Modalities

Ketamine Routes of Administration

Different delivery routes produce different blood-level curves — and different experiences, costs, and safety profiles.

Written by: Ira ZootMedical review status: Not yet clinically reviewed.Last updated: June 4, 2026Evidence: Educational synthesis of clinical pharmacology literature

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

Quick answer

Which route is 'best'?

There is no single best route. IV is the most controllable and best-studied; esketamine is the only FDA-approved option; sublingual programs offer accessibility. The right choice depends on diagnosis, history, and goals — a conversation for your clinician, not the internet.

Compare each route

IV Infusion

The reference standard. 100% bioavailability, fully titratable, clinic-only.

Intramuscular (IM)

Single injection, ~93% bioavailable, less common but cost-effective.

Intranasal Esketamine (Spravato)

The only FDA-approved formulation, REMS-restricted clinic delivery.

Sublingual Troches & Lozenges

~30% bioavailable, often used in telehealth and KAP programs.

Oral Ketamine

Lowest bioavailability (~17%), longer-acting metabolites, niche use.

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.