Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/20—Pills, tablets, discs, rods
  • A61K9/28—Dragees; Coated pills or tablets, e.g. with film or compression coating
  • A61K9/2806—Coating materials
  • A61K9/2833—Organic macromolecular compounds
  • A61K9/284—Organic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyvinyl pyrrolidone
  • A61K9/2846—Poly(meth)acrylates
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/20—Pills, tablets, discs, rods
  • A61K9/2072—Pills, tablets, discs, rods characterised by shape, structure or size; Tablets with holes, special break lines or identification marks; Partially coated tablets; Disintegrating flat shaped forms
  • A61K9/2077—Tablets comprising drug-containing microparticles in a substantial amount of supporting matrix; Multiparticulate tablets
  • A61K9/2081—Tablets comprising drug-containing microparticles in a substantial amount of supporting matrix; Multiparticulate tablets with microcapsules or coated microparticles according to A61K9/50
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/0002—Galenical forms characterised by the drug release technique; Application systems commanded by energy
  • A61K9/0004—Osmotic delivery systems; Sustained release driven by osmosis, thermal energy or gas
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/20—Pills, tablets, discs, rods
  • A61K9/2072—Pills, tablets, discs, rods characterised by shape, structure or size; Tablets with holes, special break lines or identification marks; Partially coated tablets; Disintegrating flat shaped forms
  • A61K9/2077—Tablets comprising drug-containing microparticles in a substantial amount of supporting matrix; Multiparticulate tablets
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
  • A61K9/50—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
  • A61K9/5005—Wall or coating material
  • A61K9/5021—Organic macromolecular compounds
  • A61K9/5036—Polysaccharides, e.g. gums, alginate; Cyclodextrin
  • A61K9/5042—Cellulose; Cellulose derivatives, e.g. phthalate or acetate succinate esters of hydroxypropyl methylcellulose
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
  • A61K9/50—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
  • A61K9/5005—Wall or coating material
  • A61K9/5021—Organic macromolecular compounds
  • A61K9/5036—Polysaccharides, e.g. gums, alginate; Cyclodextrin
  • A61K9/5042—Cellulose; Cellulose derivatives, e.g. phthalate or acetate succinate esters of hydroxypropyl methylcellulose
  • A61K9/5047—Cellulose ethers containing no ester groups, e.g. hydroxypropyl methylcellulose

Definitions

• the invention relates to extended release delivery system for pharmaceutical such as structurally novel antidepressant venlafaxine hydrochloride active as an 24 hour extended release dosage form.
• the formulation comprises an inner solid particulate phase containing venlafaxine hydrochloride and one or more hydrophobic polymers, diluents, osmogen and binder polymers, an outer solid continues phase including one or more hydrophilic polymers and compressed into tablets and an functional coat surrounding the tablet optionally provided.
• the formulation provides osmo microseal venlafaxine particles and hydrophilic matrix 24 hours extended release dosage form for better control of blood plasma level then the conventional tablet formulation which are administered two or more times a day and there are comparatively lower incidents of nosea and vomiting.
• the invention also provides process of preparing osmo microseal extended release delivery system and using such system for treating human ailments such as treatment of depression..
• Venlafaxine Hydrochloride l-[2-(dimemylamino)-l-(4-methoxyphen ⁇ )ethyl] cyclohexanol Hydrochloride, is an important drug in the neuro- pharmacotherapeutic arsenal used for treatment of depression. Venlafaxine and the acid addition salts thereof are disclosed in US patent 4,535,186. Venlafaxine hydrochloride is administered in compressed tablet form in doses ranging from 75 to 350 mg/day, in divided doses two or three times a day. With the plural daily dosing regimen, the most common side effect is nausea, experienced by about forty five percent of patients under treatment with Venlafaxine Hydrochloride. Vomiting also occurs in about seventeen percent of the patients.
• Venlafaxine has been formulated into a controlled release dosage form with the ability to provide in a single dose a therapeutic blood serum level of the drug over a twenty four hour period.
• tighter plasma therapeutic range control can be obtained and a multiple dosing is avoided in this manner.
• the sharp peaks and troughs in blood plasma drug levels are avoided as well.
• WO 03 / 041692 discloses an alternative approach of preparing extended release spheroids of Venlafaxine.
• Venlafaxine Hydrochloride is coated on a non pareil inert core, which is further coated with an inert polymer layer and subsequently with a third coat of an polymeric layer which enables the controlled release.
