Patent Grant
11260026
This invention pertains to a ready to use, liquid, orally administered formulations containing 50 mg of diclofenac potassium with unexpected chemical stability and palatability.
Diclofenac potassium ([2-(2,6-dichlorophenyl)amino]benzeneacetate, potassium salt) is a potent NSAID (non-steroidal anti-inflammatory drug) used therapeutically for inflammatory conditions and pain management. The solubility of diclofenac potassium (pKa=3.9) is pH dependent. It is sparingly soluble at acidic pH, and the amount of the active substance dissolved in buffered solutions increases with the increasing pH of the dissolution aqueous medium. The stability of Diclofenac and its salts is well known in the solid state: Diclofenac acid and its salts are in fact characterized by a chemical stability when they are taken in their solid state. When dissolved in water, in contrast, the molecule could be expected to undergo fast and irreversible oxidative degradation according to the auto-oxidation pathway in
Diclofenac is sold in various dosage forms, including tablets (Cataflam®), powders for oral solution (Cambia®), gel-caps (Zipsor®), patches (Flector®), and gels (Voltaren®). Other dosage forms are described, inter alia, in WO 2006/133954 (Reiner et al.), WO 1997/044023 (Reiner et al.), and WO 2003/043600 (Reiner et al.). Given its wide spectrum of action and therapeutic benefit, additional dosage forms are needed for convenience of the patient and additional therapeutic uses.
The inventors have developed a liquid, single dose, ready to use formulation containing diclofenac potassium as a unique active ingredient with the aim of obtaining a palatable and a chemically and physically stable water based oral solution. The stability of this unique liquid dosage form has been demonstrated in different primary packaging and under different storage conditions by preliminary stability studies, which showed that the impurities content conforms to rigorous pharmaceutical specifications even under accelerated conditions intended to induce degradation.
Therefore, one embodiment the invention provides a ready to use diclofenac formulation comprising: (a) diclofenac or a pharmaceutically acceptable salt thereof; (b) an alkalizing agent imparting a pH of from about 7 to about 10 to the formulation, optionally comprising potassium or sodium bicarbonate; and (c) a sugar-based aqueous means for solubilizing and stabilizing said formulation; wherein the formulation is optionally a liquid.
In another embodiment the invention provides a liquid diclofenac formulation in a ready to use stick pack comprising: (a) a therapeutically effective amount of diclofenac or a pharmaceutically acceptable salt thereof; (b) an alkalizing agent imparting a pH of from about 7 to about 10 to the formulation, optionally comprising potassium or sodium bicarbonate; and (c) a sugar-based aqueous means for solubilizing and stabilizing said formulation.
In still another embodiment the invention provides a method of treating a condition selected from pain and migraine in a patient in need thereof comprising administering to said patient a therapeutically effective amount of any of the ready to use diclofenac formulations of the present invention, preferably one comprising: (a) diclofenac or a pharmaceutically acceptable salt thereof; (b) an alkalizing agent imparting a pH of from about 7 to about 10 to the formulation, optionally comprising potassium or sodium bicarbonate; and (c) a sugar-based aqueous means for solubilizing and stabilizing said formulation, wherein the formulation is optionally provided as a liquid formulation in a ready to use stick pack.
Additional advantages of the invention are set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
The accompanying drawing, which is incorporated in and constitutes a part of this specification, illustrates several embodiments of the invention and together with the description serves to explain the principles of the invention.
As used in this specification and in the claims which follow, the singular forms “a,” “an” and “the” include plural referents unless the context clearly dictates otherwise.
As used in this specification and in the claims which follow, the word “comprise” and variations of the word, such as “comprising” and “comprises,” means “including but not limited to,” and is not intended to exclude, for example, other additives, components, integers or steps. When an element is described as comprising a plurality components, steps or conditions, it will be understood that the element can also be described as comprising any combination of such plurality, or “consisting of” or “consisting essentially of” the plurality or combination of components, steps or conditions.
“Therapeutically effective amount” means that amount which, when administered to a human for supporting or affecting a metabolic process, or for treating or preventing a disease, is sufficient to cause such treatment or prevention of the disease, or supporting or affecting the metabolic process.
When ranges are given by specifying the lower end of a range separately from the upper end of the range, or specifying particular numerical values, it will be understood that a range can be defined by selectively combining any of the lower end variables, upper end variables, and particular numerical values that is mathematically possible. In like manner, when a range is defined as spanning from one endpoint to another, the range will be understood also to encompass a span between and excluding the two endpoints.
When used herein the term “about” will compensate for variability allowed for in the pharmaceutical industry and inherent in products in this industry, such as differences in product strength due to manufacturing variation and time-induced product degradation. The term allows for any variation which in the practice of good manufacturing practices would allow the product being evaluated to be considered therapeutically equivalent or bioequivalent in humans to the recited strength of a claimed product.
In the context of the present invention insofar as it relates to any of the disease conditions recited herein, the term “treatment” means to reduce the occurrence of a symptom or condition, or to relieve or alleviate at least one symptom associated with such condition, or to slow or reverse the progression of such condition, or to manage or affect the metabolic processes underlying such condition. Within the meaning of the present invention, the terms also denote to arrest, delay the onset (i.e., the period prior to clinical manifestation of a disease) and/or reduce the risk of developing or worsening a disease.
