What Are the Side Effects of Ketamine Therapy?

Short answer: Most side effects of ketamine therapy are mild, temporary, and fade soon after your session ends. The most common are a floating or dissociative feeling during treatment, mild nausea, dizziness, and a short-lived rise in blood pressure and heart rate. Serious problems are rare in a monitored setting. Here is an honest look at what to expect and how it is handled.

During the session

Ketamine produces its effects while it is in your system, so most sensations happen during treatment and taper off afterward. The most talked-about is dissociation, a dreamlike sense of feeling detached from your body or surroundings. For many people this is calming or even interesting, though it can feel unusual the first time. Other in-session effects can include dizziness, blurred or double vision, a floaty or heavy feeling, and sometimes mild anxiety as the experience begins. Because you are monitored throughout, staff can help you feel grounded if anything feels like too much.

Physical side effects

Ketamine can temporarily raise blood pressure and heart rate, which is one reason vital signs are checked during treatment. Some people feel nauseated, and occasionally vomit, which is why clinics often suggest a light stomach beforehand and can provide anti-nausea medication. Mild headache and drowsiness afterward are also possible. These effects are generally short-lived and settle within the same day.

After you leave

The most common lingering effects are simply feeling tired, a little foggy, or off-balance for the rest of the day. This is exactly why you should arrange a ride home and avoid driving or making big decisions until the next day. You can read more in our guide on driving after ketamine treatment. Most people feel back to baseline by the following morning.

What about longer-term concerns

It is worth being clear-eyed here. The bladder and urinary problems and cognitive effects sometimes linked to ketamine come from frequent, high-dose recreational misuse over long periods, not from the low, spaced-out doses used in a monitored medical course. That difference in dose and frequency is significant. Still, a responsible clinic tracks your response over time and adjusts care accordingly, and you should always report any new or lingering symptoms.

Who should take extra care

Ketamine is not right for everyone. Because it can raise blood pressure and heart rate, people with uncontrolled high blood pressure or certain heart conditions need careful evaluation, and there are other situations where it may not be appropriate. This is why proper medical screening comes first. You can learn more in our post on who is not a good candidate for ketamine therapy.

This article is for educational purposes only and is not medical advice. Discuss your health history and any side effects with a qualified provider.

The bottom line

For most people, ketamine therapy side effects are mild and pass quickly: some dissociation during the session, maybe nausea or dizziness, and a temporary bump in blood pressure, with tiredness afterward. Serious issues are uncommon when treatment is properly screened and monitored. If you would like to talk through what to expect, call us at (310) 280-4440.

Frequently asked questions

What are the most common side effects of ketamine therapy? A dissociative or floating feeling during the session, mild nausea, dizziness, blurred vision, and a temporary rise in blood pressure and heart rate. Tiredness afterward is common. Most effects fade the same day.

How long do ketamine side effects last? Most in-session effects wear off within an hour or two after treatment ends, and lingering tiredness or fogginess usually clears by the next morning.

Are there serious side effects? Serious side effects are rare in a monitored setting. The bladder and cognitive problems sometimes associated with ketamine come from frequent high-dose recreational misuse, not from low-dose supervised treatment.

Can side effects be managed during treatment? Yes. You are monitored throughout, vital signs are checked, anti-nausea medication is available, and staff can help you feel grounded if the experience feels intense.