Hypersensitivity eg, shock; anergia, fatigue, flushing, occasional chest pain, spasticity, syncope, w/drawal symptom; occasional HTN, exacerbation of HTN, hypotension, arrhythmia, palpitation & tachycardia; dizziness, headaches, tremor, occasional hyperkinesis, convulsion, migraine, exacerbation of migraine, contraction of involuntary muscle, sensory anomaly, stupor & vertigo; bellyache, constipation, diarrhea, dyspepsia, flatulence, dry mouth, nausea, vomiting & occasional dysphagia, melena & tongue edema; anorexia, anxiety, confusion, insomnia, nervousness, drowsiness, amnesia, depersonalization, depression, drug abuse & dependence, mood change, hallucinations, impotence, nightmares & abnormal thought; occasional anemia; occasional resp distress syndrome; proteinuria, dysuria, oliguria & urine retention; pruritus, rash, sweating & urticaria; hepatic dysfunction, wt loss, tinnitus, abnormal vision & chilling.