When viewing this topic in a different language, you may notice some differences in the way the content is structured, but it still reflects the latest evidence-based guidance.

Last reviewed: 16 Mar 2025
Last updated: 30 Oct 2024

Summary

Definition

History and exam

Key diagnostic factors

  • hypertension
  • tachycardia
  • chest pain
  • mydriasis
  • diaphoresis
  • tremulousness
  • agitation (mild to severe)
  • mood changes (e.g., irritability, euphoria, dysphoria, paranoia)
  • suicide ideation

Other diagnostic factors

  • anxiety (panic state: mild to severe)
  • drug-induced formication
  • previous hospitalization for medically supervised withdrawal
  • heat-related injuries (e.g., blisters, sores, and cuts on the mouth) or burns on the thumbs
  • nasal septum ulceration, perforation
  • focal neurologic abnormalities
  • seizure activity
  • loss of consciousness/altered consciousness
  • skin lesions (e.g., puncture marks, infections, erosions, necrosis)
  • dyspnea

Risk factors

  • adverse childhood events
  • history of polysubstance use
  • family history of substance use disorders
  • history of mental health disorder
  • male sex

Diagnostic tests

1st tests to order

  • urine toxicology ± gas chromatography/mass spectrometry testing
  • ECG

Tests to consider

  • chest x-ray
  • CT head
  • electroencephalogram
  • comprehensive blood panel
  • hepatitis serology
  • HIV serology

Treatment algorithm

Contributors

Authors

Steven B. Karch, MD, FFFLM, FCSFS

Consultant Cardiac Pathologist/Toxicologist (ret.)

Office of the Chief Medical Examiner

San Francisco

CA

Disclosures

SBK is an author of a number of references cited in this topic. SBK gives expert testimony and receives royalties from a textbook that he authored.

Kim Wolff, MBE, PhD

Professor of Analytical, Forensic, and Addiction Science, Director, King’s Forensics

Faculty Life Science and Medicine

King’s College London

London

UK

Disclosures

KW declares that she has no competing interests.

Peer reviewers

Andrew J. Saxon, MD

Professor

Department of Psychiatry and Behavioral Sciences

University of Washington School of Medicine

Seattle

WA

Disclosures

AS declares that he receives royalties from UpToDate, Inc.

Adam Bisaga, MD

Professor

Clinical Psychiatry

Columbia University College of Physicians and Surgeons

New York City

NY

Disclosures

AB declares that his research team and institution received funding and medication donations from Alkermes.

Christos Kouimtsidis, MBBS, MSc, MRCPsych, PhD

Consultant Psychiatrist and Honorary Senior Lecturer

Addictions, Alcohol Research

Institute of Psychiatry

King's College London

London

UK

Disclosures

CK declares that he has no competing interests.

Use of this content is subject to our disclaimer