Firocoxib (INN; brand names Equioxx and Previcox) is a nonsteroidal anti-inflammatory drug of the COX-2 inhibitor (coxib) class, currently approved for use in dogs and horses. Firocoxib was the first COX-2 inhibitor approved by the U.S. Food and Drug Administration for horses. Firocoxib is not intended or approved for use in human medicine.