- question: "What are the most common side effects of ketamine therapy?

The most common side effects during and shortly after ketamine therapy include nausea (occurring in roughly 20 to 30 percent of patients), dizziness and lightheadedness, temporary increases in blood pressure and heart rate, dissociation (which is expected at therapeutic doses), fatigue and drowsiness, headache, and blurred vision. These effects are typically transient and resolve within a few hours of treatment. Nausea can be managed with anti-nausea medication such as ondansetron taken before the session. Blood pressure elevations are monitored during in-clinic sessions and rarely require intervention. Most patients find that side effects are manageable and diminish with subsequent sessions as they become accustomed to the experience. Our [side effects guide](/questions/ketamine-side-effects-guide/) covers each effect in more detail.

Is ketamine therapy addictive?

At the controlled, sub-anesthetic doses used in therapeutic settings with medical supervision, the risk of addiction is considered low. Ketamine does have abuse potential — it is a Schedule III controlled substance — and recreational use at higher doses can lead to psychological dependence. However, the therapeutic context is fundamentally different from recreational use: doses are lower, frequency is controlled, and treatment is supervised by a medical professional. Patients with a history of substance use disorder should discuss this openly with their provider, as additional monitoring and safeguards may be warranted. Reputable providers control medication quantities and track usage carefully to minimize misuse risk.

Can ketamine therapy cause long-term side effects?

At therapeutic doses administered on a typical clinical schedule, serious long-term side effects are uncommon. The primary long-term concern documented in the medical literature involves urinary tract issues — chronic ketamine use at high doses (primarily in recreational users) can cause bladder inflammation, urinary frequency, and in severe cases, bladder damage. These problems are associated with daily, high-dose use far exceeding therapeutic protocols. Other potential long-term considerations include cognitive effects (generally not observed at therapeutic doses in clinical studies) and the possibility of tolerance requiring dose adjustments over time. Your provider should monitor you for any emerging concerns during maintenance treatment.

Who should not receive ketamine therapy?

Ketamine therapy is contraindicated for individuals with uncontrolled hypertension (because ketamine temporarily raises blood pressure), active psychotic disorders such as schizophrenia or schizoaffective disorder, active substance abuse disorder involving ketamine or similar substances, pregnancy, untreated hyperthyroidism, conditions involving elevated intracranial pressure, and certain serious cardiovascular conditions including unstable angina or recent heart attack. A thorough medical screening before treatment should identify any contraindications. Even if you have a condition on this list, discuss it with a knowledgeable provider — some conditions may be manageable with additional precautions rather than being absolute contraindications.

What happens if my blood pressure gets too high during a session?

Temporary blood pressure elevation is one of the most common cardiovascular effects of ketamine, typically peaking during the infusion and returning to baseline within 30 to 60 minutes after the session ends. In-clinic settings monitor blood pressure at regular intervals throughout treatment. If blood pressure rises above a predetermined threshold, the clinical team may slow or pause the infusion, administer an antihypertensive medication (such as clonidine or labetalol), or in rare cases, end the session early. For most patients, blood pressure increases are modest and clinically insignificant. Patients with a history of hypertension should have their blood pressure well-controlled before starting ketamine therapy.

Can I take ketamine therapy if I have anxiety about the experience?

Yes, and pre-treatment anxiety is extremely common. Many patients feel nervous before their first session, particularly about the dissociative effects. This anxiety usually decreases significantly after the first one or two sessions as you learn what to expect. Preparation helps enormously — understanding what dissociation feels like, having a comfortable environment, and trusting your provider all reduce anxiety. Some providers offer a lower initial dose for anxious patients to provide a gentler introduction. If you have a clinical anxiety disorder, ketamine may actually help treat it. Discuss your anxiety openly with your provider so they can adjust the approach to help you feel as comfortable as possible.

Is it safe to combine ketamine with my antidepressant medication?

Ketamine is generally considered safe to use alongside most common antidepressants including SSRIs (such as sertraline, escitalopram, and fluoxetine) and SNRIs (such as venlafaxine and duloxetine). However, there are important exceptions and nuances. Benzodiazepines may reduce ketamine's therapeutic efficacy, and some providers recommend skipping the benzodiazepine dose on treatment days. MAO inhibitors require caution due to potential interactions. Lamotrigine may interfere with ketamine's glutamate-mediated effects. Lithium levels should be stable and monitored. Always provide your ketamine provider with a complete and current list of all medications and supplements you take so they can assess for interactions. See our full guide on [ketamine with other medications](/questions/ketamine-with-other-medications/) for details.

What emergency protocols should be in place during treatment?

In-clinic settings should have blood pressure and heart rate monitoring equipment, pulse oximetry, emergency medications (including antihypertensives, benzodiazepines for severe anxiety, and anti-nausea medications), staff trained in basic life support or advanced cardiac life support, and a clear protocol for managing medical emergencies. For at-home treatment, your provider should give you an emergency phone number, clear instructions on when to call 911, guidance on what to do if you experience severe distress, and a requirement to have a sober treatment companion present who can call for help if needed. Ask your provider specifically about their emergency protocols before starting treatment.

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Ketamine Side Effects and Safety: Frequently Asked Questions

Name: Ketamine Path
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Common questions about ketamine therapy side effects, safety risks, contraindications, and how to minimize adverse effects during treatment.

February 23, 2026

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