The phrase “acceptable” as used in connection with compositions of the invention, refers to molecular entities and other ingredients of such compositions that are physiologically tolerable and do not typically produce untoward reactions when administered to a subject (e.g., a mammal such as a human).
In one embodiment the invention provides a ready to use diclofenac formulation comprising: (a) diclofenac or a pharmaceutically acceptable salt thereof; (b) an alkalizing agent imparting a pH of from about 7 to about 10 to the formulation, optionally comprising potassium or sodium bicarbonate; and (c) a sugar-based aqueous means for solubilizing and stabilizing said formulation; wherein the formulation is optionally a liquid.
In another embodiment the invention provides a liquid diclofenac formulation in a ready to use stick pack comprising: (a) a therapeutically effective amount of diclofenac or a pharmaceutically acceptable salt thereof; (b) an alkalizing agent imparting a pH of from about 7 to about 10 to the formulation, optionally comprising potassium or sodium bicarbonate; and (c) a sugar-based aqueous means for solubilizing and stabilizing said formulation.
In still another embodiment the invention provides a method of treating a condition selected from pain and migraine in a patient in need thereof comprising administering to said patient a therapeutically effective amount of any of the ready to use diclofenac formulations of the present invention, preferably one comprising: (a) diclofenac or a pharmaceutically acceptable salt thereof; (b) an alkalizing agent imparting a pH of from about 7 to about 10 to the formulation, optionally comprising potassium or sodium bicarbonate; and (c) a sugar-based aqueous means for solubilizing and stabilizing said formulation, wherein the formulation is optionally provided as a liquid formulation in a ready to use stick pack.
In various embodiments the therapeutically effective amount comprises about 50 mg of diclofenac or a pharmaceutically acceptable salt thereof. In other embodiments therapeutically effective amount comprises about 50 mg of diclofenac or a pharmaceutically acceptable salt thereof in from about 8 to about 25 or 50 g of said formulation. In other embodiments the therapeutically effective amount comprises about 50 mg of diclofenac or a pharmaceutically acceptable salt thereof in from about 8 to about 15 g or from about 15 to about 50 g or from about 15 to about 22 g of said formulation. In still other embodiments the therapeutically effective amount comprises about 50 mg of diclofenac or a pharmaceutically acceptable salt thereof in about 20 g of said formulation. The preferred salt of diclofenac in all embodiments is diclofenac potassium.
The formulation, and particularly the sugar-based aqueous means, can be defined in various terms. Thus, in one embodiment the sugar-based aqueous means comprises a sugar selected from the group consisting of mono-, di-, tri-, and tetra-saccharides and sugar alcohols and combinations thereof. In another embodiment the sugar-based aqueous means is selected from the group consisting of monosaccharides, sugar alcohols, water and combinations thereof; the monosaccharides are selected from the group consisting of glucose, fructose, and galactose; and the sugar alcohols are selected from the group consisting of ethylene and or propylene glycol; glycerol; erythritol; threitol; arabitol; xylitol; ribitol; mannitol; sorbitol; galactitol; fucitol; iditol; inositol; volemitol; isomalt; maltitol; lactitol; maltotriitol; maltotetraitol; and polyglycitol. In another embodiment the sugar-based aqueous means comprises a sugar selected from monosaccharides and sugar alcohols and combinations thereof; the monosaccharides are selected from the group consisting fructose; and the sugar alcohols are selected from the group consisting of glycerol; erythritol; xylitol; sorbitol; and maltitol.
The formulations can be provided in stick packs as a liquid or a solid powder or granule that is subsequently reconstituted in water prior to administration. Thus, the sugar-based aqueous means can be a liquid, or it can refer to a solid which is compatible with water when subsequently reconstituted. When a liquid stick pack is intended, the “sugar-based aqueous means” will be preceded by “liquid.”
The relative percentages of water and sugar in sugar-based aqueous means can vary, although it is generally preferable to have higher percentages of sugar. Thus, in some embodiments the sugar-based aqueous means comprises: from about 0% or 5% to about 95% water and from about 5% to about 95% of a sugar. In another embodiment the sugar-based aqueous means comprises from about 0% or 10% to about 60% water and from about 40% to about 90% of a sugar. In another embodiment the sugar-based aqueous means comprises from about 0% or 20% to about 40% water and from about 60% to about 80% of a sugar. In another embodiment the sugar-based aqueous means comprises: from 0% or 5% to about 95% water; and from about 5% to about 95% of a fruit sugar or monosaccharide or a combination thereof. In another embodiment the sugar-based aqueous means comprises: from about 0% or 10% to ab out 60% water; and from ab out 40% to ab out 90% of a fruit sugar or monosaccharide or a combination thereof. In another embodiment the sugar-based aqueous means comprises: from about 0% or 20% to about 40% water; and from about 60% to about 80% of a fruit sugar or monosaccharide or a combination thereof.
In another embodiment the sugar-based aqueous means comprises: from about 0% or 5% to about 95% water; and from about 5% to about 95% of a fruit sugar or monosaccharide or a combination thereof comprising: from about 10% to about 90% sorbitol; and from about 10% to about 90% of xylitol, maltitol, glycerol, fructose, erythritol or a combination thereof. In another embodiment the sugar-based aqueous means comprises: from about 0% or 10% to about 60% water; and from about 40% to about 90% of a fruit sugar or monosaccharide or a combination thereof comprising: from about 10% to about 90% sorbitol; and from about 10% to ab out 90% of xylitol, maltitol, glycerol, fructose, erythritol or a combination thereof. In another embodiment the sugar-based aqueous means comprises: from about 0% or 20% to about 40% water; and from about 60% to about 80% of a fruit sugar or monosaccharide or a combination thereof comprising: from about 10% to about 90% sorbitol; and from about 10% to about 90% of xylitol, maltitol, glycerol, fructose, erythritol or a combination thereof.
