Alcohol and Ketamine Therapy: What to Know Before and After a Session

Holiday season brings parties, toasts, and plenty of questions about what is safe during treatment. When it comes to ketamine and alcohol, the answer is simple: they do not mix. This guide explains why, what the timing looks like around a session, and what to do if you slip up.

In short: Alcohol and ketamine both slow the central nervous system, and together they can increase sedation and, in serious cases, slow breathing. Do not drink on the day of a session, and avoid alcohol afterward until your care team says it is okay. For any window beyond that, follow your prescriber's instructions.

Why Don't Alcohol and Ketamine Mix?

Both alcohol and ketamine act as central nervous system (CNS) depressants in their own ways, so combining them stacks the effects. The FDA prescribing information for ketamine (Ketalar) warns that CNS depressants, including alcohol, may result in profound sedation, respiratory depression, coma, and death, and it calls for close monitoring when they are combined. The label for Spravato (esketamine) likewise states that using CNS depressants such as alcohol alongside the medication may increase sedation.

In plain terms, a drink that feels harmless on its own can have a much larger effect when ketamine is in your system. You may be sleepier, less coordinated, and less able to notice when something is wrong.

Why Does This Matter More for At-Home Ketamine Therapy?

In a clinic, staff watch your breathing, blood pressure, and alertness throughout. At home, your safety net is your own preparation and your adult chaperone. That makes the margin for error smaller, and it is why a session is never the time to test how alcohol affects you.

Alcohol also blurs the picture. If you feel unusually drowsy, confused, or unwell, it becomes harder for you or your chaperone to tell whether it is the medication, the alcohol, or a combination. Keeping alcohol out of the equation keeps the situation readable.

Can You Drink Before a Ketamine Session?

Not on the day of your session. Almadelic's session preparation guide asks you to fast for 4 to 6 hours beforehand, and drinking would defeat that preparation as well as raise the sedation risk. Clinics take this seriously: Northwestern Medicine's patient guidance states that arriving intoxicated means you will not receive treatment.

None of the sources we reviewed sets a specific number of hours or days to avoid alcohol before a session beyond that. Because protocols differ, ask your care team what applies to you and follow it exactly.

How Long Should You Wait to Drink After Ketamine Treatment?

The documented floor is the rest of the day. Northwestern Medicine advises avoiding alcohol for the remainder of the day after treatment, and the Spravato label tells patients not to engage in hazardous activities until the next day after a restful sleep. Almadelic's preparation guide also recommends skipping alcohol in the hours after a session so your mind has space to process the experience.

A drink to unwind after an intense session may feel natural, but it is the moment when the body is still recovering. Treat the evening as rest and integration time instead. If you want a firm answer about when drinking is safe again, ask your care team. They know your dose and your history.

Does Alcohol Affect Whether You Can Do Ketamine Therapy at All?

It can. Northwestern Medicine notes that uncontrolled alcohol use rules out treatment, and the Spravato label advises careful consideration before use in people with a history of substance use disorder, including alcohol. That does not mean everyone who drinks is excluded. It means your drinking habits are part of the screening conversation, and honest answers help your clinician decide what is safe for you.

What Should You Do if You Already Had a Drink?

Do not take your dose. Contact your care team and reschedule. Being upfront is the safest move, and the right call is almost always to wait.

If you have already taken ketamine and have had alcohol, tell your chaperone right away. Call 911 if someone has trouble breathing or cannot be woken.

Planning Ahead for the Holidays

The simplest strategy is to plan around the calendar. Schedule sessions away from parties and gatherings, line up non-alcoholic options for yourself, and let your care team know about upcoming events so timing can be adjusted. To learn more about our approach, visit the ketamine therapy hub, or schedule a free consultation to ask about your own situation.

Medical Disclaimer: This article is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Combining alcohol with ketamine can be dangerous. Always follow your prescriber's instructions, and never start, stop, or change any medication without consulting a qualified healthcare provider. If you or someone else is in danger, call 911. If you are in crisis, call or text 988.

Sources

1. U.S. Food and Drug Administration. KETALAR (ketamine hydrochloride) Prescribing Information, 2025. https://www.accessdata.fda.gov/drugsatfda_docs/label/2025/016812s056lbl.pdf
2. U.S. Food and Drug Administration. SPRAVATO (esketamine) Nasal Spray Prescribing Information, 2025. https://www.accessdata.fda.gov/drugsatfda_docs/label/2025/211243s016lbl.pdf
3. Northwestern Medicine. "Ketamine Treatment" patient education handout. https://www.nm.org/-/media/northwestern/resources/patients-and-visitors/patient-education/medication/northwestern-medicine-ketamine-treatment.pdf