which separate the aspirin and pravastatin layers and minimizes interaction between the ingredients in these layers; one or more of these layers may optionally contain active ingredients such as a buffering agent which will help reduce the gastric irritation aspirin could cause. Optionally, the tablet may include an aspirin layer and a pravastatin layer separated by an intermediate or middle barrier layer with an additional layer or layers applied to the outer face of the pravastatin layer, the aspirin layer or both. These additional layers can be for aesthetic purposes, to disguise the taste of the drug substances, and/or to provide for delivery of additional active materials, such as buffers or other ingredients such as niacin, which are often co-administered with statins.

[0010] The tablet of the invention provides for maximum patient benefits including maximum cholesterol lowering and reduced risk of a myocardial infarction with minimal physical and chemical incompatibility (including minimal pravastatin:aspirin interaction), and reduced side effects normally associated with use of such drugs.

[0011] In addition, in accordance with the present invention, a method is provided for lowering serum cholesterol, preventing or inhibiting or treating atherosclerosis, and/or reducing risk of or treating a cardiovascular event or disease including coronary artery disease and cerebrovascular disease, wherein a pharmaceutical composition containing a combination of pravastatin and aspirin in a single dosage form, as described above, in a manner so as to minimize interaction of the pravastatin and aspirin, is administered to a patient in need of treatment.

[0012] Preferred pharmaceutical compositions of the present invention may take the form of several different embodiments. Thus, in one embodiment of the present invention, a pharmaceutical composition is provided as a trilayered sandwich structure wherein the pravastatin and aspirin are formulated together in a single tablet. The tablet of the invention is preferably in the form of a trilayered tablet which includes a first layer, a second layer in the form of a middle barrier layer and a third layer. Aspirin, in the form of granules or crystals of a defined size will be present in the first layer together with optional excipients as described hereinafter, while the pravastatin will be present in the third layer. The middle barrier layer optionally, but preferably, includes one or more buffering agents (as necessary to reduce, inhibit or prevent undesirable statin/aspirin interaction) and optionally one or more excipients as described hereinafter.

[0013] In addition, the trilayered tablet of the invention may include an outer protective coating or finishing layer covering the first layer and/or third layer as described hereinafter.

[0014] In addition, in accordance with the present invention, a pharmaceutical composition is provided which is in the form of a trilayered tablet as described above which includes in one outer layer aspirin granules having an enteric coating to provide maximum efficacy while minimizing side effects resulting from prolonged aspirin therapy.

[0015] Another embodiment of the pharmaceutical composition of the invention includes granules of enteric coated aspirin in the first layer and enteric coated pravastatin in the third layer.

[0016] The tablets containing the enteric coated granules of aspirin and statin may also include an outer protective coating or finishing layer.

DETAILED DESCRIPTION OF THE INVENTION

[0017] The pharmaceutical composition of the invention which includes a combination of pravastatin and aspirin is effective in preventing, reducing and/or treating elevated cholesterol levels (such as in hypercholesterolemia), atherosclerosis, cardiovascular events and disease including coronary events and cerebrovascular events, and coronary artery disease and/or cerebrovascular disease.

[0018] The terms “cardiovascular event(s)” and “cardiovascular disease” as employed herein refer to coronary and/or cerebrovascular event(s) and disease including primary myocardial infarction, secondary myocardial infarction, myocardial ischemia, angina pectoris (including unstable angina), congestive heart failure, sudden cardiac death, cerebral infarction, cerebral thrombosis, cerebral ischemia, transient ischemic attack and the like.

[0019] The term “coronary artery disease” (CAD) as employed herein refers to diseases including atherosclerosis of the coronary arteries, previous myocardial infarction, ischemia, angina pectoris and/or heart failure.

[0020] The term “cerebrovascular disease” as employed herein refers to diseases including atherosclerosis of the intracranial and/or extracranial arteries, cerebral infarction, cerebral thrombosis, cerebral ischemia, stroke, and/or transient ischemic attacks.

[0021] The term “pravastatin” as employed herein refers to pravastatin, pravastatin sodium, other pravastatin salts, and all forms of pravastatin including the dihydroxy acid form and the lactone form.

[0022] Aspirin will preferably be employed in the form of acetylsalicylic acid also referred to as salicylic acid acetate, or its salts, esters or complexes.

[0023] The pharmaceutical composition of the invention in the form of a tablet will include aspirin in amounts from about 10 to about 800 mg, preferably from about 25 to about 650 mg, most preferably from about 50 to about 325 mg.

[0024] The aspirin for use in forming the pharmaceutical composition of the invention will preferably be in the form of granules having an average particle size within the range from about 10 microns to about 2 mm, more preferably from about 50 microns to about 1.0 mm.

