Piroxicam pharmacokinetics in man: aspirin and antacid interaction studies.

Pharmacokinetic studies with piroxicam, a nonsteroidal antiinflammatory agent, have been carried out following the administration of single and multiple oral doses. A plasma half-life of approximately 45 hours is observed, permitting the use of single daily doses in therapy. Enterohepatic recirculation of drug is suggested by the presence of multiple peaks in plasma concentration curves. Piroxicam is highly bound to serum proteins. The absorption and disposition of piroxicam are unaffected by the concomitant administration of aspirin and antiacids. Salicylate plasma levels are similarly unaffected by piroxicam administration.