• WO 01/51041 teaches a formulation comprising a tablet and a semi-permeable membrane surrounding the core tablet.
• the core comprises Venlafaxine and one osmotic agent.
• the semipermeable membrane surrounding the core has passageway drilled through it either mechanically or by laser.
• the coated osmotic drug delivery system based tablet is further coated with an external coat comprising a herapeutically effective amount of an anti-psychotic agent.
• WO 98 / 47491 teaches a novel controlled release composition and the system has been named totelliGITTansportersTM.
• the composition can be formulated as an tablet or an suppository and optionally coated with an anionic polymer for enteric effect.
• the said coat is proposed to prevent the initial burst effect and impart the gastrointestinal tract (GIT) stealth characteristics especially in the presence of food.
• Prior to coating the core tablet is prepared by mixing a blend of two polymers with opposite wetting characteristics and have a water contact angle theta such that cos of theta is between +0.9848 and -0.9848.
• Venlafaxine is a part of its exhaustive list of the drugs where the proposed technology could be applicable, it does not appear in any of the example.
• WO 03 / 055475 teaches a composition for once a day administration using hydrogel technology. It describes a process for the preparation of a solid controlled release pharmaceutical formulation comprising the steps of dissolving Venlafaxine and polyvi ⁇ yl pyrrolidone in an aqueous solvent, applying the resulting solution onto low viscosity hydrophilic polymer, homogeneously mixing the obtained granulate with a high viscosity hydrophilic polymer, and compressing the gjra ⁇ ulale to obtain a core which is then coated with a polymeric coating comprising a water high permeable polymer and a water low permeable polymer.
• a novel way has been found of formulating drug with high water solubility such as Venlafaxine Hydrochloride.
• a system is used with the inner phase being an osmotic core comprising a therapeutically effective amount of Active and at least one osmotic agent, a membrane surrounding the core and the outer phase comprising of hydrophilic polymer matrix; the blend is compressed into tablet and subsequently provided a functional coat.
• the combination of the inner osmo microsealed, hydrophobic core and the outer hydrophilic polymer matrix optionally with a functional coat is claimed to provide for an efficient control and modulation over the release pattern of Venlafaxine Hydrochloride.
• the core is prepared by the process of granulating admixture of drug, osmogen, diluent and binder with a solution / dispersion of swellable and permeable hydrophobic polymer, and if required, the granulation is followed by coating of the granules with the said hydrophobic polymer.
• the coating of the granules is achieved by a process known to person of ordinary skill in the said art.
• the resulting granules can be sifted and resifted to remove any agglomerate produced in the coating steps.
• coating ay also be achieved by repetitive re-granulation of granulated and subsequently dried mass.
• the fijrmed internal phase of osmotic core is further admixed with the external phase comprising of hydrophilic porymer(s), lubricants and glidants.
• This system is compressed into tablets arid further provided with a functional coat.
• the process involved in the preparation of the osmo- microsealed tablets, unlike the manufacturing of spheroids, is very simple and feasible using common equipment. Besides, inclusion of more than one rate- controlling mechanisms in one system provides for a greater control and modulation of the release pattern to achieve desired drug release profile and through it the targeted blood levels.
• a preferred tablet composition comprises:
• a hydrophobic core comprised of active ingredient (Venlafaxine hydrochloride), Sodium chloride, Microcrystalline cellulose, Oleic acid, medium chain triglyceride, Povidone K 90 D and Ethyl cellulose.
• active ingredient Venlafaxine hydrochloride
• Sodium chloride Sodium chloride
• Microcrystalline cellulose Oleic acid
• medium chain triglyceride Povidone K 90 D
• Ethyl cellulose e.g., a hydrophilic continuos phase consisting of Hydroxypropyl methylcellulose, Talc and Magnesium stearate.
• a functional coat on the compressed tablets consisting Ammonio methacrylate copolymer, Triethyl citrate, Titanium dioxide and color.
• FIG. 1 is a plot showing the drug release profile of Venlafaxine Hydrochloride from four different compositions of the drug in matrices using USP 1, 100 rpm and at 37' °C.
• FIG. 2 is a plot showing the plasma level profile of Venlafaxine Hydrochloride in Healthy Human volunteers.
• FIG. 3 is a plot showing the plasma level profile of O-desmethyl Venlafaxine Hydrochloride in Healthy Human volunteers.