[0025] The pharmaceutical composition of the invention will contain pravastatin in an amount as normally employed as exemplified in the 56th Edition of the Physician's Desk Reference (PDR) (2002). Thus, pravastatin may be employed in amounts within the range from about 0.1 mg to 2000 mg per day in single or divided doses, and preferably from about 0.2 to about 200 mg per day, and most preferably, a daily dosage of 10 to 160 mg may be employed in single or divided doses.

[0026] In forming the pharmaceutical composition of the invention in the form of a trilayered tablet, the first layer containing aspirin will optionally, but preferably, include bulking agents such as lactose, microcrystalline cellulose, wood cellulose, corn starch, modified corn starch, calcium phosphate, sugar, dextrose, mannitol, sorbitol or mixtures of two or more thereof. The bulking agent will be present in an amount from about 1 to about 90%, preferably from about 5 to about 85% by weight of the first layer containing aspirin.

[0027] The first layer may also optionally include a tabletting lubricant, such as zinc stearate, magnesium stearate, calcium stearate, talc, carnauba wax, stearic acid, palmitic acid or hydrogenated vegetable oils and fats, in an amount within the range from about 0.1 to about 4%, and preferably 0.2 to about 2% by weight of the first layer. The aspirin layer may also optionally include a disintegrant such as corn starch, potato starch, pre-gelatinised starch, crospovidone, croscarmellose sodium or sodium starch glycollate in an amount within the range from about 0.5 to about 20% by weight of the layer, and preferably from about 1 to about 10% by weight of the layer.

[0028] The third layer of the trilayered tablet containing pravastatin cholesterol lowering agent will optionally include a bulking agent such as lactose, microcrystalline cellulose, modified corn starch, calcium phosphate or other bulking agent as set out above for the first layer, in an amount within the range from about 1 to about 90%, preferably from about 5 to about 85% by weight of the third layer. In addition, the third layer may optionally include a binder such as corn starch, pregelatinized starch, polyvinyl pyrrolidone (PVP), hydroxypropylmethyl cellulose (HPMC), ethyl cellulose, cellulose acetate and the like, in an amount within the range from about 0.5 to about 20%, preferably from about 1 to about 10% by weight of the third layer, a disintegrating agent, such as croscarmellose sodium, crospovidone, pre-gelatinised starch, corn starch or sodium starch glycollate in an amount within the range from about 0.5 to about 20% by weight, preferably from about 1 to about 15% by weight of the third layer, and a tabletting lubricant such as magnesium stearate, zinc stearate, or other lubricant as set out above with respect to the first layer in an amount from about 0.1 to about 4%, preferably from about 0.2 to about 2% by weight of the third layer.

[0029] The third layer containing pravastatin may also optionally include one or more buffering agents which include conventional acid buffers such as calcium carbonate, magnesium oxide, magnesium carbonate, magnesium hydroxide, aluminum hydroxide, dihydroxyaluminum sodium carbonate, aluminum magnesium hydroxide sulfate or aluminum hydroxide magnesium carbonate co-dried gel, or any of the acid buffers set out for use in the middle barrier layer, or mixtures of one or more thereof, in amounts as needed to insure that the aspirin will be sufficiently buffered to inhibit GI side effects. Thus, amounts of buffering agent within the range from about 10 to about 800 mg, preferably from about 70 to about 300 mg will be employed depending upon the amount of aspirin present in the first layer.

[0030] The middle or barrier layer will optionally include a bulking agent such as any of the bulking agents set out above for use in the first (aspirin) layer or third (pravastatin) layer, such as microcrystalline cellulose, corn starch, lactose, and the like, in an amount within the range from about 0 to about 90%, preferably from about 5 to about 85% based on the weight of the middle barrier layer; a disintegrating agent such as any of the disintegrating agents set out above with respect to the third (pravastatin) layer in an amount with the range from about 0.5 to about 20%, preferably from about 1 to about 15% by weight of the middle barrier layer; a tabletting lubricant, such as any of the tabletting lubricants set out above with respect to the first layer and the third layer, in an amount within the range from about 0.1 to about 4%, preferably from about 0.2 to about 2% by weight of the middle barrier layer.

[0031] The middle barrier layer may optionally, but preferably, include a buffering agent in an amount sufficient to reduce gastric irritation that can be caused by aspirin and insure that the aspirin will be sufficiently buffered to minimize interaction between the aspirin and pravastatin. Thus, amounts of buffering agent within the range from about 10 to about 800 mg, preferably from about 70 to about 300 mg, depending upon the amount of aspirin present in the first layer.

