Patients w/ history of serious hypersensitivity reactions & in those undergoing desensitization therapy. Not to be used in markedly reduced performance of the heart, labile or secondary (organically induced) high BP, unstable angina pectoris, impulse conductions disturbance in the heart (complete bundle branch block), final stages of peripheral artery disease, impaired renal function (serum creatinine conc >1.8 mg/dL or CrCl <30 mL/min), recent heart attack (<6 mth old), tendency to drop in BP lowering drugs (α1 receptor antagonists). Close medical surveillance in DM patients w/ pronounced fluctuations in blood sugar levels & in the event of strict fasting. Discontinue use of diuretics prior to initiating the treatment. Patients w/ personal or familiar history of psoriasis. Treatment should not be discontinued abruptly but must be gradually tapered for few days in patients w/ concomitant CAD (angina pectoris). Regular medical surveillance in the treatment of HTN. Perform eye exam regularly at 6 mth intervals during treatment. Carefully monitor patients w/ mild to moderate occlusive vascular disease during initiation of therapy. Avoid use in patients w/ severe occlusive vascular disease particularly w/ rest pain. Should only be used in patients w/ COPD w/ bronchospastic component not receiving oral or inhaled medication. Closely monitor patients during initiation & up-titration of dose. Reduce dose if any evidence of bronchospasm is observed; pulse rate decreases to <55 bpm. May obscure the symptoms of thyrotoxicosis. Patients suspected of having pheochromocytoma; Prinzmetal's variant angina. May exacerbate symptoms in patients suffering from peripheral circulatory disorders (Raynaud's phenomenon). Patients undergoing general surgery. May induce bradycardia. Carefully monitor ECG & blood in patients receiving concomitant therapy w/ Ca channel blocker (eg, verapamil or diltiazem), or other antiarrhythmic drugs. Monitor decreasing heart rate, negative inotropism & delayed stimulus conductions w/ anesth drugs. May masked or attenuated the signs of hypoglycaemia. Regularly monitor blood sugar in diabetic patients. May impair the ability to drive or operate machinery. Sharp drop of BP may occur in elderly & patients already taking diuretics after administration of 1st dose.