• (4methoxyphenyl)ethyl]cyclohexanol hydrochloride is polymorphic. Any of the polymorphic forms may be used in the formulations of the present inventioa
• the invention provides for the administration of Venlafaxine in its free base, free acid, racemic, optically pure, diastereomeric and/or pharmaceutically acceptable salt forms.
• pharmaceutically acceptable salts refer to derivatives of the disclosed compounds wherein the therapeutic compound is modified by making acid or base salts thereof. Examples of pharmaceutically acceptable salts include, but are not limited to, non-toxic mineral or organic or inorganic acid salts of venlafaxine.
• such conventional non-toxic salts include those derived from acids such as hydrochloric, hydrobromic, sulfuric, sulfonic, sulfamic, phosphoric, nitric and the like; and the salts prepared from organic acids such as amino acids, acetic, propionic, succinic, glycolic, stearic, lactic, malic, tartaric, citric, ascorbic, pamoic, maleic, hydroxymaleic, phenylacetic, glutamic, benzoic, salicylic, sulfanilic, 2-acetoxybenzoic, fumaric, toluenesulfonic, methanesulfonic, ethane disulfonic, oxalic, isethionic, and the like.
• acids such as hydrochloric, hydrobromic, sulfuric, sulfonic, sulfamic, phosphoric, nitric and the like
• organic acids such as amino acids, acetic, propionic, succinic
• high water solubility or similar term when characterizing a drug, medicament or pharmaceutical fi>r use in the formulation of the invention refers to a solubility in water of at least about 50 mg / ml, preferably at least about 100 mg / ml or more, and more preferably greater than 150 mg / ml.
• the controlled release system of the invention includes the inner solid particulate phase and the outer solid continuous phase in a weight ratio within the range from about 0.3 : 1 to about 10 : 1, preferably from about 0.5 : 1 to about 4 : 1.
• the inner solid particulate phase contain drag in an amount within the range from about 5 % to about 75 % by weight, preferably from about 7 % to about 65 % by weight, a hydrophobic polymer in an amount within the range from about 0.5 % to about 65 % by weight, preferably from about 2 % to about 45 % by weight, an osmogen in the range from about 0.01 % to about 25 % by weight, preferably from 0.05 % to about 10 % by weight, a binder to provide strength / hardness to the particle in the range from about 0.1 % to about 10 % by weight, preferably from 0.5 % to about 8
• % by weight and it may contain a pharmaceutical diluent(s) in an amount within the range from about 0 % to about 90 % by weight, preferably from 20 % to about
• the inner solid particulate phase have a mean particle size within the range from about 0.01 micrometer to about 2 mm, and preferably from about 50 micrometer to about 0.5 mm.
• the outer continuous phase may contain one or more hydrophilic polymers in the range from about 3 % to. about 60 % by weight and preferably from about 10 % to about 55 % by weight.
• the outer continuous phase in the various formulation of the invention may optionally include one or more fillers or excipients in an amount within the range from about 1 % to about 70 % by weight and more preferably 10 % to about 40 % by weight, the above percentages being based on the weight of the uncoated dosage form.
• the uncoated dosage form also contains in the outer continous phase the recommended level of glidants, lubricants, dry binders and anti-adherents.
• the dosage of the invention is coated as is commonly done in the art to provide the desired functional property.
• the coaling may comprise from about 2 to about 20 % by weight, preferably from 2.5 to 10 % by weight of the uncoated tablet core.
• the hydrophobic polymer(s) insoluble in the liquids of the gastrointestinal tract which may be employed in the inner solid particulate phase includes by way of example and without limitation, ethyl cellulose, methyl cellulose, amino methacrylate copolymer, methacryhc acid copolymers, methacryhc acid acrylic acid ethyl ester copolymer, methacryhc acid esters neutral copolymer, dimethyl aminoethyl methacrylate-methacrylic acid esters copolymer, Cellulose acetate, vinyl methyl ether/ maleic anhydride copolymers.
• the hydrophobic polymer is suitable for use in the fo ⁇ m of a Non aqueous solution, aqueous suspension, an aqueous emulsion, or a water-containing organic solvent solution. They are also commercially available as, for example, Eudragit 30D., Eudragit E30D, Aquacoat ECD-30, Surelease E-7, Eudragit RS 30D, Eudragit NE 30D, Eudragit RL 30D, etc.