[0032] Examples of buffering agent suitable for use in the middle barrier layer include calcium carbonate, magnesium oxide, magnesium carbonate, magnesium hydroxide, calcium hydroxide, sodium phosphate, aluminum hydroxide, dihydroxyaluminum sodium carbonate, sodium carbonate, sodium bicarbonate, aluminum magnesium hydroxide sulfate or aluminum hydroxide, magnesium carbonate co-dried gel, sodium acetate, sodium citrate, sodium tartrate, sodium fumarate, sodium malate, sodium succinate, aluminum oxide, or mixtures of two or more thereof.

[0033] Preferred trilayered tablet formulations of the invention are set out below.

[0034] I. One to three trilayered tablet(s) containing pravastatin-aspirin where the middle barrier layer includes one or more buffering agents (Total Tablet(s) Weight=350 to 4000 mg)

1Weight %Amount per(based on eachOne to ThreeIngredientseparate layer)Tablet(s) (mg)First Layer containing AspirinAspirin18 to 90 50 to 325Bulking Agents 5 to 85 5 to 1100Optional Disintegrants 0 to 10 0 to 50Binders 0 to 50 0 to 250Lubricants0.2 to 10 0.18 to 50 Other Excipients 0 to 10 0 to 50Total Weight of First Layer100% 90 to 2000 mgMiddle Barrier Layercontaining Buffering AgentsBuffering Agents10 to 90 70 to 315Bulking Agents 5 to 85 7.5 to 298 Binders 0 to 10 0 to 35Lubricants 0.2 to 20.12 to 7.5 Other Excipients 0 to 10 0 to 35Total Weight of100% 60 to 700 mgMiddle Barrier LayerThird Layer containing PravastatinPravastatin Sodium 5 to 40 10 to 160Bulking Agents 5 to 85 10 to 340Binders 1 to 10 2 to 40Disintegrating Agents 1 to 15 2 to 60Buffering Agents35 to 75 70 to 300Lubricants0.2 to 2 0.4 to 8 Other Excipients 0 to 10 0 to 40Total Weight of Third Layer100% 200 to 1100 mg

[0035] II. One to three trilayered tablet(s) containing pravastatin-aspirin in a formulation where the middle barrier layer does not include a buffering agent (total tablet(s) weight=350 to 4000 mg)

2Weight %Amount per(based on eachOne to ThreeIngredientseparate layer)Tablet(s) (mg)First Layer containing AspirinAspirin18 to 90 50 to 325Bulking Agents 5 to 85 5 to 1100Optional Binders 0 to 25 0 to 250Lubricants0.1 to 2 0.6 to 9 Other Excipients 0 to 10 0 to 50Total Weight of First Layer100% 90 to 500 mgMiddle Barrier Layer(No Buffering Agents)Bulking Agents 5 to 85 3 to 255Disintegrating Agents 0 to 10 0 to 30Lubricants0.2 to 2 0.2 to 6 Other Excipients 0 to 10 0 to 30Total Weight of100% 60 to 350 mgMiddle Barrier LayerThird Layer containing PravastatinPravastatin Sodium 5 to 33 10 to 200Bulking Agents 5 to 85 10 to 700Binders0.2 to 4 0.4 to 9 Disintegrating Agents0.5 to 15 2 to 60Buffering Agents35 to 75 70 to 450Lubricants0.2 to 2 0.4 to 12 Other Excipients 0 to 10 0 to 60Total Weight of Third Layer100% 200 to 1100 mg

[0036] Specific preferred trilayered tablet formulations of the invention are set out below.

[0037] I. One to three trilayered tablet(s) containing pravastatin-aspirin where the middle barrier layer includes one or more buffering agents.

3Weight %Amount per(based on eachOne to ThreeIngredientseparate layer)Tablet(s) (mg)First Layer containing AspirinAspirin 18 to 90 50 to 325 {close oversize brace} granulesStarch 5 to 85 5 to 380 {open oversize brace} Lactose 0 to 75 0 to 375Microcrystalline Cellulose 0 to 50 0 to 250Optional Croscarmellose Sodium 0 to 10 0 to 50Magnesium or Zinc Stearate0.2 to 100.18 to 50Other Excipients 0 to 10 0 to 50Total Weight of First Layer100% 90 to 2000 mgMiddle Barrier LayerTribuffer Alkaline Granules 30 to 90 18 to 300(calcium carbonate 30 to 70)(magnesium carbonate 5 to 20)(magnesium oxide 10 to 30)(sodium phosphate monobasic 1 to 3)(cornstarch 5 to 20)(citric acid 1 to 3)Optional Microcrystalline Cellulose 0 to 30 0 to 90Magnesium or Zinc Stearate0.2 to 20.12 to 7.5Other Excipients 0 to 10 0 to 35Total Weight of100% 60 to 700 mgMiddle Barrier LayerThird Layer containing PravastatinPravastatin Sodium 5 to 50 10 to 200Lactose 20 to 25 8 to 450Microcrystalline Cellulose 10 to 30 20 to 180Povidone0.2 to 1.5 0.4 to 9Magnesium Oxide 35 to 75 70 to 450Croscarmellose Sodium 2 to 7 8 to 42Magnesium or Zinc Stearate0.2 to 2 0.4 to 12Other Excipients 0 to 10 0 to 60Total Weight of Third Layer100% 200 to 1100 mgTotal weight of tablet 350 to 4000 mg

