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; consider using w/ blood vol replacement. Lactation. Elderly.