The subject matter of the present invention relates to the production of a tolperisone extended release tablet (GRDDS, Gastro Retentive Drug Delivery System) for the controlled release of the active substance tolperisone, with the objective of reaching a constant active substance level in the blood while avoiding the risk of exposing the patient to the potential genotoxic impurity 2-methyl-1-(4-methylpheny1)-propenone (4-MMPPO).
Commercially available IR tablets include, for example, Mydocalm and Mydeton. These tablets contain 4-MMPPO in significant quantities.
Currently, no CR formulations are commercially available.
Problem: Tolperisone tablets are unable to ensure a constant concentration of the active substance (tolperisone) in the blood. However, especially in cases of spastic muscle cramps, a constant efficacy, in particular throughout the night, is very important to the quality of life of the patients. Known tablet formulations release the active substance tolperisone in the intestine at pH 4 to 7. In this pH range, tolperisone breaks down into 4-MMPPO and piperidine, which can be demonstrated in laboratory tests. Thus, the patient is exposed to an uncontrollable quantity of 4-MMPPO.
Solution: Proposed are floating tolperisone tablets with the controlled release of the active substance tolperisone in the stomach at pH 1 to 2.
A CR floating tablet with tolperisone as the active substance, which can also be prepared free from 4-MMPPO, is currently not known.
Brief explanation and principle of the floatable oral therapeutic system
For a number of reasons, it may be medically important to ensure that a dosage form, an active substance, does not move within a very short time from the stomach into the intestinal tract but that it remains in the stomach over a prolonged period of time instead, e.g.:
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For tolperisone, a floating tablet based on the hydrodynamic principle and having a lower density than the gastric juice was developed. By adding acid adjuvants, such as citric acid, it is possible to produce a GRDDS (Gastro Retentive Drug Delivery System) that is free from 4-MMPPO.
Preparation from:
A powdered mixture of 2.5 g of tolperisone hydrochloride and 0.5 g of anhydrous citric acid is produced, and the mixture is pre-compacted. This pre-compacted mixture is mixed with the adjuvants Methocel K4M, Methocel K15M and Accurel MP 1000 and compressed in a tablet press at a pressure higher than 50 kN. A floatable CR tablet is obtained. Methocel K4M and Methocel K15M are water-soluble methylcellulose and hydroxypropyl methylcellulose polymers and are available from Dow Chemical Co., Midland, Mich., USA. Accurel MP 1000 is a microporous polypropylene powder available from Membrana GmbH/Accurel Systems, Obernburg, Germany.
The analytical assessment confirms a 4-MMPPO content lower than 1.5 ppm, relative to a 41.3% active substance content (tolperisone content).
The tablet core is subjected to coating with Eudragit (Eudragit E or RS or S) film. Eudragit film is made from Eudragit (E or RS or S) polymethacrylates available from Evonik Industries AG, Essen, Germany. The eudragit film is applied via spraying with air pressure.
The release curve shown in
This application claims the benefit of U.S. Provisional Application No. 61/158,440, filed Mar. 9, 2009, entitled “Tolperisone Controlled Release Tablet”, the contents of which are hereby incorporated by reference herein.
Number | Date | Country | |
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61158440 | Mar 2009 | US |