[0038] II. One to three trilayered tablet(s) containing pravastatin-aspirin in a formulation where the middle barrier layer does not include a buffering agent.

4Weight %Amount per(based on eachOne to ThreeIngredientseparate layer)Tablet(s) (mg)First Layer containing AspirinAspirin18 to 9050 to 325 {close oversize brace} granulesStarch5 to 855 to 380Lactose0 to 750 to 375Microcrystalline Cellulose0 to 250 to 250Magnesium or Zinc Stearate0.1 to 21 to 4Other Excipients0 to 100 to 50Total Weight of First Layer100%90 to 1400 mgMiddle Barrier LayerLactose5 to 853 to 255Sodium Croscarmellose0 to 100 to 30Magnesium or Zinc Stearate0.2 to 20.2 to 6Other Excipients0 to 100 to 30Total Weight of100%60 to 300 mgMiddle Barrier LayerThird Layer containing PravastatinPravastatin Sodium5 to 3310 to 200Lactose20 to 8540 to 450Microcrystalline Cellulose10 to 3020 to 180Povidone0.2 to 1.50.4 to 9Magnesium Oxide35 to 7570 to 450Croscarmellose Sodium4 to 78 to 42Magnesium or Zinc Stearate0.2 to 20.4 to 12Other Excipients0 to 100 to 60Total Weight of Third Layer100%200 to 1400 mgTotal weight of tablet350 to 4000 mg

[0039] In forming a trilayered tablet of the invention, the first layer containing aspirin, the third layer containing pravastatin and the middle barrier layer may each be prepared by conventional wet granulation, dry granulation (compaction) or dry blending techniques.

[0040] The first, middle and third layers may then be compressed and combined to form a trilayered tablet employing conventional trilayer tabletting equipment.

[0041] Other conventional ingredients which may optionally be present in any of the three layers include preservatives, stabilizers, anti-adherents or silica flow conditioners or glidants, such as Syloid brand silicon dioxide as well as antioxidants such as Vitamin E, Vitamin C, and folic acid, Vitamin B6 and Vitamin B12.

[0042] The trilayer tablet of the invention may also include an outer protective coating layer which may include up to about 15% by weight of the trilayer tablet. The outer protective coating layer which is applied over the trilayered tablet may comprise any conventional coating formulations and will include one or more film-formers, such as a hydrophilic polymer like hydroxypropylmethyl cellulose (HPMC) and a hydrophobic polymer like ethyl cellulose, cellulose acetate, polyvinyl alcohol-maleic anhydride copolymers, acrylic copolymers, β-pinene polymers, glyceryl esters of wood resins and the like, and one or more plasticizers, such as polyethylene glycol, triethyl citrate, diethyl phthalate, propylene glycol, glycerin, butyl phthalate, castor oil and the like.

[0043] The film formers are applied from a solvent system containing one or more solvents including water, alcohols like methyl alcohol, ethyl alcohol or isopropyl alcohol, ketones like acetone, or ethylmethyl ketone, chlorinated hydrocarbons like methylene chloride, dichloroethane, and 1,1,1-trichloroethane.

[0044] Another embodiment of the pharmaceutical composition of the invention is formed of trilayered tablets containing enteric coated aspirin granules in the first layer.

[0045] The aspirin granules can be coated with conventional enteric polymers coatings in aqueous or non-aqueous systems. For example, Eudragit L-30D-55 (acrylic acid copolymers-Rohm Pharma) (5 to 25% solids) containing 10 to 15% of diethylphthlate (w/w) as plasticizer can be used in an aqueous system.

[0046] Other conventional enteric polymer coating systems may be employed such as Eudragit R and S series resins, (acrylic acid copolymers-Rohm Pharma), cellulose acetate phthalate, cellulose acetate maleate, cellulose acetate succinate, hydroxypropylmethyl cellulose phthalate, hydroxypropylmethylcellulose acetate succinate, and the like, and a suitable plasticizer such as triethyl citrate, diethyl phthalate, tributyl citrate, triacetin, dibutyl phthalate, dibutyl sebicate, Myvacet 940, and other commonly used plasticizers as may be suitable for particular enteric polymers can be used. It will be appreciated that any polymer with suitable plasticizer can be used in aqueous or non-aqueous system to form an enteric coating on the aspirin granule or particle.

