Management of Methamphetamine Intoxication

Immediate Pharmacological Management

The American Heart Association recommends administering benzodiazepines as the cornerstone of therapy for all sympathomimetic manifestations including agitation, hypertension, tachycardia, and psychosis 1, 2, 3
Benzodiazepines work by addressing both central and peripheral manifestations of acute intoxication through their anxiolytic and muscle relaxant properties 1
Combining benzodiazepines with nitroglycerin is recommended for enhanced control of hypertension and tachycardia when benzodiazepines alone are insufficient 1, 2, 3

The American College of Cardiology advises never to administer beta-blockers in acute methamphetamine intoxication showing signs of euphoria, tachycardia, or hypertension, as they cause unopposed alpha-adrenergic stimulation, worsening coronary vasospasm and potentially precipitating myocardial infarction 1, 2, 3, 4

The American Heart Association recommends obtaining immediate 12-lead ECG upon presentation to evaluate for ischemia, arrhythmias, or ST-elevation, and measuring cardiac biomarkers to assess for myocardial injury 1, 2
For chest pain with suspected coronary vasospasm, administering sublingual nitroglycerin or intravenous calcium channel blockers is recommended as first-line therapy 2, 3

Patients with ECG changes and normal initial cardiac biomarkers require monitored observation for 9-24 hours, as most methamphetamine-related cardiac complications occur within this timeframe 2

For temperature >40°C with continued agitation despite maximal benzodiazepine sedation, proceeding immediately to intubation is recommended, using nondepolarizing paralytic agents and initiating aggressive cooling measures 2, 3

Mortality in severe sympathomimetic toxicity with hyperthermia approaches 11%, with significant morbidity from rhabdomyolysis, renal failure, seizures, and disseminated intravascular coagulation 2