The present invention relates to a multiparticulate extended-release pharmaceutical composition of mesalamine, and a process for the preparation thereof.
Mesalamine, 5-aminosalicylic acid, is an anti-inflammatory agent used for the treatment of mild to moderate active ulcerative colitis.
Mesalamine is commercially available in various dosage forms such as Asacol® (mesalamine 400 mg delayed-release tablets), Asacol® HD (mesalamine 800 mg delayed-release tablets), Apriso® (Mesalamine 375 mg extended-release capsules), Pentasa® (mesalamine 250 mg and 500 mg controlled-release capsules) and Lialda® (mesalamine 1.2 g delayed-release tablets) for oral administration. It is also commercially available for rectal administration as an aqueous suspension or as suppositories.
U.S. Pat. No. 6,551,620 discloses an oral pharmaceutical pellet formulation having controlled release profile, comprising a core and an enteric coating, wherein the active ingredient 5-amino-salicylic acid is present in the core in a non-gel forming polymer matrix, the matrix-forming polymer making up at least 1% by weight of the core.
U.S. Publication No. 2007/0071820 discloses a delayed-release pharmaceutical formulation comprising a drug and a disruption agent and further comprising a regulatory membrane coating on the core formed from a mixture of a water-soluble gel-forming polymer and a water-insoluble film-forming polymer.
European Patent No. EP 0 629 398 discloses a controlled-release pharmaceutical preparation comprising a core containing a medicinal compound and an enteric coating over the core, wherein the core contains a medicinal compound and an organic acid, and is film coated by an aqueous coating of water-insoluble and slightly water permeable acrylic polymer having a trimethylammonioethyl group.
The present invention provides an alternative multiparticulate extended-release pharmaceutical composition of mesalamine, which has a dissolution profile comparable to Apriso®.
An aspect of the present invention provides a multiparticulate extended-release pharmaceutical composition of mesalamine, comprising a) an inert core, b) an active ingredient layer comprising mesalamine and other pharmaceutically acceptable excipients, c) an inner coating layer comprising a water-insoluble cellulose derivative, and d) an outer coating layer comprising an enteric polymer.
The term “mesalamine”, as used herein, is intended to include isomers, polymorphs, solvates, and hydrates of mesalamine.
Mesalamine may exist in any polymorphic form, such as crystalline or amorphous.
The multiparticulate composition is contained in a dosage form, e.g., hard gelatin capsule or a sachet, or is formed into tablets by compression. Multiparticulates can be designed to provide extended-release, delayed-release, pulsatile, or bi-phasic release, or even site-specific release of the drugs.
The term “pharmaceutically acceptable excipients”, as used herein, includes diluents, disintegrants, lubricants, glidants, anti-oxidants, plasticizers, and opacifiers.
The term “inert core”, as used herein, includes sugar spheres (non-pareil seeds) or microcrystalline cellulose beads (Celphere®). The size of the inert core ranges from about 500 μm to about 850 μm.
The drug coated core is further coated with two coating layers, i.e., an inner coat and an outer coat. The inner coating comprises a water-insoluble cellulose derivative. Examples of water-insoluble cellulose derivatives include ethyl cellulose.
Ethyl cellulose is a hydrophobic film coating agent used in pharmaceutical preparations to modify the release of drugs. Commercially available grades of ethyl cellulose like Ethocel® standard premium with different viscosities can be used. Ethyl cellulose films may be modified to alter their solubility by the addition of hypromellose or a plasticizer. The concentration of ethyl cellulose may vary from 2% w/w to 5% w/w by weight of the total composition.
Hypromellose, or HMPC, is available in various grades, for example, K4M, K15M, and K35M. When present in an ethyl cellulose layer, HPMC modifies the characteristics of the ethyl cellulose layer.
The target weight gain after applying the inner coating may vary between 5% w/w to 10% w/w by weight of the uncoated composition.
The outer coating layer comprises an enteric polymer that prevents the release of the drug in acidic conditions, and releases the drug in an alkaline environment. Examples of enteric polymers include cellulose acetate phthalate, hydroxypropylmethylcellulose acetate phthalate, polyvinyl acetate phthalate, hydroxypropyl phthalate, hydroxypropylmethylcellulose phthalate (HPMC phthalate), hydroxypropylmethylcellulose acetate succinate, methacrylic acid/methyl methacrylate copolymers, e.g., Type A (Eudragit® L 100, Eudragit® L 12.5) and Type B (Eudragit® S 100, Eudragit® S 12.5), or mixtures Thereof.
