Nausea, dyspepsia, GI pain & bleeding; abdominal discomfort, hematemesis, gastritis, esophagitis, diarrhea, eructation, constipation, flatulence, fullness, melena, peptic ulcer, nonpeptic GI ulceration, rectal bleeding, ulcerative stomatitis. vomiting, hemorrhage, perforation pancreatitis; anxiety, drowsiness, dizziness, headache, sweating, dry mouth, nervousness, paresthesia, functional disorders, abnormal thinking, depression, euphoria, convulsions, excessive thirst, inability to concentrate, insomnia, malaise, fatigue, stimulation, vertigo, abnormal taste & vision, optic neuritis, myalgia, abnormal dreams, hallucinations, hyperkinesias, hearing loss, tinnitus, aseptic meningitis, psychotic reactions, nephrotoxicity including urinary frequency, oliguria, acute renal failure, hyponatremia, hyperkalemia, hemolytic uremic syndrome, flank pain (w/ or w/o hematuria), raised serum urea & creatinine, interstitial nephritis, urinary retention, nephritic syndrome; flushing bradycardia, pallor, purpura, thrombocytopenia, neutropenia, agranulocytosis, aplastic or hemolytic anemia, HTN, palpitations, chest pain, dyspnea, asthma, pulmonary edema; pruritus, urticaria, skin photosensitivity, Lyell's syndrome, SJS, exfoliative dermatitis, maculopapular rash; anaphylaxis, bronchospasm, laryngeal edema, hypotension, flushing & rash.