• Exemplary osmagens include organic and inorganic compounds such as salts, acids, bases, chelating agents, sodium chloride, lithium chloride, magnesium chloride, magnesium sulfate, lithium sulfate, potassium chloride, sodium sulfile, calcium bicarbonate, sodium sulfate, calcium sulfate, calcium lactate, d-mannitol, urea, tartaric acid, raffitiose, sucrose, alpha-d-lactose monohydrate, glucose, sorbitol, combinations thereof and other similar or equivalent materials which are widely known in the art.
• organic and inorganic compounds such as salts, acids, bases, chelating agents, sodium chloride, lithium chloride, magnesium chloride, magnesium sulfate, lithium sulfate, potassium chloride, sodium sulfile, calcium bicarbonate, sodium sulfate, calcium sulfate, calcium lactate, d-mannitol, urea, tartaric acid, raff
• diluents and “fillers” is intended to mean inert substances used as excipients to create the desired bulk, flow properties, and compression characteristics in the preparation of tablet.
• Such compounds include, by way of example and without limitation, dibasic calcium phosphate, kaolin, lactose, sucrose, mannitol, microcrystalline cellulose, powdered cellulose, precipitated calcium carbonate, sorbitol, and starch and other materials known to one o f ordinary skill in the art.
• the binder(s) used essentially to provide strength / hardness which may be employed in the inner solid particulate phase, includes by way of example and without limitation, polyacryl amide, poly-N-vinyl amide, poly-N-vinyl-acetamide, polyvinyl pyrolidone, starch, lactose, modified corn starch, sugars, gum accacia, alginic acid, carboxymethylcellulose sodiuni, tragacanth, gelatin, liquid glucose, methylcellulose, pregelatinized starch, polyethylene glycol, guar gum, polysaccharide, bentonites, invert sugars, collagen, albumin, polypropylene glycol, polyoxyethy ⁇ ene-polypropylene copolymer, polyethylene ester, polyethylene sorbitan ester, polyethylene oxide, and hydroxypropyl methylcellulose, combinations thereof and other materials known to one of ordinary skill in the art.
• Suitable Hydroxypropyl methylcelluloses include a low viscosity, preferably less than 10 Cps and more preferably 2 to 5 Cps.
• Other equivalents of the Hydroxypropyl methylcelluloses 2208 and 2910 USP, having the same chemical and physical characteristics as the proprietary products named above may be substituted in the formulation.
• the hydrophilic polymer(s) in the outer continuous phase includes by way of example and without limitation, hydroxyethyl cellulose, hydroxypropyl cellulose, sodium alginate, ⁇ arbomer (CarbopolTM), sodium catboxymethvl cellulose, xanthan gum, guar gum, locust bean gum, poly vinyl acetate, polyvinyl alcohol and hydroxypropyl methylcellulose.
• the functional coating layer which is optionally applied over the outer solid phase containing particles of the inner solid phase embedded therein may include one or more film-formers, such as the polymer like methacryhc acid esters neutral polymer, ethyl cellulose, cellulose acetate, polyvinyl alcohol-maleic anhydride copolymers, beta-pinene polymers, glyceryl esters of wood resins and the like.
• film-formers such as the polymer like methacryhc acid esters neutral polymer, ethyl cellulose, cellulose acetate, polyvinyl alcohol-maleic anhydride copolymers, beta-pinene polymers, glyceryl esters of wood resins and the like.
• Both core tablets as well as coating formulations may contain aluminium lakes to provide color.
• the film formers both in the inner particulate phase and on the outer continuous phase may be applied form a solvent system containing one or more solvents including water, ammonium hydroxide solution, sodium hydroxide solution, hydrochloric acid solution, alcohols like methyl alcohol, ethyl alcohol or isopropyl alcohol, ketones like acetone, or ehtylmethyl ketone, chlorinaed hydrocarbons like methylene chloride, dichloroethane, and 1,1,1-trichloroethane.
• solvents including water, ammonium hydroxide solution, sodium hydroxide solution, hydrochloric acid solution, alcohols like methyl alcohol, ethyl alcohol or isopropyl alcohol, ketones like acetone, or ehtylmethyl ketone, chlorinaed hydrocarbons like methylene chloride, dichloroethane, and 1,1,1-trichloroethane.
• Plasticizers can also be included in the dosage form to modify the properties and characteristics of the polymers used in the coats of inner particulate phase and / or on the coat of the compressed tablet.