In another embodiment the sugar-based aqueous means comprises: from about 0% or 5% to about 95% water; and from about 5% to about 95% of sorbitol. In another embodiment the sugar-based aqueous means comprises: from about 0% or 10% to about 60% water; and from about 40% to about 90% of sorbitol. In another embodiment the sugar-based aqueous means comprises: from about 0% or 20% to about 40% water; and from about 60% to about 80% of sorbitol.
In another embodiment the sugar-based aqueous means comprises: from about 0% or 25% to about 75% water; and from about 25% to about 75% of xylitol. In another embodiment the sugar-based aqueous means comprises: from about 0% or 25% to about 75% water; and from about 25% to about 75% of maltitol. In another embodiment the sugar-based aqueous means comprises: from about 0% or 25% to about 75% water; and from about 25% to about 75% of glycerol. In another embodiment the sugar-based aqueous means comprises: from about 0% or 25% to about 75% water; and from about 25% to about 75% of fructose. In another embodiment the sugar-based aqueous means comprises: from about 0% or 55% to about 85% water; and from about 15% to about 45% of erythritol.
In some embodiments, a single sugar alcohol is included in the formulation selected from xylitol, maltitol, glycerin, erythritol, sorbitol, and non-crystallizing sorbitol. In other embodiments a combination of two sugar alcohols is included in the formulation selected from xylitol+sorbitol, xylitol+non-crystallizing sorbitol, maltitol+sorbitol, and maltitol+non-crystallizing sorbitol. When two sugar alcohols are present in combination, they are preferably present in a ratio of from about 10:90 to about 90:10.
In another embodiment the formulation comprises less than about 95% glycerol. In another embodiment the formulation is either substantially free of glycerol or completely free of glycerol. In another embodiment the formulation comprises less than about 15% ethanol. In another embodiment the formulation comprises less than about 2% ethanol. In still another embodiment the formulation is either substantially free of ethanol or completely free of ethanol.
Although bicarbonates ate preferred alkalizing agents, it will be understood that the formulations can contain any alkalizing agent, capable of producing the desired pH (preferably about 7.5 to about 10.0, or about 8.0 to about 9.0). Such compounds include, by way of example and without limitation, ammonia solution, ammonium carbonate, diethanolamine, monoethanolamine, potassium hydroxide, sodium borate, sodium carbonate, sodium bicarbonate, sodium hydroxide, triethanolamine, and trolamine and others known to those of ordinary skill in the art.
When a bicarbonate is used as the alkalizing agent, the formulations can also be defined more particularly in terms of the diclofenac and bicarbonate content of the formulation. Thus, in another embodiment the formulation comprises from about 0.1% to about 1% diclofenac or a pharmaceutically acceptable salt thereof; from about 0.05% to about 1.5% bicarbonate; and from 9 about 5% to about 99.85% of said sugar-based aqueous means. Once again, the diclofenac is preferably present as diclofenac potassium and the bicarbonate present as potassium bicarbonate.
In still another embodiment the formulation comprises from about 0.1% to about 1% diclofenac or a pharmaceutically acceptable salt thereof; from about 0.05% to about 1% bicarbonate or from about 0.1 to about 2% bicarbonate; and from about 95% to about 99.85% of said sugar-based aqueous means. Once again, the diclofenac is preferably present as diclofenac potassium and the bicarbonate present as potassium bicarbonate.
In another embodiment the formulation comprises additional ingredients selected from the group consisting of thickeners and sweeteners and taste modifying agents. In another embodiment the formulation comprises additional ingredients selected from the group consisting of sucralose, polyvinylpyrrolidone and hydroxyethylcellulose. Suitable taste-masking agents include cellulose hydroxypropyl ethers (HPC); low-substituted hydroxypropyl ethers (L-HPC); cellulose hydroxypropyl methyl ethers (HPMC); methylcellulose polymers; Ethylcelluloses (EC) and mixtures thereof; Polyvinyl alcohol (PVA); hydroxyethylcelluloses; carboxymethylcelluloses and salts of carboxymethylcelluloses (CMC); polyvinyl alcohol and polyethylene glycol co-polymers; monoglycerides, triglycerides, polyethylene glycols, modified food starch, acrylic polymers and mixtures of acrylic polymers with cellulose ethers; cellulose acetate phthalate; sepifilms such as mixtures of HPMC and stearic acid, cyclodextrins, and mixtures thereof.
