Known hypersensitivity to piroxicam or to any of the excipients of Feldene Flash. Active peptic ulcerations or history of recurrent ulceration. The potential exists for cross-sensitivity to acetylsalicylic acid and other nonsteroidal anti-inflammatory drugs (NSAIDs). Feldene Flash should not be given to patients in whom acetylsalicylic acid and other NSAIDs induce the symptoms of asthma, nasal polyps, angioedema or urticaria. Patients with severe renal, hepatic and heart failure.