[0047] In another embodiment of the pharmaceutical composition of the invention, the enteric coated aspirin granules described above may be further coated with an outer protective finishing coat or layer as described hereinbefore.

[0048] The double coated aspirin granules can be tableted as described above.

[0049] In yet another embodiment of the pharmaceutical composition of the invention, aspirin is enteric coated as described above and the pravastatin can optionally be enteric coated. Pravastatin can be coated in the form of pure drug or after spheronization or agglomeration. The particles for coating do not need to be perfectly spherical. These could be rods or irregular particles.

[0050] In carrying out the method of the present invention, the pharmaceutical composition of the invention containing the combination of the pravastatin and aspirin may be administered to mammalian species, such as monkeys, dogs, cats, rats, humans, etc., and, as described hereinbefore, may be incorporated in a trilayered tablet. The above dosage forms will also include the necessary carrier material, excipient, lubricant, buffer, antibacterial, bulking agent (such as mannitol), anti-oxidants such as Vitamin C and Vitamin E, as well as Vitamin B6, Vitamin B12, folic acid, sodium bisulfite, and the like.

[0051] The dose administered must be adjusted according to age, weight and condition of the patient, as well as the route of administration, dosage form and regimen and the desired result.

[0052] The compositions described above may be administered in the dosage forms as described above in single or divided doses of one to four times daily. It may be advisable to start a patient on a low dose combination and work up gradually to a high dose combination.

[0053] Tablets of various sizes can be prepared, e.g., up to about 1500 mg in total weight, containing the active substances in the ranges described above. These tablets can, of course, be scored to provide for fractional doses in some cases.

[0054] Some of the active substances described above form commonly known, pharmaceutically acceptable salts such as alkali metal and other common basic salts or acid addition salts, etc. References to the base substances are therefore intended to include those common salts known to be substantially equivalent to the parent compound.

[0055] The formulations as described above will be administered for a prolonged period, that is, for as long as the potential for cardiovascular events and disease including coronary artery disease and/or cerebrovascular disease remains or the symptoms continue. Sustained release forms of such formulations which may provide such amounts daily, biweekly, weekly, monthly and the like may also be employed. A dosing period of at least 10 days are required to achieve minimal benefit.

EXAMPLES

[0056] The following Examples represent preferred embodiments of the present invention.

[0057] Formulations suitable for oral administration are prepared as described below.

Example 1

[0058] A trilayered tablet containing 81 mg aspirin in a first outer layer and 40 mg pravastatin sodium in a second outer layer with a buffered intermediate layer may be prepared as follows.

5IngredientAmount per tablet (mg)Pravastatin sodium 40.00Lactose monohydrate259.80Microcrystalline cellulose 60.20Povidone 4.00Magnesium oxide, heavy 13.20Croscarmellose sodium 20.00Ferric oxide yellow 0.80Zinc stearate 2.00Purified waterq.s.1Total first layer400.00Tribuffer alkaline granules2 75.00Microcrystalline cellulose124.00Zinc stearate 1.00Total second (intermediate) layer200.00Aspirin 10% starch granules3 90.00 (81 mg aspirin)Microcrystalline cellulose 48.00Lactose160.50Zinc stearate 1.50Total third layer300.00Total tablet weight900.001The purified water in the first layer in Example 1 (as well as in Examples 2 to 6 and 8 to 10) is used for wet granulation and removed during drying. 2The tribuffer alkaline granules used in the Example 1 formulation and in Examples 2 to 9 has the following composition: calcium carbonate 52.63% w/w, magnesium oxide heavy 21.05% w/w, magnesium carbonate 13.16% w/w, monobasic sodium phosphate 1.32% w/w, cornstarch 10.52% w/w, citric acid 1.32% w/w. 3The aspirin 10% starch granules used in the Example 1 formulation and in Examples 2 to 10 is obtained from Rhodia, Cranbury NJ, USA.

[0059] A wet granulation process is used to prepare pravastatin granules, dissolving the pravastatin sodium and the povidone in purified water and using this solution to granulate the mixture of the other first layer ingredients except for the zinc stearate. The granules are dried, sieved and lubricated by mixing with the zinc stearate.

[0060] The second, intermediate layer components are mixed together dry in a suitable tumble blender.

[0061] The aspirin layer components, except for zinc stearate, are combined by mixing in a suitable tumble blender. The zinc stearate is then added to this mixture and mixing continued to lubricate the blend.

