Hypersensitivity. Patients w/ cocaine poisoning; ventricular tachycardia; atherosclerosis; heart disease; bradycardia; coronary, mesenteric, peripheral vascular thrombosis; hypotension due to MI; Prinzmetal angina. May cause an excessive increase in BP & acute pulmonary edema action, arrhythmia, cardiac arrest. Check the BP & administration rate while injecting. Use α blocker (phentolamine) if excessive rise in BP. Avoid administering for pregnant or possible pregnant women. Lactation. Elderly.