Substrate of CYP 2C9. Two references consider it (probably) safe for use.

(To be edited, initial data ST OCT 04) Tablet; 20 mg/d. Analgesic with antipyretic och anti-inflammatory effects for short-time treatment of light to moderate pain Oxicam derivative extensively metabolized (CYP 2C9), mainly to the 5-hydroxyderivative. Inhibitor of CYP 2C9. South African list: use with care. French list: authorized