Description: ONSIOR (robenacoxib) is a non-narcotic, non-steroidal anti-inflammatory drug (NSAID) of the coxib class. Tablets are round, beige to brown in color, not scored, flavored and contain 6 mg robenacoxib. The molecular weight of robenacoxib is 327.28. The empirical formula is C16-H13-F4-NO2.