Is Ketamine Therapy Legal? What the Law Actually Says

Short answer: Yes. Ketamine therapy is legal in the United States. Ketamine is a medication the FDA approved decades ago, and it is legal for a licensed physician to prescribe it off-label to treat depression and other conditions. Its cousin esketamine, sold as Spravato, is FDA approved specifically for treatment-resistant depression. Here is what the law actually says, in plain terms.

Ketamine is a legal, approved medication

Ketamine has been an FDA-approved medication since 1970, originally as an anesthetic, and it is used every day in hospitals and operating rooms across the country. It is classified as a Schedule III controlled substance, which means it has recognized medical uses and is legal to prescribe, while still being regulated to prevent misuse. In other words, ketamine is not an experimental or underground drug. It is an established medicine used within a clear legal framework.

What "off-label" means, and why it is normal

When you read that ketamine is used off-label for depression, that simply means the FDA approved it for one use (anesthesia) and doctors also prescribe it for another (depression) based on strong clinical evidence. Off-label prescribing is legal, common, and a routine part of medicine. A large share of prescriptions written in the United States are off-label. So when a clinic offers IV ketamine for depression, it is practicing medicine in a well-established and lawful way, not bending any rules.

Where Spravato fits in

There is also a version with full, on-label FDA approval for mental health. In 2019 the FDA approved esketamine, a nasal spray derived from part of the ketamine molecule and sold as Spravato, specifically for treatment-resistant depression, and later for depressive symptoms with suicidal thoughts. Spravato is administered in a certified clinic under a federal safety program that requires monitoring after each dose. You can read more in our guide to ketamine versus Spravato.

Legal is not the same as unsupervised

The important distinction is not whether ketamine is legal, but how it is used. Because it is a controlled substance with real effects, it should always be prescribed and administered under qualified medical supervision, with proper screening and monitoring. That is exactly the setting that keeps treatment both lawful and safe. Ketamine obtained or used outside of medical care is a different matter entirely and carries real risks.

What this means at a licensed clinic

At a properly run clinic, a physician evaluates whether you are an appropriate candidate, oversees dosing, and monitors you throughout. That medical oversight is what distinguishes legitimate ketamine therapy from anything else. You can explore more foundational questions in our Ketamine 101 articles.

This article is for educational purposes only and is not legal or medical advice. Regulations can vary and change over time.

The bottom line

Ketamine therapy is legal in the United States. Ketamine is an FDA-approved, physician-prescribed medication, using it off-label for depression is a lawful and common practice, and Spravato is fully FDA approved for treatment-resistant depression. The key is receiving it under proper medical supervision. If you want to understand your options, call us at (310) 280-4440.

Frequently asked questions

Is ketamine therapy legal in the United States? Yes. Ketamine is an FDA-approved medication and a Schedule III controlled substance that licensed physicians can legally prescribe, including off-label for depression. Spravato, a related nasal spray, is fully FDA approved for treatment-resistant depression.

What does off-label mean for ketamine? It means the FDA approved ketamine for anesthesia, and doctors also prescribe it for depression based on clinical evidence. Off-label prescribing is legal and common throughout medicine.

Is ketamine a controlled substance? Yes, it is a Schedule III controlled substance. That means it has accepted medical uses and can be legally prescribed, while remaining regulated to reduce the risk of misuse.

Is IV ketamine or Spravato the FDA-approved one? Spravato (esketamine) has specific FDA approval for treatment-resistant depression. IV ketamine is FDA approved as an anesthetic and is used off-label, and legally, for depression.