Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/55—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having seven-membered rings, e.g. azelastine, pentylenetetrazole
• • 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
  • A61K9/0009—Galenical forms characterised by the drug release technique; Application systems commanded by energy involving or responsive to electricity, magnetism or acoustic waves; Galenical aspects of sonophoresis, iontophoresis, electroporation or electroosmosis
• • 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
  • A61K9/0012—Galenical forms characterised by the site of application
  • A61K9/0019—Injectable compositions; Intramuscular, intravenous, arterial, subcutaneous administration; Compositions to be administered through the skin in an invasive manner
  • A61K9/0024—Solid, semi-solid or solidifying implants, which are implanted or injected in body tissue

Definitions

• the present invention provides for a multi particulate matrix system (MPMS) comprising at least one type of particles which contains galantamine or a pharmacologically acceptable salt thereof as an active substance, wherein said at least one type of particles provides for a prolonged release of said active substance, and wherein all particles present in the MPMS are uncoated.
• MPMS multi particulate matrix system
• the invention further relates to a process of making such a MPMS and a pharmaceutical composition containing such a MPMS.
• the invention particularly relates to suitable oral formulations comprising the active ingredient galantamine hydrobromide , using such a technology.
• Prolonged release formulations offer the possibility of reducing dosage regimes for drugs, especially for those drugs administered orally to patients, by prolonging the time period during which pharmacologically effective levels of the active ingredient are present in the body. Prolonged release formulations thereby result in a better assurance of compliance, reduction of severity and frequency of side effects, since the drug level in the blood is more constant, and of drug level fluctuations associated with conventional immediate release formulations administered several times a day are avoided.
• Alzheimer disease is affecting 8% to 10% of people older than 65 and as many as 40% of those older than 85 years. It has enormous associated costs of as much as 80 to 100 billion USD per year, leads to psychiatric symptoms of burnout in caregivers and is the common cause of institutionalization of elderly persons .
• the prevalence of dementia in the nursing home population has been estimated at 25% to 74%. Suspicion of dementia is warranted whenever an elderly patient presents a memory complaint, difficulties with activities of daily living, personality change or a new behavioural problem.
• the life expectancy of the typical Alzheimer disease patient is 4 to 6 years.
• the system should both release therapeutically relevant concentrations of the active ingredient immediately after drug uptake and ensure that such concentrations are maintained over a prolonged period of time, when compared with a pure immediate-release formulation.
• such systems are state of the art:
• Ying-huan Li et al (Modulation of combined- release behaviours from a novel "tablets-in-capsule system", Journal of Controlled Release 2004, 95 ⁇ 3), 381-389) describes a multifunctional and multiple unit system, which contains versatile mini-tablets in a hard gelatine capsule, developed by preparing Rapid-release Mini-Tablets (RMTs) , coated Sustained-release Mini-Tablets (SMTs) , Pulsatile Mini-Tablets (PMTs) , and Delayed-onset Sustained- release Mini-Tablets (DSMTs), each with various lag times of release.
• RTTs Rapid-release Mini-Tablets
• SMTs coated Sustained-release Mini-Tablets
• PMTs Pulsatile Mini-Tablets
• DSMTs Delayed-onset Sustained- release Mini-Tablets
• a velocity-time curve could be obtained instead of the cumulative percentage drug release profile.
• a sustained release cisapride oral dosage formulation suitable for one-daily administration comprising a plurality of mini-tablets containing cisapride or a salt thereof with an organic acid.
• Said sustained release oral formulation is reported to be capable of releasing cisapride at different sites along the gastrointestinal tract.
• the mini-tablets include a proportion of immediate release tablets and a proportion of tablets which release cisapride in response to the pH environment at a given site in the distal regions of the gastrointestinal tract.
• Cisapride or a salt thereof is embedded in a matrix of hydrophilic polymer, which is then coated with a pH dependent polymer to provide the desired sustained release.
• Controlled release formulations comprising only one species of solid compacts are also known and include the following:
• the formulation is a controlled release or an immediate release formulation.
• the immediate release formulation contains a Class II drug together with a hydrophobic polymer.
• the drug and the polymer are co- dissolved in a common solvent, from which solid particles are formed containing the drug dispersed in the form of small particles in a polymeric matrix.
• the particles are stable against aggregation, and can bo put into capsules or tableted for administration.