[0062] The three layer tablets are prepared by having the granules of powder mixes for each layer in separate hoppers on a tablet press designed for the manufacture of layered tablets. Operating the tablet press results in triple layers tablets containing 81 mg of aspirin and 40 mg of pravastatin sodium possessing an intermediate layer containing alkaline earth buffers.

Example 2

[0063] A trilayered tablet containing 325 mg aspirin in a first outer layer and 40 mg pravastatin sodium in a second outer layer and an intermediate layer containing buffering agents may be prepared as follows.

6IngredientAmount per tablet (mg)Pravastatin sodium 40.00Lactose monohydrate259.80Microcrystalline cellulose 60.20Povidone 4.00Magnesium oxide, heavy 13.20Croscarmellose sodium 20.00Iron oxide red 0.80Zinc stearate 2.00Purified water1q.s.Total first layer400.00Tribuffer alkaline granules2199.00Zinc stearate 1.00Total second, intermediate layer200.00Aspirin 10% starch granules3361.10 (325 mg aspirin)Zinc stearate 0.90Total third layer362.00Total tablet weight962.00

[0064] The components of the three layers are processed as per example 1 and the granules transferred to a rotary tablet press designed for making layered tablets which is operated to yield tablets containing 325 mg of aspirin and 40 mg of pravastatin sodium with an intermediate layer containing alkaline earth buffers.

Example 3

[0065] A trilayered tablet containing 81 mg aspirin in a first outer layer and 80 mg pravastatin sodium in a second outer layer with a buffered intermediate layer may be prepared as follows.

7IngredientAmount per tablet (mg)Pravastatin sodium 80.00Lactose monohydrate211.80Microcrystalline cellulose 60.20Povidone 4.00Magnesium oxide, heavy 28.00Croscarmellose sodium 20.00Blue #2 aluminum lake 11-14% 0.80Zinc stearate 2.00Purified waterq.s.1Total first layer406.80Tribuffer alkaline granules2 75.00Microcrystalline cellulose124.00Zinc stearate 1.00Total second (intermediate) layer200.00Aspirin 10% starch granules3 90.00 (81 mg aspirin)Microcrystalline cellulose 48.00Lactose160.50Zinc stearate 1.50Total third layer300.00Total tablet weight906.80

[0066] A wet granulation process is used to prepare pravastatin granules, dissolving the pravastatin sodium and the povidone in purified water and using this solution to granulate the mixture of the other first layer ingredients except for the zinc stearate. The granules are dried, sieved and lubricated by mixing with the zinc stearate.

[0067] The second, intermediate layer components are mixed together dry in a suitable tumble blender.

[0068] The aspirin layer components, except for zinc stearate, are combined by mixing in a suitable tumble blender. The zinc stearate is then added to this mixture and mixing continued to lubricate the blend.

[0069] The three layer tablets are prepared by having the granules of powder mixes for each layer in separate hoppers on a tablet press designed for the manufacture of layered tablets. Operating the tablet press results in triple layers tablets containing 81 mg of aspirin and 80 mg of pravastatin sodium possessing an intermediate layer containing alkaline earth buffers.

Example 4

[0070] A trilayered tablet containing 325 mg aspirin in a first outer layer and 80 mg pravastatin sodium in a second outer layer and an intermediate layer containing buffering agents may be prepared as follows.

8IngredientAmount per tablet (mg)Pravastatin sodium 80.00Lactose monohydrate212.60Microcrystalline cellulose 60.20Povidone 4.00Magnesium oxide, heavy 28.00Croscarmellose sodium 20.00Zinc stearate 2.00Purified water1q.s.Total first layer406.80Tribuffer alkaline granules2199.00Zinc stearate 1.00Total second, intermediate layer200.00Aspirin 10% starch granules3361.10 (325 mg aspirin)Zinc stearate 0.90Total third layer362.00Total tablet weight968.80

[0071] The components of the three layers are processed as per Example 1 and the granules transferred to a rotary tablet press designed for making layered tablets which is operated to yield tablets containing 325 mg of aspirin and 80 mg of pravastatin sodium with an intermediate layer containing alkaline earth buffers.

Example 5

[0072] A trilayered tablet containing 81 mg aspirin in a first outer layer and 40 mg pravastatin sodium in a second outer layer and an intermediate layer containing alkaline earth buffering agents may be prepared as follows.