Suitable flavoring agents include acacia syrup, acesulfame K, alitame, anise, apple, aspartame, banana, Bavarian cream, berry, black currant, butterscotch, calcium citrate, camphor, caramel, cherry, cherry cream, chocolate, cinnamon, bubble gum, citrus, citrus punch, citrus cream, cotton candy, cocoa, cola, cool cherry, cool citrus, cyclamate, cylamate, dextrose, eucalyptus, eugenol, fructose, fruit punch, ginger, glycyrrhetinate, glycyrrhiza (licorice) syrup, grape, grapefruit, honey, isomalt, lemon, lime, lemon cream, monoammonium glyrrhizinate, maltol, mannitol, maple, marshmallow, menthol, mint cream, mixed berry, neohesperidine DC, neotame, orange, pear, peach, peppermint, peppermint cream, raspberry, root beer, rum, saccharin, safrole, sorbitol, spearmint, spearmint cream, strawberry, strawberry cream, stevia, sucralose, sucrose, sodium saccharin, saccharin, aspartame, neotame, acesulfame potassium, mannitol, talin, xylitol, sucralose, sorbitol, swiss cream, tagatose, tangerine, thaumatin, tutti fruitti, vanilla, walnut, watermelon, wild cherry, wintergreen, xylitol, and mixtures thereof.
In another embodiment the formulation of the present invention has a density of from about 1.02 to about 1.5 g/ml. In another embodiment the formulation of the present invention has a density of from about 1.05 to about 1.35 g/ml. In still another embodiment the formulation of the present invention has a density of from about 1.1 to about 1.25 g/ml.
The materials used to construct the laminate sheet for the stick pack can be any that are customary in the art, such as polyester, polypropylene, polyethylene and polyethylene terephthalate (PET), provided that the stick pack is sufficiently tear resistant until correctly manipulated. In preferred embodiments the laminate comprises a layer of aluminum foil. Examples of suitable designs for stick packs are described, for example in US 2015/0144518A1 and US20030168375A1. Suitable stick packs can also be purchased from companies such as Unette Corporation (Randolph N.J.) and Amcor 360 Packaging Solutions (Melbourne Australia).
In another embodiment the formulation is present in a stick pack comprising a trilaminate of polyester, aluminum and polyethylene. In another embodiment the formulation is present in a stick pack comprising a trilaminate of polyester, aluminum and polyethylene, wherein said trilaminate: (a) has a layer thickness of 12/8.5/65 μm, respectively; (a) has a weight of 16.8/22.9/59.9 g/mq, respectively; (c) has micropores in the aluminum layer less than 300/mq.
In still other embodiments the formulation of the present invention has a pH of from about 7.5 to about 10.0. In another embodiment the formulation of the present invention has a pH of from about 8.0 to about 9.0.
In another embodiment the formulation of the present invention comprises less than about 1% total impurities. In another embodiment the formulation of the present invention has less than about 1% total impurities after storage at 40° C.±2° C. and 75% RH±5% RH for three or six months.
In another embodiment the diclofenac is present in the formulation as diclofenac potassium and the bicarbonate is present as potassium bicarbonate. In another embodiment the diclofenac is present in the formulation as diclofenac potassium and said bicarbonate is present as potassium bicarbonate at a weight ratio of from about 50:10 to about 50:100, about 50:10 to about 50:50, or about 50:50 to about 50:100, preferably about 50:22 or about 50:66.
In certain embodiments, the sugar-based aqueous means comprises sorbitol, and the sorbitol is either a crystallizing sorbitol solution or a non-crystallizing sorbitol solution, or a combination of both, as those terms are understood in the art and described in the United States Pharmacopoeia in effect on Dec. 1, 2019. In one particular embodiment the formulation comprises between 25% and 90% of a non-crystallizing sorbitol solution. In one particular embodiment the liquid formulation of the present invention comprise a sugar-based aqueous means contains both non-crystallizing sorbitol solution and crystallizing sorbitol solution.
In another embodiment the liquid formulation of the present invention comprises a sugar-based aqueous containing an antimicrobial agent.
In any of the embodiments and embodiments of the present invention, it will be understood that the formulation can be present as a liquid, and that the liquid will predominantly be water. Thus, in any of the embodiments and embodiments of this invention the formulation can be present as a liquid and the sugar based aqueous means comprise greater than about 5%, about 10%, or about 20% water. Alternatively, in any of the embodiments and embodiments of the invention the formulation can be present as a liquid, and the sugar based aqueous means comprise from about 5% to about 50% water or from about 10% to about 40% water. Alternatively, in any of the embodiments and embodiments of the invention the formulation can be present as a liquid comprising greater than about 5%, about 10%, or about 20% water. Alternatively, in any of the embodiments and embodiments of the invention the formulation is present as a liquid comprising from about 5% to about 50% water or from about 10% to about 40% water.
In the following examples, efforts have been made to ensure accuracy with respect to numbers (e.g., amounts, temperature, etc.) but some errors and deviations should be accounted for. The following examples are put forth so as to provide those of ordinary skill in the art with a complete disclosure and description of how the methods claimed herein are made and evaluated and are intended to be purely exemplary of the invention and are not intended to limit the scope of what the inventors regard as their invention.
All the formulations/prototypes described herein have been tested for all or some of the following parameters: (1) Taste/Smell/Texture; (2) pH (3) Appearance; and (4) Assay and Impurities. Impurities were analyzed using two separate methods.
Assay and Impurity Method A (Impurities 1, 2, 3, 4, 6)
ANALYTICAL EQUIPMENT: HPLC
ANALYTICAL COLUMN: ALLTIMA C18 5 μm 250×4.6 mm or equivalent
MOBILE PHASE: 72.5% Methanol 27.5% buffer potassium dihydrogen phosphate (KH2PO4) 0.01M; Correct the mobile phase to pH 3.75±0.10 with phosphoric acid
FLOW RATE: 1.3 mL/min
WAVELENGTH: 256 nm
INJECTED VOLUME: 20 μL
TEMPERATURE: 30° C.
