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Safety Center

Potential Side Effects of Ketamine Therapy

Most side effects are transient and resolve within hours.

Written by: Ira ZootMedically reviewed by: Ketalux Clinical Review PanelLast updated: June 6, 2026Evidence: FDA esketamine labeling; clinical safety reviews
Quick answer
What are the most common side effects?
Transient blood pressure and heart rate elevation, dissociation, nausea, dizziness, blurred vision, headache, and post-session fatigue. Most resolve within 1–2 hours of session end. Persistent effects warrant a call to your prescriber.

Common (most sessions)

  • Dissociation during the active phase
  • Transient BP / heart rate rise
  • Mild nausea
  • Dizziness or unsteadiness
  • Post-session fatigue (2–6 hours)

Less common

  • Headache
  • Vivid dreams the night of
  • Brief emotional reactivity in the 24–48 hours after
  • Mild urinary urgency (rare in therapeutic dosing)

Rare / serious

  • Severe BP elevation requiring intervention
  • Prolonged dissociation or confusion
  • Worsening mood or suicidal ideation
  • Allergic reaction

Any of the rare events should prompt immediate clinic contact.

Related reading

Educational content only. Not medical advice. Discuss any treatment decisions with a qualified clinician.

About the author
Ira Zoot

Independent publisher and editor of Ketalux, based in Chicago, Illinois. Ira commissions, edits, and reviews every article on the site and believes ketamine therapy — used responsibly — offers real hope for people living with depression, anxiety, PTSD, and chronic pain. Contact: ira@idigits.com.

Educational use only. The content on this page is provided for general educational purposes and does not constitute medical advice, diagnosis, or treatment. Ketamine and related therapies carry risks and are appropriate only under qualified medical supervision. Always consult a licensed healthcare professional about your individual situation. Information may change as research evolves.