Polymorphs of efavirenz
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United States of America Patent
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Aug 14, 2012
Grant Date -
May 10, 2012
app pub date -
Jul 1, 2011
filing date -
Aug 19, 2004
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Abstract
The present invention relates to novel amorphous and crystalline forms of efavirenz, processes for their preparation and pharmaceutical compositions containing them. In accordance with the present invention efavirenz crude is dissolved in acetone at 25° C.-30° C., the solution is slowly added to water for 30 minutes at 0° C.-5° C., stirred for 1 hour at the same temperature, the separated solid is filtered, washed with water and dried at 55° C.-60° C. for 5 hours to give amorphous efavirenz.
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