• the controlled release formulations of WO 2005/084639 are in the form of tablets, capsules, mini-tabs, microparticulates or osmotic pumps. Enhancement of oral uptake of the drug by the use of bioadhesive polymers occurs through increased dissolution kinetics due to stable micronization of the drug, rapid release of the drug from the polymer in the GI tract and prolonged GI transit due to bioadhesive properties of the polymers .
• US 6,514,531 is directed to controlled-release dosage forms of Zolpidem or salts thereof adapted to release Zolpidem over a predetermined time period, according to a biphasic profile of dissolution, where the first phase is an immediate release phase and the second phase is a prolonged release phase.
• State of the art that specifically pertains to the drug galantamine includes the following documents:
• EP 0 915 701 Bl is concerned with a fast-dissolving tablet for oral administration comprising as an active ingredient a therapeutically effective amount of galantamine hydrobromide and a pharmaceutically acceptable carrier.
• the carrier comprises a spray dried mixture of lactose monohydrate and macrocrystalline cellulose as a diluent, a crospovidone or croscarmellose as an insoluble or poorly soluble cross- linked polymer disintegrant and glidants which do not comprise talc; moreover this patent discloses a direct compression process of preparing fast-dissolving tablets.
• EP 1 140 105 Bl relates to controlled release compositions for oral administration comprising galantamine.
• Said controlled release composition comprises particles comprising galantamine or a pharmaceutically acceptable acid addition salt thereof, a water soluble pharmaceutically acceptable excipient and optionally other pharmaceutically acceptable excipients. The particles are coated by a release rate controlling membrane coating.
• WO 2005/065662 Al is directed to an immediate release pharmaceutical solid dosage formulation comprising galantamine or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable excipient, with the proviso that the formulation does not contain microcrystalline cellulose .
• WO 2005/065661 A2 relates to an immediate and extended release dosage formulation comprising galantamine or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier, wherein the carrier is substantially free of a spray dried mixture of lactose monohydrate and microcrystalline cellulose; and wherein the formulation exhibits a dissolution profile such that after 0.5 h at least about 80% of the galantamine or galantamine salt is released after combining the dosage formulation with 500 ml purified water at 37 0 C in Apparatus 2.
• An object underlying the present invention is to provide a further simplified and thus inexpensive solid pharmaceutical formulation that provides for combined release, i.e. both fast onset and continuous release of the active ingredient galantamine, particularly galantamine hydrobromide .
• the present invention relates to a multi particulate matrix system comprising at least one type of particles, of which at least one enables a prolonged release of an active substance, but which consists only of uncoated particles.
• Such an uncoated solid dosage form offers the advantage of an easier scale-up, better cost- effectiveness due to lower cost of production, no need for sophisticated equipment and less time-consuming production processes.
• the uncoated particles according to the present invention can be prepared by direct compression which represents a very simple and easy method.
• the present invention provides a multi particulate matrix system (MPMS) comprising at least one type of particles which contains galantamine or a pharmacologically acceptable salt thereof as an active substance, wherein said at least one type of particles provides for a prolonged release of said active substance, and wherein all particles present in the MPMS are uncoated.
• MPMS multi particulate matrix system
• the MPMS according to the present invention may further contain a second type of particles.
• the second type of particles either provides for immediate or prolonged release of the active substance.
• the active substance is preferably galantamine hydrobromide .
• the present invention provides for a pharmaceutical solid dosage formulation comprising the multi particulate matrix system described above.
• the present invention provides for a process for the manufacture of a multi particulate matrix system as described above wherein each particle type of the multi particulate matrix system is prepared by a process comprising a step selected from the group consisting of dry granulation, wet granulation, melt granulation and direct compression, followed by mixing of the respective particle types .
• the present invention provides for a process for forming a pharmaceutical solid dosage formulation as described above comprising the step of melt granulation of a mixture containing at least the active ingredient and a binder to obtain granules, followed by either directly incorporating these granules into capsules or sachets, or by compressing them into tablets.
• Fig. 1 Morphology of galantamine HBr used in Ex. 1
• the present invention provides for a multi particulate matrix system (MPMS) comprising at least one type of particles which contains galantamine or a pharmacologically acceptable salt thereof as an active substance, wherein said at least one type of particles provides for prolonged release of said active substance, and wherein all particles present in the MPMS are uncoated.
• MPMS multi particulate matrix system
• Active ingredient in the context of this invention means galantamine or a pharmaceutically acceptable salt thereof.
• One type of particles in the context of this invention means that the particles have the same composition and approximately the same size and shape, e.g. 2, 3 or more mini tablets produced by the same process .
