atenolol /aten″əlôl/ , a beta1 selective blocker. ▪ INDICATIONS: It is prescribed for the treatment of hypertension and to lower heart rate. ▪ CONTRAINDICATIONS: Sinus bradycardia, second- or third-degree atrioventricular block, cardiogenic shock, or cardiac failure prohibits its use. ▪ ADVERSE EFFECTS: Among the more serious adverse reactions are bradycardia, dizziness, and nausea.