According to one embodiment of this aspect, there is provided a multiparticulate extended-release pharmaceutical composition of mesalamine, comprising a) an inert core, b) an active ingredient layer comprising mesalamine and one or more pharmaceutically acceptable excipients, c) an inner coating layer comprising ethyl cellulose, and d) an outer coating layer comprising an enteric polymer.
According to one embodiment of this aspect, the multiparticulate extended-release pharmaceutical composition further comprises a multiparticulate immediate-release composition, wherein the multiparticulate immediate-release composition comprises a) an inert core, b) an active ingredient layer and one or more pharmaceutically acceptable excipients, and c) an outer coating layer comprising an enteric polymer. The ratio of multiparticulate extended-release composition to multiparticulate immediate-release composition is from 60:40 to 90:10.
According to another embodiment of this aspect, there is provided a process for the preparation of a multiparticulate extended-release pharmaceutical composition of mesalamine, comprising the steps of:
Suitable diluents are selected from the group comprising calcium carbonate, calcium phosphate-dibasic, calcium phosphate-tribasic, calcium sulfate, microcrystalline cellulose, silicified microcrystalline cellulose, cellulose powdered, magnesium oxide, dextrates, dextrins, dextrose, fructose, kaolin, lactitol, lactose, mannitol, sorbitol, starch, pregelatinized starch, sucrose, sugar compressible, sugar confectioners, or mixtures thereof.
Suitable disintegrants are selected from the group comprising sodium starch glycolate, pregelatinized starch, powdered cellulose, crospovidone, croscarmellose sodium, colloidal silicon dioxide, microcrystalline cellulose, sodium carboxymethylcellulose, dried corn starch, or mixtures thereof.
Suitable lubricants and glidants are selected from the group comprising stearic acid, magnesium stearate, calcium stearate, zinc stearate, sodium stearyl fumarate, glyceryl monostearate, glyceryl palmitostearate, hydrogenated vegetable oil, mineral oil, silicon dioxide, sodium lauryl sulfate, talc, sucrose esters of fatty acid, microcrystalline wax, yellow beeswax, white beeswax, or mixtures thereof.
Suitable anti-oxidants are selected from the group comprising butylated hydroxyanisole, propyl gallate, butylated hydroxytoluene (BHT), ascorbic acid, ascorbyl palmitate, alpha-tocopherol, bioflavonoids, or mixtures thereof.
The target weight gain after enteric coating ranges between 10% and 20% by weight of the uncoated composition.
The coating composition may further comprise pharmaceutically acceptable excipients such as plasticizers and opacifiers. Examples of plasticizers include acetylated triacetin, triethyl citrate, tributyl citrate, glycerol tributyrate, diacetylated monoglyceride, polyethylene glycols, propylene glycol, sesame oil, acetyl tributyl citrate, acetyl triethyl citrate, diethyl oxalate, diethyl phthalate, diethyl maleate, diethyl fumarate, dibutyl succinate, diethyl malonate, dioctyl phthalate, dibutyl sebacate, or mixtures thereof.
Suitable opacifiers are selected from the group comprising titanium dioxide, talc, calcium carbonate, behenic acid, cetyl alcohol, or mixtures thereof.
Suitable solvents that can be used for dispersing/dissolving the coating polymer or mesalamine are selected from the group consisting of water, ethanol, methanol, ammonium hydroxide, isopropyl alcohol, or mixtures thereof.
The following examples are representative of the invention, but are not to be construed as limiting the scope of the claims.
Batch A
Manufacturing Process:
Drug Layering
ER Coat
DR Coat
12) The polymeric dispersion from step 11) was sprayed onto the ER coated beads of step 8).
Batch B
Manufacturing Process:
Drug Layering
DR Coat
Beads obtained from Batch A and Batch B were filled into suitable sized hard gelatin capsules in the ratio of 85:15.
Dissolution Study
Table 1 shows the comparison of the dissolution profiles of the formulations of Example 1 vis-à-vis Apriso®. The dissolution was performed for 2 hours in 750 mL of 0.1N HCl at 100 rpm using the basket method followed by 1000 mL of pH 6.8 phosphate buffer at 100 rpm using the basket method. The samples were analyzed using the HPLC method as described in USP (USP 29, page 1352). As seen from the results, there is no difference in the dissolution of the composition of Example 1 and Apriso®.
Number | Date | Country | Kind |
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4045/DEL/2012 | Dec 2012 | IN | national |