• Prolonged release in the context of this invention means that the dosage formulation exhibits a dissolution profile such that after 2 hours 20 to 60% of the active ingredient originally contained in a particle type is released, after 4 hours 4Q to 80% of the active ingredient contained in a particle type is released, and after 12 hours more than 70% of the active ingredient contained in a particle type is released after dissolving the dosage formulation in 500 ml USP buffer pH 6.8 at 37 0 C in an Apparatus 1 (Ph. Eur. and USP, baskets, 100 rpm) . Unless stated otherwise, all percentages given herein are by weight. Due to nature of the preparation process of the mini or micro tablets the dissolution values underlie certain variations (cf. Ph. Eur.) . Values above or below 5% of the indicated constraints given above are to be understood as falling within the indicated range (s) .
• 5% or more of galantamine or a pharmaceutically acceptable salt thereof are still present after 12h and even more preferred after 16h.
• 80% or more of galantamine or a pharmaceutically acceptable salt thereof are released after 12h and even more preferred after 16h.
• immediate release in the context of this invention means that 50% or more of the active ingredient contained in a particle type are dissolved under the above conditions after
• the MPMS of the present invention may contain two, three, four or more types of particles that differ in their compositions so as to provide for a different release of the active ingredient.
• the MPMS of the present invention may differ either in the amount of active ingredient contained in the respective particle types or the types and/or amounts of excipients in the respective particle types, In a further preferred embodiment of the present invention, the two, three or more particle types respectively differ in both the amount of active ingredient and the amount of excipients contained therein.
• At least one type of particles in the MPMS according to the present invention provides for a prolonged release of the active ingredient.
• the MPMS according to the present invention may further contain a second type of particles.
• the second type of particles either provides for immediate or prolonged release of the active substance.
• each particle type must in any case be different, i.e. one type of particles should release the active ingredient faster than the other ⁇ s) .
• the active substance contained in the particles of the MPMS may be present in the form of a salt, hydrate or solvate thereof. It may further be present in either anhydrous or solvated form, in a crystalline or non-crystalline form such as a polymorphic, pseudopolymorphic or amorphous form.
• active ingredient and “active substance” , which are used synonymously in this application, should be understood to include any such salt, solvate or crystal form of the respective active ingredient.
• the active substance is galantamine hydrobromide .
• the amount of active substance present in each particle type of the MPMS is 5-90% w/w, 8-60% w/w, and more preferably 10- 30% w/w.
• the amount of active substance present in each particle type of the MPMS is 1.5-50 mg, preferably 1-30 mg, and more preferably 1.5-15 mg .
• At least one type of the particles contained in the MPMS is non- spherical .
• the particles of the MPMS of the present invention may for example be present in the form of micro or mini tablets having a diameter of 1 mm to 5 mm.
• the particles of the MPMS may have the following characteristics:
• Weight 5-100 mg, preferably 10-80 mg, more preferably 10-60 mg
• Hardness 5-80 N, preferably 10-60 N, more preferably 15-50 N
• Diameter 1-6 mm, preferably 1-5 mm, more preferably 1.5-5 mm
• Shape round, oval, with or without bevelled edges, with or without imprint Thickness: 1-6 mm, preferably 1.2-5 mm, more preferably 1.4-3 mm
• Face surface flat or convex.
• the particles of the MPMS of the present invention may, in addition to the active ingredient, further comprise one or more pharmaceutically acceptable excipient(s) .
• Suitable excipients are selected from the group consisting of a diluent, a binder, a disintegrant , a gelling agent, a no ⁇ - swellable polymer, a lipid substance, a surfactant, a lubricant and a glidant.
• the diluent is selected from the group consisting of microcrystalline cellulose, powdered cellulose, composite materials combining crystalline cellulose with lactose (Cellactose, Tablettose) , guar gum (Avicel CE15) or silicified cellulose (Prosolv) , calcium hydrogen phosphate in anhydrous and hydrated form, various types of sugars such as lactose (anhydrous and monohydrate) , compressible sugar, fructose, dextrates, sugar alcohols such as mannitol, sorbitol, maltitol, xylitol, lactitol, or other sugars such as saccharose, raffirxose, trehalose, fructose or mixture thereof, calcium carbonate, calcium lactate or mixture thereof.
• the diluent is lactose (Tablettose) .
• the binder is selected from the group consisting of polyvinylpyrrolidone, Kollidon SR, microcrystalline cellulose, cellulose ether, hydroxyethy1cellulose , hydroxypropylcellulose, hydroxypropylmethylcellulose, Methocel ® K4M, starch, pregelatinised starch, or polymethacrylate, or mixtures thereof.