ACQUISITION LENGTH: 25 minutes
SOLVENT: Methanol
RELATED SUBSTANCE RETENTION TIME:
IMPURITY A (3): about 6.5 min
IMPURITY B (6): about 15.0 min
IMPURITY C (4): about 9.0 min
IMPURITY 1: about 3.5 min
IMPURITY 2: about 4.5 min
DICLOFENAC K RETENTION TIME: about 11.0 minutes
Impurity Profile (Impurity 5) Method B
ANALYTICAL EQUIPMENT: HPLC
ANALYTIC COLUMN: ALLTIMA C18 5 μm 250×4.6 mm or equivalent
MOBILE PHASE: 60.0% Acetonitrile; 39.5% Water; 0.4% Phosphoric Acid; 0.1%
Triethylamine; correct the mobile phase to pH 5.00±0.20 with Sodium Hydroxide 1N
FLOW RATE: 1.2 mL/min
WAVELENGTH: 256 nm
INJECTED VOLUME: 20 μL TEMPERATURE COLUMN: 25° C.
ACQUISITION LENGTH: 25 minutes
IMPURITY 5: about 9.0 min
DICLOFENAC K RETENTION TIME: about 8.0 minutes
Total Impurities
CALCULATE THE AMOUNT OF TOTAL IMPURITIES % by the formula: Impurities total %: Σ Impurities total % (Method A)+Σ Impurities total % (Method B);
Notes
The reporting threshold for impurities is 0.1%, according to ICH Q3B_R2;
The related substances retention times are indicative and referred to the main peak.
Stability Studies
All the formulations/prototypes manufactured and here below described have been stored under the following storage conditions:
Primary Packaging
The following primary packaging has been evaluated for R&D stability purposes:
Amber Glass Vial 15 ml (filled with 8 ml of formula, leaving headspace of about 7 ml);
Stick packs used for stability testing were made of a Polyester/Aluminum/Polythene tri-layer laminate characterized by the following properties:
Anhydrous substance: 68.0-72.0%
Water: 28-32%
D-glucitol (D-sorbitol): 72.0-92.0% (Anhydrous substance)
The crystallizing sorbitol solution used in the following Examples is the Emprove® Essential (Merk) that complies with the USP-NF specifications related to crystallizing sorbitol solution. The characteristics of Emprove® Essential are as follows:
Anhydrous substance: 69.0-72.0%
Water: 28.5-31%
D-glucitol (D-sorbitol): 92.0-101.0% (Anhydrous substance)
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Non crystallizing Sorbitol Solution in a glass container; treat the solution with nitrogen flow for about 30 minutes;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring and under nitrogen flow;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring and under nitrogen flow for all the time;
Filter the solution;
Store the solution in the selected container;
Treat the headspace of the container with nitrogen flow before close the container.
Analytical Evaluations
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula; a reduced concentration of sorbitol in comparison to Example 1 is tested.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of water and Non crystallizing Sorbitol Solution in a glass container; treat the solution with nitrogen flow for about 30 minutes;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring and under nitrogen flow;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring and under nitrogen flow for all the time;
Filter the solution;
Store the solution in the selected container;
Treat the headspace of the container with nitrogen flow before close the container.
Analytical Evaluations
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula; a reduced concentration of sorbitol in comparison to Examples 1 and 2 has been tested.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of water and Non crystallizing Sorbitol Solution in a glass container; treat the solution with nitrogen flow for about 30 minutes;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring and under nitrogen flow;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring and under nitrogen flow for all the time;
Filter the solution;
Store the solution in the selected container;
Treat the headspace of the container with nitrogen flow before close the container.
Analytical Evaluations
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula; the sorbitol syrup used for Examples 1, 2 and 3 is replaced with water.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of water in a glass container; treat the solution with nitrogen flow for about 30 minutes;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring and under nitrogen flow;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring and under nitrogen flow for all the time;
Filter the solution;
Store the solution in the selected container;
Treat the headspace of the container with nitrogen flow before close the container.
Analytical Evaluations
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula. Differently from Example 1, the preparation has not been carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Non crystallizing Sorbitol Solution in a glass container;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
Analytical Evaluations
The Time 6 months analyses have been performed only on stick packs
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula. Differently from Example 2, the preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of water and Non crystallizing Sorbitol Solution in a glass container;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
Analytical Evaluations
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula. Differently from Example 3, the preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of water and Non crystallizing Sorbitol Solution in a glass container;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
Analytical Evaluations
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula, using water as solvent. Differently from Example 4, the preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of water in a glass container;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
Analytical Evaluations
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula; the sorbitol used in the previous examples is replaced with Xylitol in both the prototypes that have the same quali/quantitative formula but differ for the use of nitrogen during the manufacturing.
Quali/Quantitative Formulation
Manufacturing Method
PFS DK 46-bkT038/122
Transfer the total quantity of water and Xylitol in a glass container; treat the solution with nitrogen flow for about 30 minutes and wait for the complete dissolution;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring and under nitrogen flow;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring and under nitrogen flow for all the time;
Filter the solution;
Store the solution in the selected container;
Treat the headspace of the container with nitrogen flow before close the container.
