Orally Disintegrating Compositions of Emoxypine
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(19) & (11) EP 2 248 516 A1 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: (51) Int Cl.: 10.11.2010 Bulletin 2010/45 A61K 9/00 (2006.01) A61K 9/20 (2006.01) A61K 31/44 (2006.01) (21) Application number: 10162059.9 (22) Date of filing: 05.05.2010 (84) Designated Contracting States: (72) Inventors: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB • Toksöz, Ahmet GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO 34398, Istanbul (TR) PL PT RO SE SI SK SM TR • Cifter, Ümit Designated Extension States: 34398, Istanbul (TR) BA ME RS • Türkyilmaz, Ali 34398, Istanbul (TR) (30) Priority: 06.05.2009 TR 200903548 (74) Representative: Sevinç, Erkan (71) Applicant: Sanovel Ilac Sanayi ve Ticaret A.S. Istanbul Patent & Trademark Consultancy Ltd. 34398 Istanbul (TR) Plaza-33, Büyükdere cad. No: 33/16 Sisli 34381 Istanbul (TR) (54) Orally disintegrating compositions of emoxypine (57) The present invention is related to an orally disintegrating composition comprising emoxypine or a pharmaceu- tically acceptable salt thereof and one or more pharmaceutically acceptable excipient. EP 2 248 516 A1 Printed by Jouve, 75001 PARIS (FR) 1 EP 2 248 516 A1 2 Description ative formulation contains emoxypine succinate and aux- iliary agents in core and a coating layer. The auxiliary Technical Aspect agents in the core comprise kaolin, potato starch, calcium stearate, stearic acid, talc and methyl cellulose. The coat- [0001] The present invention is related to an orally dis- 5 ing layer contains titanium dioxide and serge 80. integrating composition comprising emoxypine or a phar- [0007] In prior art, there are also several patents which maceutically acceptable salt thereof and one or more disclose orally disintegrating compositions but none of pharmaceutically acceptable excipient. them includes emoxypine or a pharmaceutically accept- able salt thereof. Background of the Invention 10 [0008] Orally disintegrating dosage forms are becom- ing an increasingly important issue in the area of better [0002] Emoxypine is a heteroaromatic antioxidant patient compliance comparative to the conventional solid which has a membranoprotective, nootropic and seda- dosage forms for oral administration such as capsules tive action. Its chemical name is 2-ethyl-6-methyl-3-hy- and tablets, which are the most commonly used. In par- droxypyridine and its chemical structure is shown in the 15 ticular pediatric and geriatric patients, and patients with Formula I. mental problems and non- compliant patients often ex- perience difficulties in swallowing solid dosage forms. Besides, conventional solid dosage forms are not suita- ble for bedridden or busy and travelling patients, in case 20 the patient may not have easy access to water. Thus, orally disintegrating compositions represent an alterna- tive for such patients and provide for a better patient com- pliance with recommended pharmaceutical therapies. In addition, medicaments which may be used for sedatives, 25 hypnotics, and antipsychotic are amendable such dos- age forms. [0009] Additionally oral administration of the drugs is difficult in patients having concomitant vomiting, nausea or diarrhoea. The orally disintegrating dosage form is one 30 of the advantageous methods to deliver the drugs to such [0003] Its aromatic activity range is very wide such as patients. By administering the orally disintegrating dos- increasing the stress resistance of organism. It acts as age forms, faster absorption of the drug occurs through the anxiolytic which doesn’t cause sleepiness or doesn’t buccal mucosa and it may reduce the first pass metab- have myorelaxant effect; its nootropic properties prevent olism leading to better efficacy of the drug. This dosage and reduce learning and memory defects in patients of 35 form enhances the clinical effects of some drugs by lead- old age under pathogenic factors. One of the activities ing to an increase in bioavailability and a reduction in of emoxypine is its anticonvulsant activity which shows side effects because of avoidance of first- pass liver me- antioxidant and antihypoxic properties. It increases the tabolism. attention concentration and capacity for work and de- [0010] It is difficult to develop orally disintegrating com- creases the toxic affect of alcohol. It inhibits peroxide 40 positions because of several different reasons. A satis- oxidation of lipids, increases the superoxidoxidase activ- fied orally disintegrating dosage form needs to meet a ity and elevates the ratio of lipid-protein. Also, provides number of requirements. Firstly, it has to disintegrate in a higher dopamine concentration in brain. the mouth spontaneously. The time in which a dosage [0004] Emoxypine is marketed under the brand name form must dissolve or disintegrate in the oral cavity is MEXIDOL®and it is administered orally in a therapeutic 45 necessarily much shorter than in the stomach. Moreover, dose from 125 mg to 250 mg, three times a day and it a premature release in the mouth could also lead to prob- has injectable formulations containing 50mg/ml in 2 ml lems due to the often unpleasant taste of the active in- and 5ml ampules in IV/IM forms. gredient. Besides, these compositions should be very [0005] Injectable and drop solutions of emoxypine HCl porous and should not be very hard. These porous com- were disclosed in US patent no 4,486,440 in 17.08.1983. 