• the binder is selected from Kollidon SR and Methocel ® K4M.
• the disintegrant is selected from the group consisting of crospovidone, starch, pregelatinised starch, sodium starch glycollate, microcrystalline cellulose, carboxymethylcellulose sodium (CMC-Na) or calcium (CMC-Ca) , cross-linked CMC-Na, polacrilin potassium, low- substituted hydroxypropylcellulose or mixtures thereof .
• the gelling agent is selected from the group consisting of hydroxypropylmethylcellulose (HPMC) , hydroxypropylcellulose, hydroxycellulose phthalate, poly (ethyleneoxide) , polylactic acid, xanthan gum, alginates, sodium and calcium carboxymethylcellulose, carragheenan, carbomer, carbopol, methylhydroxyethylcellulose, propylhydroxyethylcellulose, poIyHEMA, methylcellulose, alginates and other swellable polymers.
• HPMC hydroxypropylmethylcellulose
• HPMC hydroxypropylmethylcellulose
• hydroxycellulose phthalate poly (ethyleneoxide)
• polylactic acid xanthan gum
• alginates sodium and calcium carboxymethylcellulose
• carragheenan carbomer
• carbopol methylhydroxyethylcellulose
• propylhydroxyethylcellulose propylhydroxyethylcellulose
• poIyHEMA poIyHEMA
• the non-swellable polymer is selected from the group consisting of water insoluble, non- swelling polymers such as: ethyl cellulose, cellulose acetate propionate, cellulose acetate, poly (ethyl acrylate, methyl methacrylate, trimethylammonioethyl methacrylate chloride) 1:2:0.1, sold as Eudragit ® RS 100 poly (ethyl acrylate, methyl methacrylate, trimethylammonioethyl methacrylate chloride) 1:2:0.2 copolymer, commercially available as Sudragit ® RL, polyvinylpyrrolidone acetate, Eudragit ® RS PO, polyvinyl chloride, polyvinyl acetate, and polyethylene.
• the non- swellable polymer is Eudragit ® RS PO.
• the lipid substance is selected from the group consisting of fatty alcohols with 10-18 C atoms such as stearol, palmitol, esters and ether of fatty acids such as mono, di and triglycerides with 10-18 C atoms in the fatty acid residue.
• the surfactant if present, is selected, from the group consisting of anionic surfactants, ampholytic surfactants, nonionic surfactants and cationic surfactants.
• the anionic surfactant is selected from the group consisting of organic sulphonates (RSO 3 " ) or sulphates (ROSO 3 " ) , potassium laurate , CH 3 (CH 2 ) K ) COCrK + , and sodium lauryl sulphate, CH3 (CH 2 ) 11SO4 " Na + .
• the most preferred anionic surfactant is sodium lauryl sulphate.
• the cationic surfactant is selected from the group consisting of organic quaternary ammonium halides, R ⁇ + Cl " , cetrimide, a mixture consisting of tetradecyl ⁇ about 68%) , dodecyl ⁇ about 22%) , and hexadecyltrimethylammonium bromides (about 7%) , as well as benzalkonium chloride, a mixture of alkylbenzyldimethylammonium chlorides of the general formula [C5H5CH2N "1" (CH3) 2-3 Cl " , where R represents a mixture ot alkyls from C3H17 to C 18 H 37 .
• ampholytic surfactant is selected from sulfobetaines , RN + (CH 3 ) 2 CH 2 CH 2 SO 3 " ) , N-Dodecyl- N,N-Dimethylbetaine, C 12 H 2 SN + (CH 3 ) 2 CH 2 COCr .
• the nonionic surfactant contains hydroxyl or polyoxyethylene (OCH 2 CH 2 O " ) groups, and more preferably it is selected from polyoxyethylated glycol monoethers, cetomacrogol , sorbitan esters (Spans) and polysorbates (Tweens) , or from polyoxyethylene- polyoxypropylene copolymers.
• the lubricant and the glidants are selected from the group consisting of stearic acid, magnesium stearate, magnesium palmitate, magnesium oleate, hydrogenated vegetable oil, hydrogenated castor oil, talc, sodium ⁇ tearyl fumarate , macrogols or mixtures thereof.
• a particularly preferred member of this group is magnesium stearate.
• the present invention provides for a pharmaceutical solid dosage formulation comprising the MPMS as defined above.
• the pharmaceutical solid dosage formulation may be in the form of a capsule, a tablet or a sachet. In a preferred embodiment, the solid dosage formulation is a capsule .
