Ketamine Dosage Guide: Ranges, Forms, and How Doses Are Set

There is no single "correct" ketamine dosage. The right dose depends on the form of ketamine used, the condition being treated, your body weight, prior response, and how closely you can be monitored. Clinicians typically start low and adjust over a series of sessions rather than aiming for one fixed number. Because dose interacts directly with safety and effect, ketamine treatment is individualized and prescriber-directed—the ranges below describe what published protocols and clinical practice commonly use, not a recommendation for any one person.

How ketamine dosage is set

Ketamine dosage is usually expressed in milligrams per kilogram of body weight (mg/kg) for injected forms, or as a fixed milligram amount for oral and intranasal products. Several factors shape the final number a clinician chooses:

• Route of administration. Intravenous (IV) and intramuscular (IM) ketamine bypass the gut, so far less drug is needed than with oral dosing, where most of the dose is broken down before reaching the bloodstream.
• Indication. Doses used for mood conditions are generally lower ("subanesthetic") than those used for anesthesia or sedation.
• Body weight and physiology. Weight-based dosing accounts for size, but age, liver function, and other medications also matter.
• Prior response and tolerability. Clinicians often titrate—raising or lowering the dose between sessions based on benefit and side effects such as dissociation, nausea, or blood pressure changes.

Differences in how the body absorbs and clears ketamine across these routes are described in more detail under pharmacokinetics.

Typical ranges by form

The table below summarizes ranges commonly cited in clinical literature for subanesthetic, mental-health-oriented use. Anesthetic dosing is substantially higher and is outside the scope of this guide.

Form / route	Commonly cited range	Notes
Intravenous (IV) infusion	~0.5 mg/kg over ~40 minutes	The most-studied protocol for depression; given in a monitored setting.
Intramuscular (IM)	~0.5–1 mg/kg	Faster to administer than IV; absorption is less controlled.
Intranasal esketamine (Spravato)	56 mg or 84 mg fixed doses	FDA-approved; given in-clinic with post-dose observation.
Oral / sublingual lozenges (compounded)	Varies widely (tens to a few hundred mg)	Lower bioavailability means larger milligram amounts; used in some at-home programs.

These figures are illustrative. The actual dose, frequency, and number of sessions are set by a prescriber. You can compare delivery methods side by side under comparisons.

Why oral doses look so much higher

Swallowed ketamine passes through the liver before entering general circulation, where much of it is metabolized—a process called first-pass metabolism. Sublingual (under-the-tongue) absorption recovers some of that loss, but oral and sublingual bioavailability is still considerably lower than IV. That is why an oral lozenge may contain many times the milligrams of an IV dose yet produce a milder, slower effect.

Induction versus maintenance

Many protocols separate an initial "induction" phase—a cluster of sessions over a few weeks—from a less frequent "maintenance" phase for people who respond. Dose may stay similar between phases while the spacing changes, or the dose may be adjusted. Studies suggest response and durability vary widely between individuals, which is one reason structured follow-up is built into most programs. The mechanics of these schedules are covered under protocols.

Dose, side effects, and monitoring

Higher ketamine doses are more likely to produce dissociation, sedation, elevated heart rate and blood pressure, nausea, and temporary changes in coordination. Because of this, in-clinic dosing includes vital-sign monitoring, and at-home programs typically require a quiet setting, a sober support person, and a check-in process. Ketamine is not appropriate for everyone—uncontrolled high blood pressure, certain heart or psychiatric conditions, pregnancy, and a history of ketamine misuse are among the situations that may rule it out or require extra caution. Review safety considerations and at-home monitoring expectations before starting.

Questions to bring to your prescriber

1. What form and dose are you recommending for my situation, and why?
2. How will we know if the dose should be increased, decreased, or stopped?
3. How many sessions are planned, and how far apart?
4. What side effects are expected, and what should prompt a call?
5. How will my vital signs and overall response be tracked?

Getting clear answers helps you understand the plan and spot when something needs adjusting.

This article is patient education and not medical advice. Ketamine dosing must be determined and supervised by a qualified clinician who knows your full medical history. Do not start, stop, or change any treatment based on this page alone.

Frequently Asked Questions

What is a typical ketamine dose for depression?

The most-studied protocol uses an intravenous infusion of about 0.5 mg/kg over roughly 40 minutes in a monitored setting. Intranasal esketamine (Spravato) uses fixed 56 mg or 84 mg doses. Actual dosing is individualized by a prescriber.

Why are oral ketamine doses higher than IV doses?

Swallowed ketamine undergoes first-pass metabolism in the liver, so much of it is broken down before reaching the bloodstream. Oral and sublingual forms therefore use far more milligrams than IV to achieve a comparable—though usually milder and slower—effect.

Is ketamine dosed by body weight?

Injected forms (IV and IM) are commonly dosed in mg/kg, so weight is a factor. Intranasal esketamine and many compounded products use fixed milligram amounts. Clinicians also adjust based on response, tolerability, and other health factors.

Can I adjust my own ketamine dose?

No. Dose changes should be made only by your prescriber. Higher doses raise the risk of dissociation, sedation, and cardiovascular effects, so any adjustment belongs in a supervised, monitored plan.