9IngredientAmount per tablet (mg)Pravastatin sodium 40.00Lactose monohydrate263.00Microcrystalline cellulose 60.70Povidone 4.00Magnesium oxide, heavy 13.30Croscarmellose sodium 20.20Ferric oxide yellow 0.80Zinc stearate 3.00Purified waterq.s.1Total first layer405.00Tribuffer alkaline granules2199.00Magnesium stearate 1.00Total second (intermediate) layer200.00Aspirin 10% starch granules3 90.08 (81 mg aspirin)Croscarmellose sodium 8.85Lactose193.86Zinc stearate 2.21Total third layer295.00Total tablet weight900.00

[0073] The components of the three layers are processed as per example 1 and the granules transferred to a rotary tablet press designed for making layered tablets which is operated to yield tablets containing 81 mg of aspirin and 80 mg of pravastatin sodium with an intermediate layer containing alkaline earth buffers.

Example 6

[0074] A trilayered tablet containing 81 mg aspirin in a first outer layer and 40 mg pravastatin sodium in a second outer layer and an intermediate layer containing alkaline earth buffering agents may be prepared as follows.

10IngredientAmount per tablet (mg)Pravastatin sodium 40.00Lactose monohydrate259.80Microcrystalline cellulose 60.20Povidone 4.00Magnesium oxide, heavy 13.20Croscarmellose sodium 20.00Ferric oxide yellow 0.80Zinc stearate 2.00Purified waterq.s.1Total first layer400.00Tribuffer alkaline granules2198.84Brown dye PB-1596 0.16Magnesium stearate 1.00Total second (intermediate) layer200.00Aspirin 10% starch granules3 89.55 (81 mg aspirin)Lactose Fast-Flo160.95Microcrystalline cellulose 48.00Zinc stearate 1.50Total third layer300.00Total tablet weight900.00

[0075] A wet granulation process is used to prepare pravastatin granules; the pravastatin sodium and the povidone are dissolved in purified water and this solution is used to granulate the mixture of the other first layer ingredients except for the zinc stearate. The granules are dried, sieved and lubricated by mixing with the zinc stearate.

[0076] The second, intermediate layer components are mixed together dry in a suitable tumble blender.

[0077] The aspirin layer components, except for zinc stearate, are combined by mixing in a suitable tumble blender. The zinc stearate is then added to this mixture and mixing continued to lubricate the blend.

[0078] The triple layer tablets are prepared by having the granules of powder mixes for each layer in separate hoppers on a tablet press designed for the manufacture of layered tablets. Operating the tablet press results in triple layers tablets containing 81 mg of aspirin and 40 mg of pravastatin sodium possessing an intermediate layer containing alkaline earth buffers.

Example 7

[0079] A trilayered tablet containing 81 mg aspirin in a first outer layer and 40 mg pravastatin sodium in a second outer layer and an intermediate layer containing alkaline earth buffering agents may be prepared as follows.

11IngredientAmount per tablet (mg)Pravastatin sodium 40.00Lactose monohydrate259.80Microcrystalline cellulose 60.20Povidone 4.00Magnesium oxide, heavy 13.20Croscarmellose sodium 20.00Ferric oxide yellow 0.80Zinc stearate 2.00Total first layer400.00Tribuffer alkaline granules1198.84Brown dye PB-1596 0.16Magnesium stearate 1.00Total second (intermediate) layer200.00Aspirin 10% starch granules3 89.55 (81 mg aspirin)Lactose Fast-Flo160.95Microcrystalline cellulose 48.00Zinc stearate 1.50Total third layer300.00Total tablet weight900.00

[0080] A direct compression process is used to prepare the pravastatin layer by blending the pravastatin sodium and the other first layer ingredients except for the zinc stearate in a suitable mixer until uniform. This powder blend is then lubricated by further mixing with the zinc stearate.

[0081] The second, intermediate layer components are mixed together dry in a suitable tumble blender.

[0082] The aspirin layer components, except for zinc stearate, are combined by mixing in a suitable tumble blender. The zinc stearate is then added to this mixture and mixing continued to lubricate the blend.

[0083] The triple layer tablets are prepared by having the granules of powder mixes for each layer in separate hoppers on a tablet press designed for the manufacture of layered tablets. Operating the tablet press results in triple layered tablets containing 81 mg of aspirin and 40 mg of pravastatin sodium possessing an intermediate layer containing alkaline earth buffers.

Example 8

[0084] A trilayered tablet containing 81 mg aspirin in a first outer layer and 20 mg pravastatin sodium in a second outer layer (made by a wet granulation process) and an intermediate layer containing alkaline earth buffering agents may be prepared as follows.

