Bradycardia, CHF, intensification of AV block, hypotension, paresthesia of hands, thrombocytopenic purpura, arterial insufficiency, usually of the Raynaud type; light-headedness, mental depression, manifested by insomnia, lassitude, weakness, fatigue, catatonia; visual disturbances, hallucinations, vivid dreams, acute reversible syndrome characterized by disorientation for time & place, short-term memory loss, emotional liability, slightly clouded sensorium, & decreased performance on neuropsychometrics; nausea, vomiting epigastric distress, abdominal cramping, diarrhea, constipation, mesenteric, arterial thrombosis, ischemic colitis; hypersensitivity reactions including anaphylactic/anaphylactoid reactions, pharyngitis & agranulocytosis, erythematous rash, fever combined w/ aching & sore throat, laryngospasm, resp distress; bronchospasm; agranulocytosis, nonthrombocytopenic purpura, thrombocytopenic purpura; SLE; SJS, TEN, dry eyes, exfoliative dermatitis, erythema multiforme, urticaria, alopecia, SLE-like reactions, & psoriasiform rashes; male impotence, Peyronie's disease.