To control excessive sinus tachycardia or ventricular arrhythmias caused by catecholamine excess (eg, theophylline or caffeine), sympathomimetic drug intoxication (eg, amphetamines, pseudoephedrine, or cocaine), excessive myocardial sensitivity (eg, chloral hydrate, freons, or chlorinated and other hydrocarbons), or thyrotoxicosis.
To control hypertension in patients with excessive beta1-mediated increases in heart rate and contractility; used in conjunction with a vasodilator (eg, phentolamine) in patients with mixed alpha- and beta-adrenergic hyperstimulation.
To raise diastolic blood pressure in patients with hypotension caused by excessive beta2-mediated vasodilation (eg, theophylline or metaproterenol).
May ameliorate or reduce beta-adrenergic–mediated electrolyte and other metabolic abnormalities (eg, hypokalemia, hyperglycemia, and lactic acidosis).
Serotonin syndrome (See Hyperthermia).