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Modalities

Oral Ketamine

When ketamine is swallowed, first-pass metabolism produces high levels of norketamine — a different pharmacological footprint.

Written by: Ira ZootMedical review status: Not yet clinically reviewed.Last updated: June 4, 2026Evidence: Synthesis of pharmacokinetic literature

This page has been written and edited by the publisher. It has not been reviewed by a licensed clinician.

Quick answer
When is oral ketamine used?
Most often for maintenance dosing in chronic pain, palliative care, or between psychiatric sessions when sublingual or in-clinic routes aren't practical. It is not a typical first-line psychiatric route.

Profile

  • Bioavailability: ~17% (extensive first-pass metabolism).
  • Onset: 30–60 minutes.
  • Duration: longer-acting, gentler peak.
  • Metabolite profile: high norketamine relative to other routes.

Strengths

  • Simple administration; no special equipment.
  • Smoother experience curve, less acute dissociation.
  • Useful in chronic pain and palliative contexts.

Trade-offs

  • Smallest evidence base for depression-specific outcomes.
  • Variable absorption with food and gut motility.
  • Take-home supply requires the same safeguards as sublingual.
Norketamine matters
Norketamine, the primary metabolite, has its own activity and may contribute to the analgesic effects seen in chronic pain. The psychiatric relevance is still being characterized.
About the author
Ira Zoot

Publisher and editor of Ketalux, based in Chicago, Illinois. Ira is a ketamine therapy patient, not a clinician. This is editorial review, not medical review: Ira is not a licensed clinician and does not provide diagnosis or medical care. Ketalux does not accept compensation from providers in exchange for favorable editorial coverage, evidence ratings, recommendations, patient referrals, or organic provider ranking. Read the full publisher disclosure →

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.