Hypersensitivity. HTN, bradycardia, urinary retention, ischaemic heart disease, CHF, cardiac conduction disturbances, narrow angle glaucoma, serious obliterative blood vessel disease, cerebrovascular occlusions & vessel spasms, aortic aneurism, proliferative diabetic retinopathy, thyrotoxicosis, pheochromocytoma, severe renal insufficiency (CrCl <30 mL/min) & serious prostate disorder.