Wockhardt Limited

Negma-Lerads

François Pruvost

Cyril Estanove

Girish Kumar Jain

Premchand Dalichandji Nakhat

Prashant Mandaogade

Rahul Dabre

Roshanlal Sandal

The invention relates to pharmaceutical compositions comprising rhein or diacerein or salts or esters or prodrugs thereof, optionally with one or more pharmaceutically acceptable excipients. The invention also relates to the methods for preparing such compositions.

Rhein or diacerein compositions

The invention concerns novel troxerutin with high trihydroxy-ethyl-rutin content. Said troxerutin has at least 92 wt. % of 7,3',4&#x2032;-trihydroxyethyl rutin and a wettability expressed in minutes less than 10 minutes, when said wettability is measured in a test consisting in measuring the time taken by 3.5 g of said enriched troxerutin powder to leave the surface of a beaker containing 100 ml of water, at a stabilised temperature of 20&#xb0; C., when said enriched troxerutin powder is poured at the surface of the water in said beaker, and a wettability less than 100 seconds when said wettability is measured in a test consisting in measuring the time taken by said enriched troxerutin to be wetted by the water contained in a receptacle, such as a beaker, when said enriched troxerutin has been deposited at the surface of the water, in the form of cores of 2 mm wide and 3 mm high weighing 63 ? 2 mg, at a stabilised temperature of 20&#xb0; C. Said troxerutin has improved properties of wettability and solubility in water.

Troxerutin with a high content of trihydroxyethylrutoside and process for its preparation

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Quimper, France

François Pruvost