• Plasticizers useful in the invention can include, by way of example and without hmitation, low molecular weight polymers, oligomers, copolymers, oils,, small organic molecules, low molecular weight polyols having aliphatic hydroxyls, ester-type plasticizers, glycol ethers, poly(propyiene glycol), multi-block polymers, single block polymers, low molecular weight poly(ethylene glycol), citrate ester-type plasticizers, triacetin, propylene glycol and glycerin.
• plasticizers can also include ethylene glycol, 1,2-butylene glycol, 2,3-butyIene glycol, styrene glycol, diethylene glycol, trielhylene glycol, tetraethylene glycol and other poly(ethylene glycol) compounds, monopropylene glycol monoisopropyl ether, propylene glycol monoethyl ether, ethylene glycol monoethyl ether, diethylene glycol monoethyl ether, sorbitol lactate, ethyl Iactate, butyl lactate, ethyl glycolate, dibutylsebacate, acetyltributylcitrate, triethyl citrate, acetyi triethyl citrate, tributyl citrate and allyl glycolate. It is also contemplated and within the scope of the invention, that a combination of plasticizers may be used in the present formulation.
• the dosage form of the invention can also include oils, for example, fixed oils, such as peanut oil, sesame oil, cottonseed oil, corn oil and olive oil; fatty acids, such as oleic acid, stearic acid and isostearic acid; and fatty acid esters, such as ethyl oleate, isopropyl myristate, fatty acid glycerides, medium chain triglycerides and acetylated fatly acid glycerides.
• fixed oils such as peanut oil, sesame oil, cottonseed oil, corn oil and olive oil
• fatty acids such as oleic acid, stearic acid and isostearic acid
• fatty acid esters such as ethyl oleate, isopropyl myristate, fatty acid glycerides, medium chain triglycerides and acetylated fatly acid glycerides.
• the dosage form of the invention can also comprise an antiadherent, glidant, lubricant, opaquant, colo ⁇ ant, polishing agents, acidifying agent, alkalizing agent, antioxidant, buffering gent and surface active agent.
• Antiadherents include, by way of example and without limitation, magnesium stearate, talc, calcium stearate, glyceryl behenate, Polyethylene glycols, hydrogenated vegetable oil, mineral oil, stearic acid and other materials known to one of ordinary skill in the art.
• Glidants include, by way of example and without limitation, comstarch, talc, calcium silicate, magnesium silicate, colloidal silicon dioxide, silicon hydrogel and other materials known to one of ordinary skill in the art.
• Lubricants include, by way of example and without limitation, calcium stearate, magnesium stearate, mineral oil, stearic acid, and zinc stearate and other materials known to one of ordinary skill inlhe art.
• Opaquant may be used alone or in combination with a colorant.
• Such compounds include, by way of example and without limitation, titanium dioxide and other materials known to one of ordinary skill in the art.
• ColoTant include, by way of example and without limitation, FD&C Red No. 3, FD&C Red No. 20, FD&C Yellow No. 6, FD&C Blue No. 2, D&C Green No. 5, D&C Orange No. 5, D&C Red No. 8, caramel, and ferric oxide, red, other F.D. & C. dyes and natural coloring agents such as grape skin extract, beet red powder, beta-carotene, annato, carmine, turmeric, paprika, and other materials known to one of ordinary skill in the art. The amount of coloring agent used will vaiy as desired.
• Polishing agents include, by way of example and without limitation, camauba wax, and white wax and other materials known to one of ordinary skill in the art.
• Acidifying agents include, by way of example and without hmitation, acetic acid, aniino acid, citric acid, fumaric acid and other alpha hydroxy acids, such as hydrochloric acid, ascorbic acid, and nitric acid and others known to those of ordinary skill in the art.
• Alkalizing agents include, by way of example and without limitation, ammonia solution, ammonium carbonate, diethanolamine, monoethanolamine, potassium hydroxide, sodium borate, sodium carbonate, sodium bicarbonate, sodium hydroxide, triethanolarnine, and trolamine and others known to those of ordinary skill in the art.
• Antioxidants include, by way of example and without limitation, ascorbic acid, ascorbyl palmitate, butylated hydroxyanisole, butylated hydroxytoluene, hypophophorous acid, monothioglycerol, propyl gallale, sodium ascorbate, sodium bisulfite, sodium formaldehyde sulfoxylate and sodiu ⁇ Tmetabisulfite and other materials known to one of ordinary skill in the art.
