Side effects of oxaprozin (Daypro) include: nausea, vomiting, diarrhea, constipation, gas, bloating, stomach pain, heartburn, dizziness, ringing in the ears, runny nose, an increase in sweat, dry mouth, headache or feeling nervous. Oxaprozin can cause potentially fatal side effects. Alert your doctor immediately if you notice any of the following: exhaustion or weakness, nausea, vomit that is bloody or resembles coffee grounds, bloody, tarry, black or clay-colored stools, coughing up blood, yellowed eyes or skin, itchiness, skin blisters or rash with fever, stomach pain, flu-like symptoms, swollen feet, legs, hands or arms, weight gain that is unusual, dark, scant or absent urine, low-grade fever, lack of appetite, bruising, numbness or tingling. Call 911 if you experience chest pain, problems with breathing, balance, speech or vision, swollen throat or face, hives or feeling weak on one side or part of the body.
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