A film coated tablet of brivaracetam

Abstract

The present invention relates to a film coated tablet comprising brivaracetam and at least one pharmaceutically acceptable excipient wherein brivaracetam has a d (0.9) particle size between 40 µm to 450 µm and lactose monohydrate and lactose anhydrous is present as diluent. Furthermore, the tablet is also obtained by using an effective process which is simple, rapid, cost effective, time-saving and industrially convenient process.

Description

[0001] A FILM COATED TABLET OF BRIVARACETAM

[0002] Field of the Invention

[0003] The present invention relates to a film coated tablet comprising brivaracetam and at least one pharmaceutically acceptable excipient wherein brivaracetam has a d (0.9) particle size between 40 pm to 450 pm and lactose monohydrate and lactose anhydrous is present as diluent. Furthermore, the tablet is also obtained by using an effective process which is simple, rapid, cost effective, time-saving and industrially convenient process.

[0004] Background of the Invention

[0005] The chemical name of brivaracetam is (2S)-2-[(4R)-2-oxo-4-propyl-pyrrolidin-1-yl]butanamide and its chemical structure is shown in the Formula I.

[0006] Formula I: Brivaracetam

[0007] The European Medicines Agency (EMA) and the US Food and Drug Administration (FDA) approved brivaracetam as an adjunctive therapy drug for the treatment of partial seizures with or without secondary generalized seizures of epilepsy patients of 16-year-old and older, under the trade name Briviact®. The drug is a derivative of levetiracetam and belongs to the 3rd generation of antiepileptic drug. Clinical trials evaluated the efficacy and safety of Brivaracetam (5, 20, 50 and 150 mg per day) in the adjunctive treatment of adult patients (16-65 years).

[0008] Brivaracetam is highly soluble and is Class I according to the Biopharmaceutical Classification System (BCS). The active substance is a white to off-white non-hygroscopic crystalline solid. Additionally, brivaracetam is an extremely viscous compound (adhesive capacity).

[0009] We found that the brivaracetam is extremely prone to sticking and picking during the preparation process, which brings great problems to the appearance and content uniformity of the final product.

[0010] Patent CN102292071 A discloses that the excipient "cyclodextrin" is used as a compacting agent to produce brivaracetam tablets, but since brivaracetam is an extremely viscous compound (adhesion ability), cyclodextrin can reduce the compaction and especially the bonding during the rolling process alleviates the risk of tablet sticking to a certain extent. PCT Patent Publications No. WO 2010 / 086315 and WO 2010 / 094535 disclose immediate release oral pharmaceutical formulation of Brivaracetam. These patent publications discloses dissolution, sticking problem associated with Brivaracetam, which is a major challenge during the formulation development.

[0011] In the prior art, several patents have been done for the tablet sticking problem of brivaracetam. However, since brivaracetam is an active ingredient that has flowability, compressibility and stability problems in formulation, focusing only on its tablet sticking to will not yield successful results.

[0012] There still remains a need in the art to provide an improved a film coated tablet comprising brivaracetam. In the present invention, the film coated tablet is created to overcome the above problems and provides additional advantages to the relevant field of art. Other advantages and embodiments of the present invention will be clarified in the following description.

[0013] Detailed Description of the Invention

[0014] The main object of the present invention is to provide a film coated tablet comprising brivaracetam with excellent properties, such as compressibility, flowability, homogeneity, and content uniformity which overcomes the above-described problems in the prior art and have additive advantages over them.

[0015] Another object of the present invention is to provide a desired stability of the film coated tablet comprising brivaracetam.

[0016] Another object of the present invention is to provide a film coated tablet comprising brivaracetam with the desired dissolution profile.

[0017] Another object of the present invention is to provide a process for preparing a film coated tablet comprising brivaracetam. The process is free of solvent, for example dry granulation or direct compression. It is a simple, rapid, cost effective, time-saving, and industrially convenient method.

[0018] Flowability is an important parameter in tablet formulation. Especially the high sticky behavior of the active substance caused flowability problems in formulations. The problem with flowability negatively affects the content uniformity and manufacturing process success, and the problem with the content uniformity negatively affects the dissolution profile. We have found that these problems are overcome when using brivaracetam in the particle sizes specified below. In addition, the compressibility problem was overcome with the use of lactose monohydrate and lactose anhydrous. So, both the content uniformity was ensured and the dissolution profile was brought to the desired level.