PFS DK 43-bkT038/118
Transfer the total quantity of water and Xylitol in a glass container and wait for the complete dissolution;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
Analytical Evaluations
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula; maltitol and sucralose are here mixed with water to obtain the formula. The preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Maltitol syrup and water in a glass container;
Add Sucralose and Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
Analytical Evaluations
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula; glycerin is here used to obtain the formula. The preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of glycerin and water in a glass container;
Add Sucralose and Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
Analytical Evaluations
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula; erythritol is here used to obtain the formula. The preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of water in a glass container;
Add Erythritol, Sucralose and Potassium Bicarbonate and wait for the complete dissolution; maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
Analytical Evaluations
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula; water and fructose are here mixed to obtain the formula. The preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of water in a glass container and dissolve the Fructose;
Add Diclofenac K, sucralose and Potassium Bicarbonate and stir until complete dissolution;
Filter the solution;
Store the solution in the selected container.
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in, differently from Example 1, 12.5 g of formula. The preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Non crystallizing Sorbitol Solution in a glass container;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
Analytical Evaluations
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula; sorbitol and xylitol are here mixed for both the prototypes that have the same quali/quantitative formula but differ for the use of nitrogen during the manufacturing.
Quali/Quantitative Formulation
Manufacturing Method
PFS DK 49-bkT038/126
Transfer the total quantity of Non crystallizing Sorbitol Solution, Xylitol and water in a glass container; treat the solution with nitrogen flow for about 30 minutes;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring and under nitrogen flow;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring and under nitrogen flow for all the time;
Filter the solution;
Store the solution in the selected container;
Treat the headspace of the container with nitrogen flow before close the container.
PFS DK 44-bkT038/119
Transfer the total quantity of Non crystallizing Sorbitol Solution, Xylitol and water in a glass container;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
Analytical Evaluations
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula; sorbitol and xylitol are here mixed for both the prototypes that have the same quali/quantitative formula but differ for the use of nitrogen during the manufacturing.
Manufacturing Method
PFS DK 48-bkT038/125
Transfer the total quantity of Non crystallizing Sorbitol Solution, Xylitol and water in a glass container; treat the solution with nitrogen flow for about 30 minutes;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring and under nitrogen flow;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring and under nitrogen flow for all the time;
Filter the solution;
Store the solution in the selected container;
Treat the headspace of the container with nitrogen flow before close the container.
PFS DK 45-bkT038/121
Transfer the total quantity of Non crystallizing Sorbitol Solution, Xylitol and water in a glass container;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
Analytical Evaluations
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula. Differently from Example 1, Sucralose is added to Non crystallizing Sorbitol Solution; the preparation is carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Non crystallizing Sorbitol Solution in a glass container; treat the solution with nitrogen flow for about 30 minutes;
Add Sucralose and Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring and under nitrogen flow;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring and under nitrogen flow for all the time;
Filter the solution;
Store the solution in the selected container;
Treat the headspace of the container with nitrogen flow before close the container.
Analytical Evaluations
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in, differently from Example 13, in 18.2 g of formula. The preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Non crystallizing Sorbitol Solution in a glass container;
Add Sucralose and Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
Analytical Evaluations
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in, differently from Example 1, 18.2 g of formula. Differently from Example 14, the formula does not contain Sucralose. The preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Non crystallizing Sorbitol Solution in a glass container;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
Analytical Evaluations
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 18.2 g of formula. The addition of PVP, with and without a flavoring agent, is here evaluated. The preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Non crystallizing Sorbitol Solution in a glass container;
Add PVP and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Add the flavor (for PFS DK 85)
Store the solution in the selected container.
Analytical Evaluations
Stability data (performed only on PFS DK 87-bkT038/170)
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 18.2 g of formula. The addition of Hydroxyethylcellulose (HEC) and Polyvinylpyrrolidone (PVP), with a flavoring agent, is here evaluated. The preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Dissolve under stirring all the PVP, add the HEC in water and wait for the complete dissolution (about 3 hours);
Transfer the total quantity of Non crystallizing Sorbitol Solution in a glass container;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Mix the solutions obtained;
Add the flavor and mix for 5 minutes;
Store the solution in the selected container.
