, nightmares , and obsessive-compulsive symptoms have been reported rarely. Cardiovascular side effects have frequently included tachycardia , hypertension , and hypotension . Palpitation , AV block , and myocardial infarction have also been reported. Ventricular tachycardia , angina pectoris , premature atrial contractions , T wave inversions, ventricular extrasystoles , syncope