[0019] The use of active ingredient in the high particle sizes mentioned below improved the angle of repose. Therefore, uniformity of mass on the tablet gives better results. This is very important to ensure weight uniformity, especially in mini tablets. As used here in, ‘particle size’ means the cumulative volume size distribution as tested by any conventionally accepted method such as the laser diffraction method (i.e. Malvern analysis). The term d (0.1 ) means, the size at which 10% by volume of the particles are finer and d (0.5) means the size at which 50% by volume of the particles are finer and d (0.9) means the size at which %90 by volume of the particles is finer.

[0020] According to one embodiment of this invention, a film coated tablet comprising brivaracetam and at least one pharmaceutically acceptable excipient wherein brivaracetam has a d (0.9) particle size between 40 pm to 450 pm and lactose monohydrate and lactose anhydrous is present as diluent.

[0021] According to an embodiment of the present invention, the weight ratio of lactose anhydrous to lactose monohydrate is between 1 .0 and 2.0, preferably between 1 .1 and 1 .6, preferably between 1 .1 and 1 .4.

[0022] According to an embodiment of the present invention, the tablet comprises one more diluent.

[0023] Suitable diluents are selected from the group comprising microcrystalline cellulose, corn starch, starch, mannitol, calcium hydrogen phosphate dihydrate, dicalcium hydrogen phosphate anhydrate, calcium phosphate trihydrate, neutral pellets, magnesium carbonate, magnesium oxide, maltodextrin, maltose, medium chain triglycerides or mixtures thereof.

[0024] According to an embodiment of the present invention, diluent is microcrystalline cellulose.

[0025] According to an embodiment of the present invention, the amount of diluents is 50.0% to 85.0% by weight in the total composition. Preferably, the amount of diluents is 65.0% to 85.0% by weight in the total composition.

[0026] According to one embodiment of this invention, brivaracetam has a d (0.9) particle size between 55 pm to 94 pm or between 75 pm to 96 pm or between 104 pm to 125 pm or between 126 pm to 138 pm or between 139 pm to 152 pm or between 153 pm to 167 pm or between 168 pm to 183 pm or between 184 pm to 198 pm or between 203 pm to 218 pm or between 219 pm to 234 pm or between 237 pm to 253 pm or between 257 pm to 268 pm or between 269 pm to 278 pm or between 283 pm to 298 pm or between 304 pm to 345 pm or between 348 pm to 390 pm or between 395 pm to 445 pm Brivaracetam having above-described particle size provides the flowability and compressibility, mass uniformity also provides the improved dissolution profile.

[0027] According to one embodiment of this invention, brivaracetam has a d (0.1 ) particle size between 1 pm to 40 pm or between 4 pm to 34 pm or between 6 pm to 25 pm.

[0028] According to one embodiment of this invention, brivaracetam has a d (0.5) particle size between 8 pm to 85 pm or between 13 pm to 76 pm or between 22 pm to 65 pm or between 27 pm to 58 pm.

[0029] According to an embodiment of the present invention, the tablet is free of betadex (p-cyclodextrin). Adding p-cyclodextrin will bring in the formulation, the preparation and finished product in storage process has many problems. For example, the finished product comprising cyclodextrin during storing process will result increasing drug exposure in the body, causing adverse drug reactions, such as gastrointestinal tract reaction, toxic and side effect of the medicine.

[0030] According to an embodiment of the present invention, at least one pharmaceutically acceptable excipient is selected from the group comprising disintegrant, binders, lubricants, glidant or mixtures thereof.

[0031] The composition comprises a disintegrant, and the inventors have found that the use of the specified amount ranges of disintegrant in the pharmaceutical composition of the present invention has an unexpected anti-sticking effect, and used disintegrant is unexpectedly used as an anti-sticking agent for powder direct compression or dry granulation, It is beneficial to reduce the high sticky behavior of the active ingredient and avoid sticking and punching when tableting.

[0032] Suitable disintegrants are selected from the group comprising crospovidone, croscarmellose sodium, low-substituted hydroxypropyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, calcium carboxymethyl cellulose, sodium carboxymethyl starch, hydroxymethyl starch or mixtures thereof.