Analytical Evaluations
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula; sorbitol and erythritol are here mixed with sucralose and water to obtain the formula. The preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Non crystallizing Sorbitol Solution, Erythritol and water in a glass container;
Add Sucralose and Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 16 g of formula; Sorbitol and Glycerin are here mixed to obtain the formula. The preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Non crystallizing Sorbitol Solution, Glycerin, Potassium
Bicarbonate and Diclofenac in a glass container and stir until complete dissolution;
Transfer the total quantity of water in a glass container and dissolve the Plasdone K29/32 and the Hydroxyethyl cellulose;
Mix the two preparations obtained as above described and stir until a homogeneous solution is obtained;
Add the flavor maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
Analytical Evaluations
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 16 g of formula; Sorbitol and Glycerin are here mixed to obtain the formula, in a different ratio in comparison to Example 23. The preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Non crystallizing Sorbitol Solution, Glycerin, Potassium Bicarbonate and Diclofenac in a glass container and stir until complete dissolution;
Transfer the total quantity of water in a glass container and dissolve the Plasdone K29/32 and the Hydroxyethylcellulose;
Mix the two preparations obtained as above described and stir until a homogeneous solution is obtained;
Add the Bitter masking maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container
Analytical Evaluations
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 16 g of formula; Sorbitol and Maltitol are here mixed to obtain the formula. The preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Non crystallizing Sorbitol Solution, Maltitol, Potassium Bicarbonate and Diclofenac in a glass container and stir until complete dissolution;
Add the half part of hydroxyethylcellulose and stir until complete dissolution;
Transfer the total quantity of water in a glass container and dissolve the Plasdone K29/32 and the half part of hydroxyethylcellulose;
Mix the two preparations obtained as above described and stir until a homogeneous solution is obtained;
Add the flavor maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
Analytical Evaluations
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 16 g of formula; Sorbitol and Fructose are here mixed with thickening agents to obtain the formula. The preparation is not carried out under nitrogen.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Non crystallizing Sorbitol Solution, Fructose, Potassium Bicarbonate and Diclofenac in a glass container and stir until complete dissolution;
Add the half part of hydroxyethylcellulose and stir until complete dissolution;
Transfer the total quantity of water in a glass container and dissolve the Plasdone K29/32 and the half part of hydroxyethylcellulose;
Mix the two preparations obtained as above described and stir until a homogeneous solution is obtained;
Add the flavor maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 12.9 g of formula; Sorbitol is here mixed with Polyvinylpyrrolidone as a thickening agent to obtain the formula. The preparation is carried out with laboratory equipment in a higher batch size compared with the previous batches, not under nitrogen but under vacuum conditions.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Non crystallizing Sorbitol Solution, in the mixer tank, under vacuum conditions;
Add all the Plasdone K29/32 and mix at regular intervals until a homogeneous solution is obtained, maintaining the apparatus under vacuum conditions;
Add Potassium Bicarbonate and Diclofenac, mix at regular intervals until a homogeneous solution is obtained, maintaining the apparatus under vacuum conditions;
Store the solution in the selected container.
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 12.9 g of formula; Sorbitol is here mixed with Polyvinylpyrrolidone as thickening agent and bitter masking as flavoring agent to obtain the formula. The preparation is obtained by the addition of the flavoring agent to Prototype PFS DK 119.
Quali/Quantitative Formulation
Manufacturing Method
The bitter masking is added on a fraction of the prototype PFS DK 119 and mixed until a homogeneous solution is obtained;
Store the solution in the selected container.
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 12.2 g of formula; Sorbitol and Glycerin are here mixed with Polyvinylpyrrolidone as thickening agent to obtain the formula. The preparation is carried out with a laboratory equipment, in a higher batch size compared with the previous batches, not under nitrogen but under vacuum conditions.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Glycerin, in the mixer tank, under vacuum conditions;
Add all the Plasdone K29/32 and mix at regular intervals until a homogeneous solution is obtained, maintaining the apparatus under vacuum conditions;
Add the total quantity of Non crystallizing Sorbitol Solution
Add Potassium Bicarbonate and Diclofenac, mix at regular intervals until a homogeneous solution is obtained, maintaining the apparatus under vacuum conditions;
Store the solution in the selected container.
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 12.2 g of formula; Sorbitol and Glycerin are here mixed with Polyvinylpyrrolidone as thickening agent and bitter masking as flavoring agent to obtain the formula. The preparation is obtained by the addition of the flavoring agent to Prototype PFS DK 121.
Quali/Quantitative Formulation
Manufacturing Method
The bitter masking is added on a fraction of the prototype PFS DK 121 and mixed until a homogeneous solution is obtained;
Store the solution in the selected container.
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 12.9 g of formula; Sorbitol and Maltitol are here mixed with Polyvinylpyrrolidone as thickening agent. The preparation is carried out with a laboratory equipment, in a higher batch size compared with the previous batches, not under nitrogen but under vacuum conditions.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Maltitol, in the mixer tank, under vacuum conditions;
Add all the Plasdone K29/32 and mix at regular intervals until a homogeneous solution is obtained, maintaining the apparatus under vacuum conditions;
Add the total quantity of Non crystallizing Sorbitol Solution
Add Potassium Bicarbonate and Diclofenac, mix at regular intervals until a homogeneous solution is obtained, maintaining the apparatus under vacuum conditions;
Store the solution in the selected container.
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 12.9 g of formula; Sorbitol and Maltitol are here mixed with Polyvinylpyrrolidone as thickening agent and bitter masking as flavoring agent to obtain the formula. The preparation is obtained by the addition of the flavoring agent to Prototype PFS DK 123.
Quali/Quantitative Formulation
Manufacturing Method
The bitter masking is added on a fraction of the prototype PFS DK 123 and mixed until a homogeneous solution is obtained;
Store the solution in the selected container.
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 12.3 g of formula; the addition of Polyvinylpyrrolidone and Hydroxyethylcellulose to the formula, with and without a flavouring agent, is here evaluated. The preparation is not carried out under nitrogen.
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 17.2 g of formula; the addition of Polyvinylpyrrolidone and Hydroxyethylcellulose to the formula, with and without a flavouring agent, is here evaluated. The preparation is not carried out under nitrogen.
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 12.3 g of formula; Sorbitol and Glycerin are here mixed with Polyvinylpyrrolidone and Hydroxyethylcellulose to obtain the formula, with and without a flavouring agent. The preparation is not carried out under nitrogen.
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 16.1 g of formula; Sorbitol and Glycerin are here mixed with Plasdone and Hydroxyethylcellulose to obtain the formula, with and without a flavouring agent. The preparation is not carried out under nitrogen.