12IngredientAmount per tablet (mg)Pravastatin sodium 20.00Lactose monohydrate129.60Microcrystalline cellulose 30.10Povidone 2.00Magnesium oxide, heavy 6.60Croscarmellose sodium 10.00Ferric oxide yellow 0.40Zinc stearate 1.00Purified waterq.s.1Total first layer200.00Tribuffer alkaline granules2 75.00Microcrystalline cellulose124.00Zinc stearate 1.00Total second (intermediate) layer200.00Aspirin 10% starch granules3 90.00 (81 mg aspirin)Lactose Fast-Flo160.50Microcrystalline cellulose 48.00Zinc stearate 1.50Total third layer300.00Total tablet weight700.00

[0085] A wet granulation process is used to prepare pravastatin granules, dissolving the pravastatin sodium and the povidone in purified water and using this solution to granulate the mixture of the other first layer ingredients except for the zinc stearate. The granules are dried, sieved and lubricated by mixing with the zinc stearate.

[0086] The second, intermediate layer components are mixed together dry in a suitable tumble blender.

[0087] The aspirin layer components, except for zinc stearate, are combined by mixing in a suitable tumble blender. The zinc stearate is then added to this mixture and mixing continued to lubricate the blend.

[0088] The triple layer tablets are prepared by having the granules of powder mixes for each layer in separate hoppers on a tablet press designed for the manufacture of layered tablets. Operating the tablet press results in triple layers tablets containing 81 mg of aspirin and 20 mg of pravastatin sodium possessing an intermediate layer containing alkaline earth buffers

Example 9

[0089] A trilayered tablet containing 325 mg aspirin in a first outer layer and 20 mg pravastatin sodium in a second outer layer (made by a wet granulation process) and an intermediate layer containing alkaline earth buffering agents may be prepared as follows.

13IngredientAmount per tablet (mg)Pravastatin sodium 20.00Lactose monohydrate129.00Microcrystalline cellulose 30.10Povidone 2.00Magnesium oxide, heavy 6.60Croscarmellose sodium 10.00Ferric oxide red 0.40Zinc stearate 1.00Purified waterq.s.1Total first layer200.00Tribuffer alkaline granules2199.00Zinc stearate 1.00Total second (intermediate) layer200.00Aspirin 10% starch granules3361.10 (325 mg aspirin)Zinc stearate 1.50Total third layer362.00Total tablet weight762.00

[0090] A wet granulation process is used to prepare pravastatin granules, dissolving the pravastatin sodium and the povidone in purified water and using this solution to granulate the mixture of the other first layer ingredients except for the zinc stearate. The granules are dried, sieved and lubricated by mixing with the zinc stearate.

[0091] The second, intermediate layer components are mixed together dry in a suitable tumble blender.

[0092] The aspirin layer components, except for zinc stearate, are combined by mixing in a suitable tumble blender. The zinc stearate is then added to this mixture and mixing continued to lubricate the blend.

[0093] The triple layer tablets are prepared by having the granules of powder mixes for each layer in separate hoppers on a tablet press designed for the manufacture of triple layered tablets. Operating the tablet press results in triple layers tablets containing 81 mg of aspirin and 20 mg of pravastatin sodium possessing an intermediate layer containing alkaline earth buffers.

Example 10

[0094] A trilayered tablet containing 81 mg of aspirin in the first outer layer and 40 mg pravastatin sodium in a second outer layer and a non-buffered intermediate layer may be prepared as follows:

14IngredientAmount per tablet (mg)Pravastatin sodium 40.00Lactose monohydrate259.80Microcrystalline cellulose 60.20Povidone 4.00Magnesium oxide, heavy 13.20Croscarmellose sodium 20.00Ferric oxide yellow 0.80Zinc stearate 2.00Purified waterq.s.1Total first layer400.00Lactose193.00Croscarmellose sodium 6.00Zinc stearate 1.00Total second (intermediate) layer200.00Aspirin 10% starch granules3 90.00 (81 mg aspirin)Microcrystalline cellulose 48.00Lactose160.50Zinc stearate 1.50Total third layer300.00Total tablet weight900.00

[0095] A wet granulation process is used to prepare pravastatin granules, dissolving the pravastatin sodium and the povidone in purified water and using this solution to granulate the mixture of the other first layer ingredients except for the zinc stearate. The granules are dried, sieved and lubricated by mixing with the zinc stearate.

[0096] The second, intermediate layer components are mixed together dry in a suitable tumble blender.

[0097] The aspirin layer components, except for zinc stearate, are combined by mixing in a suitable tumble blender. The zinc stearate is then added to this mixture and mixing continued to lubricate the blend.

[0098] The triple layer tablets are prepared by having the granules of powder mixes for each layer in separate hoppers on a tablet press designed for the manufacture of layered tablets. Operating the tablet press results in triple layers tablets containing 81 mg of aspirin and 40 mg of pravastatin sodium possessing an unbuffered intermediate layer.

Multilayered tablet containing pravastatin and aspirin and method

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