[0033] According to an embodiment of the present invention, the disintegrant is croscarmellose sodium.

[0034] According to an embodiment of the present invention, binder can be used in the film coated tablet. Suitable binders are selected from the group comprising hydroxypropyl cellulose, sodium carboxymethyl cellulose, polyvinylpyrrolidone, sodium carboxymethyl cellulose, polyethylene glycol, starch, pregelatinized starch, sodium alginate, hydroxypropyl methyl cellulose, carboxy methyl cellulose, methyl cellulose, guar gum, polymethacrylates, methacrylate polymers, polysaccharides, poloxamer, polyoxyethylene-alkyl ether, polydextrose, polyethylene oxide or mixtures thereof.

[0035] According to an embodiment of the present invention, the binder is hydroxypropyl methyl cellulose.

[0036] According to an embodiment of the present invention, the amount of binders is 1.5% to 30.0% by weight in the total composition. Preferably, the amount of binders is 1.5% to 15.0% by weight, more preferably it is 1 .5% to 6.0% by weight in the total composition.

[0037] Suitable lubricant is selected from the group comprising talc, sodium stearyl fumarate, magnesium stearate, potassium stearate, stearic acid, sodium chloride, sodium benzoate, sodium acetate, sodium oleate, polyethylene glycols or mixtures thereof.

[0038] According to one embodiment of the present invention, the lubricant is magnesium stearate.

[0039] According to one embodiment of the present invention, the amount of lubricant is between 0.3% and 2.0% by weight in the total formulation. Brivaracetam is stable to heat exposure but degrades and picks up water when exposed to both high temperature and humidity however, this problem is minimized by using film coating with appropriate content. Thus, stability is ensured.

[0040] According to one embodiment of the present invention, the film coated is based on Polyvinyl Alcohol or Hydroxypropylmethyl cellulose.

[0041] According to one embodiment of the present invention, the amount of film coated is between 2.0% and 5.0% by weight in the total formulation. This help to affect positively the distribution time.

[0042] According to one embodiment of the present invention, the film coated comprises;

[0043] • Polyvinyl Alcohol

[0044] • Titanium dioxide

[0045] • Talc

[0046] • PEG

[0047] • Coloring agent

[0048] According to one embodiment of the present invention, the film coated comprises;

[0049] • Hydroxypropylmethyl cellulose

[0050] • Titanium dioxide

[0051] • PEG

[0052] • Coloring agent

[0053] According to one embodiment of the present invention, the film coated tablet comprises;

[0054] • Brivaracetam having a d (0.9) particle size between 100 pm to 300 pm

[0055] • Lactose Monohydrate

[0056] • Lactose Anhydrous

[0057] According to one embodiment of the present invention, the film coated tablet comprises;

[0058] • Brivaracetam having a d (0.9) particle size between 100 pm to 300 pm

[0059] • Lactose Monohydrate

[0060] • Lactose Anhydrous

[0061] • Croscarmellose Sodium

[0062] • Mg Stearate

[0063] • Film coated tablet based on HPMC or PVA

[0064] In direct compression and dry granulation, the solid pharmaceutical compositions ingredients are not exposed to moisture, solvents and heat. Thus, in this invention, direct compression or dry granulation is used to process moisture, solvent and / or heat sensitive brivaracetam. In addition, these methods provide the desired compressibility and flowability without loss of active substance. Example 1 : The film coated tablet

[0065] A process for example 1 ; a) Mixing Brivaracetam, Lactose monohydrate, Lactose anhydrous, croscarmellose sodium for 15 minutes, b) Adding weighed and 0.6 mm sieved Magnesium stearate to dry mixture and mixing for 3 minutes, c) Compressing the mixture into tablets at appropriate specifications, d) Coating the tablets with film coating.

[0066] Example 2: The film coated tablet A process for example 2; a) Mixing Brivaracetam, lactose monohydrate, HPMC, and the half of the amount of croscarmellose sodium for 15 minutes, b) Adding weighed and 0.6 mm sieved 1 / 2 Magnesium stearate to dry mixture and mixing for 3 minutes, c) Performing slug granulation in compactor, d) Sieving dry granules 1 .2 mm, e) Adding 0.6mm sieved half of the amount of croscarmellose sodium, Lactose anhydrous and mixing for 5 minutes, f) Adding 0.6mm sieved 1 / 2 Mg-stearate and mixing for 3 minutes, g) Compressing the mixture into tablets at appropriate specifications, h) Coating the tablets with film coating.

