Hypersensitivity w/ Na sulfite. Patients w/ cocaine poisoning; ventricular tachycardia; atherosclerosis; heart disease; bradycardia; coronary, mesenteric, peripheral vascular thrombosis; hypotension due to MI; Prinzmetal angina. Do not use as substitute for blood or fluids. May cause an excessive increase in BP & acute pulmonary edema action, arrhythmia, cardiac arrest may occur. Frequently check BP & administration rate to avoid high increase in BP. May cause remarkable peripheral & internal vasoconstriction, decrease in renal perfusion & urea emission, decrease in blood vol despite normal BP, tissue hypoxia, metabolic acidosis w/ continuous use w/o replacement for maintaining of BP; consider using w/ blood vol replacement. Lactation. Elderly.