• Buffering agents include, by way of example and without limitation, potassium metaphosphate, potassium phosphate, monobasic sodium acetate and sodium citrate anhydrous and dihydrate and other materials known to one of ordinary skill in the art.
• the present dosage form can also employ one or more commonly known surface active agents that improve wetting of the tablet core or layers.
• Soaps and synthetic detergents may be employed as surfactants and as vehicles for detergent compositions.
• Suitable soaps include fatty acid alkali metal, ammonium, and triethanolamine salts.
• Suitable detergents include cationic detergents, for example, dimethyl dialkyl ammonium hatides, alkyl pyridinium halides, and alkylamine acetates; anionic detergents, for example, alkyl, aryl and olefin sulfonates, alkyl, olefin, ether and monog ⁇ yceride sulfates, and sulfosuccinates; nonionic detergents, for example, fetty amine oxides, fetty acid alkanolamides, and poly(oxyethyiene)- block-poly(oxypropylene) copolymers; and amphoteric detergents, for example, alkyl .beta-aminopropionates and 2-alkyiimidazoline quaternary ammonium salts; and mixtures thereo ' .
• anionic detergents for example, alkyl, aryl and olefin sulfonates, alkyl,
• step (a) jp-anulating the blended mixture of step (a) with the solution of Sodium Chloride from 0.001 to 25% by wt,;continuing the granulation with aqueous additives such as dispersion of ethyl cellulose 0.5 to 55% by wt., forming the inner osmo microsealed particulate phase; c. drying and lubricating the dried inner osmo microsealed particulate phase of step (d) with Hydroxypropyl Methylcellulose 1 to 98% by wt.,. Talc 0.001 to 5% by wt., and Magnesium stearate from 0.001 to 5% by wt. forming outer continuous phase; d.
• aqueous additives such as dispersion of ethyl cellulose 0.5 to 55% by wt.
• step (e) compressing the tablets of suitable shape from the lubricated mass of step (e); e. coating the said tablets of step (d) with an aqueous dispersion of Ammonio Methacrylate Copolymer 1 to 15% by wt., using gladent titanium specifying agent plasiticizer, suitable colour.
• the said inner osmo microsealed particulate phase and the outer continuous phase is in a ratio within the range of 0.01 :1 to 4 :1 preferably from 0.3 :1 to about 2:1.
• the inner osmo microsealed phase contain the drug Venlafaxine Hydrochloride from about 5% ti 55% by weight, the solid content of ethyl cellulose aqueous dispersion from 1% to 35% by weight, microcrystalline cellulose in an amount within the range from 5% to 50% by weight, Lactose in an mount from 5% to 50% by weight povidone in the range from 0.5% to 10% by weight, and sodium chloride from 0.002% to 5% by weight the above percentage being based on the weight of the inner osmo microsealed particulate phase.
• the said outer continuous phase contains Hydroxypropyl Methylcellulose from 5% to 60% by weight, Talc from 0.5% to 2% by weight, Magnesium stearate from 0.5% to 2% by weight, the above percentages being based on the weight of the core tablet.
• the coating dispersion of the tablet in addition to Ammonio Methacrylate Copolymer contains Talc as a glidant, Titanium dioxide as oacifying agent, Triethyl citrate as plasticizer and suitable color, from about 1 to 15% by weight of the tablet composition in addition.
• the aqueous ethyl cellulose dispersion contains ethyl cellulose additives such as. Olecic acid, Cetyl alcohol, Medium chain triglycerides, Ammonium Hydroxide 28%, Sodium lauryl sulphate and Dimethylpolysiloxane.
• ethyl cellulose additives such as. Olecic acid, Cetyl alcohol, Medium chain triglycerides, Ammonium Hydroxide 28%, Sodium lauryl sulphate and Dimethylpolysiloxane.
• the said Velafaxme Hydrochloride Cellulose Lactose and Providone are shifted through #60 using a turbo shifter before dry blending.
• the inner osmo microsealed particulate phase granules are dried in a tray dryer of temperature 55 to 60 C and the dried granules are passed through #20.
