Patent 7750165 was granted and assigned to Fresenius Kabi Oncology PLC on July, 2010 by the United States Patent and Trademark Office.
The invention provides two crystalline forms A and B of the skeletal muscle relaxant and anxiolytic agent, Metaxalone of formula (I), and a process for preparation thereof. The two crystalline forms A and B are bioavailable. The invention further provides pharmaceutical compositions comprising the two bioavailable crystalline forms, useful for the relief of discomforts associated with acute, painful musculoskeletal conditions.