How Much Ketamine is Used in Therapy? Dosages and Safety Explained

Typical Ketamine Dosages in Therapy

The amount of ketamine used in therapy depends on the method of administration. While there are standard ranges based on clinical research, each treatment is personalized.

IV Infusions

The most common protocol for mental health uses 0.5 mg per kilogram of body weight, delivered over a 40-minute infusion. This is considered the “standard research dose” and is often used as the starting point in clinical practice.

Intramuscular (IM) Injections

For intramuscular injections, the dose is often similar to IV infusions but may be slightly higher since absorption differs. These treatments are generally shorter in duration but still require careful monitoring.

Oral or Sublingual Lozenges

Ketamine lozenges taken orally or dissolved under the tongue typically range from 100 to 300 mg per session. Because absorption varies between individuals, providers may adjust the amount over time.

Spravato (Esketamine) Nasal Spray

Spravato, the FDA-approved intranasal form of esketamine, is given in fixed doses of 56 mg or 84 mg per treatment. Unlike IV ketamine, Spravato dosing is standardized and administered only in certified clinics.

Factors That Affect Ketamine Dosage

There is no one-size-fits-all amount of ketamine used in therapy. Multiple factors influence how much is given and how effective it will be.

Patient Weight and Metabolism

Because IV ketamine is dosed by body weight, a patient’s size directly affects the calculated amount. Individual metabolism also plays a role in how quickly the body processes the medication.

Condition Being Treated

Dosing for depression or PTSD may differ from dosing for chronic pain. In some cases, pain management requires higher or more frequent doses compared to psychiatric conditions.

Route of Administration

IV, IM, oral, and intranasal methods each deliver ketamine differently. Dosage ranges shift depending on how the body absorbs the medication.

Tolerance and Response Over Time

Some patients respond strongly to lower doses, while others need gradual increases to achieve relief. Providers track response and adjust treatment accordingly.

Why Doses Differ Across Patients

Patients often wonder why one person receives a certain dose while another gets something different. The reason is personalization.

Balancing Benefits and Side Effects

Providers aim to use the lowest effective dose to maximize symptom relief while minimizing potential side effects such as nausea, dizziness, or dissociation.

Starting Low, Adjusting Higher

It’s common to begin with a lower dose and increase gradually if needed. This careful approach ensures patient comfort and reduces risks.

Maintenance-Level Doses

After completing the initial induction phase, some patients require booster sessions. These maintenance treatments often use lower or less frequent doses than the induction series.