[0067] Example 3: Mini tablet

[0068] A process for example 3; a) Mixing Brivaracetam, Lactose monohydrate, Lactose anhydrous, croscarmellose sodium for 15 minutes, b) Adding weighed and 0.6 mm sieved Magnesium stearate to dry mixture and mixing for 3 minutes, c) Compressing the mixture into tablets at appropriate specifications, d) Coating the tablets with film coating. e) The coated tablets are filled into the capsules.

[0069] Film coating examples

[0070] 1)

[0071] 2)

Claims

CLAIMS1 ) A film coated tablet comprising brivaracetam and at least one pharmaceutically acceptable excipient wherein brivaracetam has a d (0.9) particle size between 40 pm to 450 pm and lactose monohydrate and lactose anhydrous is present as diluent.2) The film coated tablet according to claim 1 , wherein the weight ratio of lactose anhydrous to lactose monohydrate is between 1.0 and 2.0, preferably between 1.1 and 1.6, preferably between 1 .1 and 1 .4.3) The film coated tablet according to claim 1 , wherein the tablet comprises one more diluent.4) The film coated tablet according to claim 3, wherein diluents are selected from the group comprising microcrystalline cellulose, corn starch, starch, mannitol, calcium hydrogen phosphate dihydrate, dicalcium hydrogen phosphate anhydrate, calcium phosphate trihydrate, neutral pellets, magnesium carbonate, magnesium oxide, maltodextrin, maltose, medium chain triglycerides or mixtures thereof.5) The film coated tablet according to claim 4, wherein diluent is microcrystalline cellulose.6) The film coated tablet according to claim 1 , wherein brivaracetam has a d (0.9) particle size between 55 pm to 94 pm or between 75 pm to 96 pm or between 104 pm to 125 pm or between 126 pm to 138 pm or between 139 pm to 152 pm or between 153 pm to 167 pm or between 168 pm to 183 pm or between 184 pm to 198 pm or between 203 pm to 218 pm or between 219 pm to 234 pm or between 237 pm to 253 pm or between 257 pm to 268 pm or between 269 pm to 278 pm or between 283 pm to 298 pm or between 304 pm to 345 pm or between 348 pm to 390 pm or between 395 pm to 445 pm7) The film coated tablet according to claim 1 , wherein brivaracetam has a d (0.1 ) particle size between 1 pm to 40 pm or between 4 pm to 34 pm or between 6 pm to 25 pm.8) The film coated tablet according to claim 1 , wherein brivaracetam has a d (0.5) particle size between 8 pm to 85 pm or between 13 pm to 76 pm or between 22 pm to 65 pm or between 27 pm to 58 pm.9) The film coated tablet according to claim 1 , wherein the tablet is free of betadex ( p- cyclodextrin).10) The film coated tablet according to claim 1 , wherein at least one pharmaceutically acceptable excipient is selected from the group comprising disintegrant, binders, lubricants, glidant or mixtures thereof.11 ) The film coated tablet according to claim 10, wherein disintegrants are selected from the group comprising crospovidone, croscarmellose sodium, low-substituted hydroxypropylcellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, calcium carboxymethyl cellulose, sodium carboxymethyl starch, hydroxymethyl starch or mixtures thereof.12) The film coated tablet according to claim 10, wherein binders are selected from the group comprising hydroxypropyl cellulose, sodium carboxymethyl cellulose, polyvinylpyrrolidone, sodium carboxymethyl cellulose, polyethylene glycol, starch, pregelatinized starch, sodium alginate, hydroxypropyl methyl cellulose, carboxy methyl cellulose, methyl cellulose, guar gum, polymethacrylates, methacrylate polymers, polysaccharides, poloxamer, polyoxyethylene-alkyl ether, polydextrose, polyethylene oxide or mixtures thereof.13) The film coated tablet according to claim 12, wherein the binder is hydroxypropyl methyl cellulose.14) The film coated tablet according to claim 1 , wherein, the tablet comprises;• Brivaracetam having a d (0.9) particle size between 100 pm to 300 pm• Lactose Monohydrate• Lactose Anhydrous

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