Nausea, dizziness & somnolence. HTN, palpitations, tachycardia, arrhythmia; dizziness, somnolence, headache, trembling, involuntary muscle contractions, paraesthesia, tinnitus, ataxia, convulsions; psychiatric disorders; blurred vision; dyspnea; GI disorders; increased hepatic transaminases; sweating, pruritus, rash, urticaria; albuminuria, dysuria, urinary retention; shivers, hot flushes, thoracic pain.