Flavocoxid is a proprietary blend of purified plant derived bioflavonoids including Baicalin and Catechins. It inhibits COX-1, COX-2, and ALOX5 in vitro and in animal models. Flavocoxid has been approved for use as a medical food in the United States since 2004 and is available by prescription for use in chronic osteoarthritis in tablets of 500 mg under the commercial name Limbrel. However, in clinical trials serum liver enzyme elevations occurred in up to 10% of patients on flavocoxid therapy although elevations above 3 times the upper limit of normal occurred in only 1-2% of recipients. Since its release, however, there have been several reports of clinically apparent acute liver injury attributed to flavocoxid.