50 positions tend to be very sensitive to humidity. As a con- They are used as retinoprotector for treating intraocular sequence, they may have some stability problems. hemorrhage, myopic chorioretinal dystrophies, congen- [0011] To fulfill all these requirements the formulation ital retinal dystrophies, retinal burns and prevention of for a specific drug needs to be adapted in particular by injury in lasercoagulation. a careful selection of the excipients used. However, the [0006] A conventional tablet formulation of emoxypine 55 excipients selected may lead to formulations which are succinate (Mexidol ®) is described in PCT application WO not bioavailable to the corresponding conventional dos- 96/02238 A1, Aktsionernoe Obschestvo Zakrytogo Tipa age forms. Thus, they have to be chosen very carefully. ’Olvik’, 15.07.1994. The proposed neurotropic and sed- [0012] Additionally, precautions have to be taken at 2 3 EP 2 248 516 A1 4 the preparation, packaging, handling and storing of the collate and the like and mixtures thereof; preferably finished dosage forms of orally disintegrating composi- crosscarmellose sodium and/or crospovidone. tions since they tend to be both hygroscopic and friable. [0022] It has unexpectedly found that in this orally dis- [0013] Thus, a need rises for orally disintegrating com- integrating composition having a weight ratio of emox- positions of emoxypine or a pharmaceutically acceptable 5 ypineto super disintegrants, particularly crosscarmellose salt, which overcomes above described problems and sodium, in the range of between 1:10 and 10:1 (w/w), which further provide the advantageous property of al- has a synergistic effect over the disintegration time. Pref- lowing the active medicament to disintegrate or dissolve erably the range is between 1:5 and 5:1 (w/w). in the oral cavity without remaining substantial amounts [0023] In one embodiment, the amount of crosscar- of the active ingredient. 10 mellose sodium is present about 0.1 to 30% by weight of total composition; preferably it is about 2 to 10% by Description of the invention weight of total composition. [0024] In another embodiment, the amount of [0014] The main embodiment of the present invention crospovidone is about 0.1 to 20 % by weight of total com- is to provide a novel orally disintegrating composition 15 position; preferably it is about 2 to 10 % by weight of total comprising emoxypine or a pharmaceutically acceptable composition. salt thereof and one or more pharmaceutically accepta- [0025] Suitable diluents may include but not limited to ble excipient which overcomes the above described lactose, microcrystalline cellulose, mannitol, spray- dried problems in prior art and have additive advantages over mannitol, starch,sodium carbonate, sodium bicarbonate, them. 20 calcium carbonate and the like and mixtures thereof; pref- [0015] It has unexpectedly been found that the specific erably spray-dried mannitol and/or microcrystalline cel- combination of the emoxypine with the combination of lulose. the super disintegrants provides an orally disintegrating [0026] It is reported that, spray-dried mannitol, has composition which avoids the afore-mentioned disad- physical chemical properties that make it ideal for con- vantages of the orally disintegrating compositions of the 25 stituting the appropriate diluent for this invention. Be- prior art. cause it dissolves easily and quickly in a little amount of [0016] According to the invention an emoxypine orally water or saliva and its disintegrating rate is much faster disintegrating composition is provided which is funda- than powder mannitol and other related saccharine ex- mentally comparable with the existing regular conven- cipients. It is highly compressible and it has optimum flu- tional solid dosage forms such as tablets or capsules, 30 idity for direct compression processes. It has good dilu- however with the unexpected benefits found with oral tion capacity due to the size and form of the particle, disintegration. which makes it possible to accept large amounts of active [0017] In one embodiment the orally disintegrating ingredients that are not easily compressed. It is chemi- composition of emoxypine