• the number of particles which are contained in a solid dosage formulation depends on the strength of the dosage unit and the desired particle size.
• the MPMS in a preferred embodiment is a capsule, tablet or sachet containing more mini matrix solid uncoated particles.
• the number of said solid uncoated particles depends on the strength of the dosage unit. This means that the size of a capsule can, within certain limits, be selected independent from the strength and number of solid uncoated particles contained therein, as long as the capsule can host the particles needed to provide a certain dosage.
• the present invention is directed to a process for the manufacture of a multi particulate matrix system as defined above.
• each particle type of the MPMS is separately prepared by a process comprising a step selected from the group consisting of dry granulation, wet granulation, melt granulation and direct compression, followed by mixing of the respective separately obtained particle types.
• “Dry granulation” means that powder components are mixed in an appropriate blender. The obtained homogenous mixture is agglomerated by roller compaction or slugging. The obtained compacts are crushed into granulate and if necessary sieved. Appropriate particle size fractions are used for manufacturing matrix tablets. "Wet granulation” means that the powder obtained, following the initial mixing of the components is granulated using proper quantities of granulation liquid. A drying step to remove the granulation liquid is necessary.
• Melt granulation means a granulation process by which granules are obtained through the addition of either a molten binder or a solid binder which melts during the process. In the latter case the plastic properties of the binder are used. After the granulation the binder crystallizes at room temperature .
• Direct compression involves the direct mixing of the dry components of the desired formulation, followed by a compression step to manufacture mini or micro tablets.
• the process does not involve the use of any liquid which may be the primary cause of instability of dosage forms and moreover requires an additional drying step to remove the granulation liquid in order to give the final dosage form. Therefore and also in view of cost aspects, direct compression is particularly preferred in this invention.
• the step of direct compression which is a preferred embodiment, includes the direct mixing of the dry components of the desired particle type, followed by a compression step to form a compact.
• a compact is to be understood as meaning particles in form of a micro or mini tablet having a diameter of 1 mm to 5 mm or less.
• the present invention relates to a process for forming a pharmaceutical solid dosage formulation as defined above comprising the step of melt granulation of a mixture containing at least the active ingredient and a binder to obtain granules, followed by either directly incorporation of these granules into capsules or sachets, or by compressing them into tablets.
• Mini tablets solid uncoated particles according to the present invention ⁇ were manufactured using a direct compression procedure (cf. Examples 1, 3, 4, 5) .
• a wet granulation procedure was used in Comparative Example 2.
• the average diameter of galantamine hydrobromide particles used in these Examples 1-5 was less than about 200 microns (D90 less than 250 microns/D50 less than about 100 microns) .
• the size distribution of galantamine hydrobromide particles was determined by laser diffraction.
• the method of determining the size of galantamine hydrobromide particles involved the use of a Malvern Mastersizer 2000 laser diffraction instrument. Samples for analysis were prepared by dispersing a weighed amount of galantamine hydrobromide in vegetable oil without sonication.
• Galantamine HBr having a morphology and particle size distribution as shown above, Sodium Lauryl Sulphate, Eudragit RS PO, Methocel K4M , Kolli ⁇ on SR, Magnesium stearate and talc in the amounts as indicated below were sieved through a 20 mesh sieve and mixed for an appropriate time period until a uniform mixture was formed. The resulting mixture was compressed using a rotary tabletting machine to give mini tablets (5 mm punches were used ⁇ . For administration, these mini tablets were filled into gelatine capsules of size 2.
• Galantamine HBr having a size distribution and morphology as described above, Tablettose, Methocel K4M and Magnesium stearate in the amounts as indicated below were sieved through a 20 mesh sieve and mixed for an appropriate time period until a uniform mixture was formed. The resulting mixture was compressed using a rotary tabletting machine to give mini tablets (5 mm punches were used) . For administration, these mini tablets were filled into gelatine capsules of size 2.
• Galantamine HBr having a size distribution and morphology as described above, Sodium Lauryl Sulphate and Methocel K4M were sieved through a 20 mesh sieve and mixed in a mini high shear granulator for an appropriate time period until a uniform mixture was formed.
• Eudragit RS PO was dissolved in ethanol, giving a granulation liquid. The constituents of the internal phase were wet granulated using the granulation liquid.
• the granule mixture was dried to constant weight in a laboratory fluid bed. The dried granules were sieved and mixed with the rest of excipients and compressed. The resulting mixture was then compressed using a rotary tabletting machine to give mini tablets (5 mm punches were used) .