• the dried granules of inner osmo microsealed particulate phase are granulated with the dispersion of ethyl cellulose to acquire the necessary loading the ethyl cellulose.3
• plasticizers can also include ethylene glycol, 1,2-butylene glycol, 2,3-butylene glycol, styrene glycol, diethylene glycol, triethylene glycol, 2,3 butylene glycol, slyrene glycol, diethylene glycol, triethylene glycol, tetraethylen glycol and other pory (ethylene glycol) compounds, monopropylene glycol monoisopropyl ether, propylene glycol monoethyl ehetr, ethylene ' glycol monoethyl ether, diethylene glycol monoethyl ether, sorbitol lactate, ethyl lactate, butyl lactate, ethyl glycolate, dibutylsebacate, acetyltributylchrate, triethyl titrate, acetyl triethyl citrate tributyl citrate ad allyl glycolate.
• ethylene glycol 1,2-butylene glycol
• Suitable detergents include cationic detergents, for example, dimethyl dialkyl ammonium halides, alkyl pyridimum halides, and alkylamine • acetates; anionic detergents, for example, alkyl, aryl and olefin sulfonates, alkyl, olefin, ether and monoglyceride sulfetes, and sulfosuccipates; nonionic detergents, for example, fatty amine oxides, fatty acid alkanolamides, and poly (oxyethylene)- block- poly(oxypropylene) copolymers; and amphoteric detergents, for example, alkyl beta-aminopropionates ad 2-alkylimidazoline quaternary ammonium salts; and mixtures thereof.
• cationic detergents for example, dimethyl dialkyl ammonium halides, alkyl pyridimum halides, and alkylamine • a
• Example 1 illustrates the development sequence to arrive at the said extended release dosage form.
• the composition for Example 1 to 4 is recorded in Table 1.
• Venlafaxine Hydrochloride and Microcrystalline cellulose in rapid mixer granulator for 15.0 minutes.
• Prepare the binder liquid by dissolving Polyvinyl Pyrolidone in the required quantity of Water with stirring.
• Example 2 Mix Venlafaxine Hydrochloride,' Microcrystalline Cellulose and - dissolving Polyvinyl Pyrolidone in cone blender for 20.0 minutes. Granulate the blend with an.
• Example 5 The composition for Example 5 to 12 is recorded in Table 2, which illustrates the various combinations, and the processes, which can be used to prepare the claimed dosage form.
• Table 2 The composition for Example 5 to 12 is recorded in Table 2, which illustrates the various combinations, and the processes, which can be used to prepare the claimed dosage form.
• Prepare the film forming liquid by dissolving Cellulose acetate and polyethylene glycol into the required quantity of Dichloromethane: Isopropyl alcohol (2:1) with stirring.
• Example 6 Mix Venlafaxine Hydrochloride, Lactose and Mannitol in cone blender. Prepare the film forming liquid by dispersing Cellulose acetate and polyethylene glycol into the required quantity of Dichloromethane: Isopropyl alcohol (2:1) with stirring. Granulate the blended mass with an aqueous solution of Copolyvidone in a fluid bed processor.
• Example 10 Mix Venlafaxine Hydrochloride, sodium chloride and Microcrystalline Cellulose in RMG for 5.0 minutes. Granulate the mass with an aqueous solution of Povidone. Dry the granules in a fluid bed drier. Prepare the film forming liquid by dispersing Cellulose acetate and polyethylene glycol into the required quantity of Dichloromethane: Isopropyl alcohol (2:1) with stirring. Coat the dried granules with the film forming solution in a Wurster fluid bed processor. Lubricate the coated granules with Hydroxypropyl Methylcellulose, Dibasic Calcium Phosphate and glyceryl behenate in a cone blender. Compress the above blend into tablets and coat them with a freshly prepared dispersion of Eudragit RL, Eudragit RS, Triethyl citrate, Talc and Titanium dioxide in water.

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• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
• Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
• Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)

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Publications (2)

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ID=33495860

Family Applications (1)

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Cited By (10)

Families Citing this family (8)

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• 2003
  • 2003-06-05 IN IN504MU2003 patent/IN2003MU00504A/en unknown
• 2004
  • 2004-05-14 EP EP04770652A patent/EP1633330B1/en not_active Expired - Lifetime
  • 2004-05-14 WO PCT/IN2004/000133 patent/WO2004108117A2/en not_active Ceased
  • 2004-05-14 US US10/563,631 patent/US20070110808A1/en not_active Abandoned
  • 2004-05-14 ES ES04770652T patent/ES2286676T3/es not_active Expired - Lifetime
  • 2004-05-14 AT AT04770652T patent/ATE358472T1/de not_active IP Right Cessation
  • 2004-05-14 DE DE602004005709T patent/DE602004005709T2/de not_active Expired - Fee Related

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