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 12.2 g of formula; Sorbitol and Maltitol are here mixed with Polyvinylpyrrolidone and Hydroxyethylcellulose to obtain the formula, with and without a flavouring agent. The preparation is not carried out under nitrogen.
The following formulations have been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in about 16.1 g of formula; Sorbitol and Maltitol are here mixed with Polyvinylpyrrolidone and Hydroxyethylcellulose to obtain the formula, with and without a flavouring agent. The preparation is not carried out under nitrogen.
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula. The preparation is carried out as done for the PFS DK 34 (see Example 5) but using the Crystallizing Sorbitol Solution instead the Noncrystallizing one.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Crystallizing Sorbitol Solution in a glass container;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula. The preparation is carried out as done for the PFS DK 42 (see Example 6) but using the Crystallizing Sorbitol Solution instead the Noncrystallizing one.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of water and Crystallizing Sorbitol Solution in a glass container;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 20 g of formula. The preparation is carried out as done for the PFS DK 41 (see Example 7) but using the Crystallizing Sorbitol Solution instead of the non-crystallizing one.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of water and Crystallizing Sorbitol Solution in a glass container;
Add Potassium Bicarbonate and wait for the complete dissolution (about 5 minutes); maintain the system under stirring;
Add Diclofenac Potassium and wait at least 2 hours maintaining the system under stirring;
Filter the solution;
Store the solution in the selected container.
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 18.2 g of formula. The preparation is carried out as done for the PFS DK 87 (see Example 20) but using the Crystallizing Sorbitol Solution instead the Non-crystallizing one.
Quali/Quantitative Formulation
Manufacturing Method
Transfer the total quantity of Non crystallizing Sorbitol Solution, in the mixer tank, under vacuum conditions;
Add all the Plasdone K29/32 and mix at regular intervals until a homogeneous solution is obtained, maintaining the apparatus under vacuum conditions;
Add Potassium Bicarbonate and Diclofenac, mix at regular intervals until a homogeneous solution is obtained, maintaining the apparatus under vacuum conditions;
Store the solution in the selected container.
The following formulation has been prepared to obtain a ready to use liquid solution containing 50 mg of Diclofenac in 18.2 g of formula. The preparations is carried out as done for the PFS DK 87 (see Example 20) . The changes are the quantity of Potassium Bicarbonate or the Buffering agents (Potassium Hydroxide and Sodium Bicarbonate)
Quali/Quantitative Formulations
On the basis of the data collected on the manufactured prototypes, the following considerations were made. These considerations are based on the oxidative impurities and total impurities content detected for the above-described examples; for the other parameters tested, any type of significant changes have been observed. The evaluations reported refer to samples stored both in the crimped amber vials and/or in the stick packs. The two packaging types were demonstrated to be equivalent or, in some cases, the stick packs were determined to have superior stability to crimped amber vials.
Considerations:
According to the data reported in the Example 1, Diclofenac Potassium was shown to be chemically stable for 6 months in a Non Crystallizing Sorbitol USP solution atthe accelerated storage conditions. The oxidative impurities and the total impurities content are within the tentative specification limits (less than 0.2% and 1% respectively) after 6 months of storage at accelerated storage conditions. (The 6 months accelerated conditions have been tested only for samples stored in stick packs).
On the basis of the data reported in Examples 1-4, the chemical stability of Diclofenac Potassium seems to be better with the higher sorbitol concentrations.
The chemical stability of Diclofenac potassium in the different Sorbitol solutions seems independent of the manufacturing method: under N2 (Examples 1) or in open air operative conditions (Examples 5).
According to Examples 9-13, Diclofenac Potassium was chemically stable also in presence of sugars other than Non Crystallizing Sorbitol USP solution; the prototypes obtained using Xylitol (Example 9) were stable after 6 months at all the storage conditions tested. The prototypes obtained using Maltitol (Example 10), Glycerin (Example 11), Erythritol (Example 12), were stable after 6 months at all the storage conditions tested.
According to the data reported in the Example 14, Diclofenac Potassium is chemically stable in a Non Crystallizing Sorbitol USP solution, independent of the ratio between Sorbitol and Diclofenac. The total impurities content falls within the tentative specification limits (less than 1%) after 6 months of storage at the accelerated conditions.
According to the data reported in some other Examples (i.e. 15, 22, and 25), Diclofenac Potassium is chemically stable also in presence of sugars in combination with Non Crystallizing Sorbitol USP solution.
Throughout this application, various publications are referenced. The disclosures of these publications in their entireties are hereby incorporated by reference into this application in order to more fully describe the state of the art to which this invention pertains. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
| Number | Name | Date | Kind |
|---|---|---|---|
| 20170319484 | Reiner | Nov 2017 | A1 |
| Number | Date | Country |
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| 3087983 | Nov 2016 | EP |
| 9744023 | Nov 1997 | WO |
| 2006133954 | Dec 2006 | WO |
| WO-2013052019 | Apr 2013 | WO |
| 2018138690 | Aug 2018 | WO |
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| APR Applied Pharma Research, S.A., International Application No. PCT/IB2019/060777 filed Dec. 13, 2019; International Search Report and Written Opinion; ISA/EP; dated Mar. 18, 2020; 12 pp. |
| Number | Date | Country | |
|---|---|---|---|
| 20200197302 A1 | Jun 2020 | US |
| Number | Date | Country | |
|---|---|---|---|
| 62779514 | Dec 2018 | US |