• the mini tablets were filled into capsules size 2.
• Galantamine HBr having a morphology and particle size distribution as shown above, Sodium Lauryl Sulphate, Carbopol 971 P, Eudragit RS PO, Methocel K4M,Klucel EP, Magnesium stearate and talc in the amounts as indicated below were sieved through, a 20 mesh sieve and mixed for an appropriate time period until a uniform mixture was formed. The resulting mixture was compressed using a rotary tabletting machine to give mini tablets (5 mm punches were used ⁇ . For administration, these mini tablets were filled into gelatine capsules of size 2.
• Galantamine HBr having a morphology and particle size distribution as shown above, Sodium Lauryl Sulphate, Kollidon SR, Carbopol 971 P, Eudragit RS PO, Methocel K4M, Klucel EF, Magnesium stearate and talc in the amounts as indicated below were sieved through a 20 mesh sieve and mixed for an appropriate time period until a uniform mixture was formed. The resulting mixture was compressed using a rotary tabletting machine to give mini tablets (5 mm punches were used ⁇ . For administration, these mini tablets were filled into gelatine capsules of size 2.
• Galantamine HBr having a morphology and particle size distribution as shown above, Sodium Lauryl Sulphate, Xanthan gum, Methocel K4M, Klucel EF, Magnesium stearate and talc in the amounts as indicated below were sieved through a 20 mesh sieve and mixed for an appropriate time period until a uniform mixture was formed. The resulting mixture was compressed using a rotary tabletting machine to give mini tablets (5 mm punches were used) . For administration, these mini tablets were filled into gelatine capsules of size 2.
• Galantamine HBr having a morphology and particle size distribution as shown above, Sodium Lauryl Sulphate, PEG 6000, Polyox W ⁇ R303, Klucel EF, BHT ⁇ Butylated hydroxytoluene) , Magnesium stearate and talc in the amounts as indicated below were sieved through a 20 mesh sieve and mixed for an appropriate time period until a uniform mixture was formed. The resulting mixture was compressed using a rotary tabletting machine to give mini tablets (5 mm punches were used) . For administration, these mini tablets were filled into gelatine capsules of size 2.
• Galantamine HBr having a morphology and particle size distribution as shown above, Sodium Lauryl Sulphate, Eudragit RS PO, Methocel K4M, Kollidon SR, Klucel EF, Magnesium stearate and talc in the amounts as indicated below were sieved through a 20 mesh sieve and mixed for an appropriate time period until a uniform mixture was formed. The resulting mixture was compressed using a rotary tabletting machine to give tablets (8.5x4.5 mm punches were used) .
• Galantamine HBr having a morphology and particle size distribution as shown above, Sodium Lauryl Sulphate, Carbopol 971 P, Eudragit RS PO, Methocel K4M, Klucel EF, Magnesium stearate and talc in the amounts as indicated below were sieved through a 20 mesh sieve and mixed for an appropriate time period until a uniform mixture was formed. The resulting mixture was compressed using a rotary tabletting machine to give tablets (8.5 x 4.5 mm (for 100 ing tablets ⁇ or 13.5 x 7 mm (for 300 ing tablets) punches were used) .
• Example 11 is referring to 8 mg dose
• Example 12 is referring to 24 mg dose .
• Galantamine HBr having a morphology and particle size distribution as shown above, Sodium Lauryl Sulphate, Xanthan gum, Methocel K4M, Klucel EF, Magnesium stearate and talc in the amounts as indicated below were sieved through a 20 mesh sieve and mixed for an appropriate time period until a uniform mixture was formed. The resulting mixture was compressed using a rotary tabletting machine to give tablets (8.5 x 4.5 mm punches were used) .
• Example 13 is referring to 8 mg dose.
• the dissolution values ⁇ %) obtained in the above dissolution profile have an accuracy of ⁇ 5% due to the nature of the preparation process of the mini and micro tablets.
• Mini tablets prepared by Ex.l/Ex.4 comprise hydrophilic- lipophilic matrix polymers, while mini tablets prepared by Ex.3/Ex.5 only contain hydrophilic matrix polymers. Both types of polymers are satisfactory to form uncoated particle types that provided for prolonged release and can be used in a MPMS of the present invention. Moreover, the above Examples show that the size and shape of the active substance to be used to prepare a MPMS according to the present invention does not play any significant role in achieving stable formulation with prolonged release dissolution profile in comparison to other prolonged release systems.

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