Can You Take Ketamine with Other Medications? Drug Interactions Explained

Can you take ketamine with other medications? In most cases, yes. The majority of prescriptions, including common antidepressants and blood pressure medications, are considered compatible with ketamine therapy. A smaller group of medications, such as benzodiazepines, lamotrigine, and MAO inhibitors, can change how ketamine works or add safety risks, so they call for a specific conversation with your provider before treatment starts. This guide breaks down the medication categories you are most likely to ask about, what the evidence suggests, and how to give your provider the full picture they need to keep you safe.

Medications That Are Generally Safe to Combine

SSRIs (Selective Serotonin Reuptake Inhibitors)

Examples: fluoxetine (Prozac), sertraline (Zoloft), escitalopram (Lexapro), paroxetine (Paxil), citalopram (Celexa)

SSRIs are the most commonly prescribed antidepressants, and many patients starting ketamine therapy are already taking one. The combination is generally considered safe, and most ketamine providers allow patients to continue their SSRI during treatment. Spravato (esketamine nasal spray) is specifically designed to be used alongside an oral antidepressant, including SSRIs. Some patients eventually work with their prescriber to taper off their SSRI if ketamine therapy provides enough benefit on its own, but this should always happen gradually and under medical supervision.

SNRIs (Serotonin-Norepinephrine Reuptake Inhibitors)

Examples: venlafaxine (Effexor), duloxetine (Cymbalta), desvenlafaxine (Pristiq)

Like SSRIs, SNRIs can generally be continued during ketamine therapy. They work through a different mechanism and do not appear to interfere with ketamine's therapeutic effects.

Bupropion (Wellbutrin)

Bupropion is commonly used alongside ketamine therapy without significant interaction concerns. Some providers note that its activating properties can complement ketamine's antidepressant effects.

Blood Pressure Medications

If you take medication for high blood pressure, continue taking it as prescribed. Since ketamine can temporarily raise blood pressure, your blood pressure medication provides an important safety buffer. See our guide on ketamine side effects and safety for more on cardiovascular considerations. Your provider should know which blood pressure medications you take and your typical readings.

Thyroid Medications

Thyroid medications like levothyroxine (Synthroid) can be continued without concern during ketamine therapy.

Statins and Cardiovascular Medications

Most cardiovascular medications do not interact with ketamine. Continue them as prescribed unless your ketamine provider or cardiologist advises otherwise. For additional medication-specific interaction checks, the Mayo Clinic Drugs & Supplements database is a helpful reference to review with your provider.

Medications That Require Discussion With Your Provider

Benzodiazepines

Examples: alprazolam (Xanax), lorazepam (Ativan), clonazepam (Klonopin), diazepam (Valium)

This is one of the most important interactions to discuss with your provider. Some research suggests benzodiazepines may reduce ketamine's therapeutic effectiveness, potentially by dampening the glutamate surge and neuroplastic effects that are central to how ketamine works. Providers handle this differently: some ask patients to skip their benzodiazepine on treatment days, some suggest gradually tapering benzodiazepines before starting ketamine therapy, and others allow continued use but monitor the treatment response closely.

Lamotrigine (Lamictal)

Lamotrigine, a mood stabilizer commonly used for bipolar disorder, has been shown in some studies to reduce the dissociative effects of ketamine. This could potentially affect the therapeutic response, though the evidence is mixed. Some providers adjust the timing of lamotrigine relative to ketamine sessions. Discuss this with your provider.

Opioid Medications

Examples: hydrocodone, oxycodone, morphine, fentanyl, tramadol

Both ketamine and opioids can affect respiratory function and consciousness, so combining them requires careful monitoring. Ketamine is also used in pain medicine alongside opioids, and experienced providers can manage the combination safely. If you take opioids for chronic pain, your ketamine provider needs to know the exact medications, doses, and schedule. Some patients find that ketamine therapy allows them to reduce their opioid doses over time, which should happen gradually under medical supervision. Read more in our guide to ketamine for chronic pain.

Stimulants

Examples: methylphenidate (Ritalin, Concerta), amphetamine/dextroamphetamine (Adderall), lisdexamfetamine (Vyvanse)

Stimulants and ketamine can both increase heart rate and blood pressure. The combination is not necessarily dangerous, but it requires attention to cardiovascular effects. Some providers recommend skipping the stimulant on treatment days, while others continue it with close monitoring. Discuss this with your provider.

Lithium

Lithium combined with medications that alter consciousness requires careful consideration. Most ketamine providers proceed with caution if you take lithium, monitoring closely for adverse effects. Lithium levels should be stable and within therapeutic range before starting ketamine therapy.

Muscle Relaxants and Sedatives

Examples: cyclobenzaprine (Flexeril), tizanidine (Zanaflex), zolpidem (Ambien)

These medications add sedation on top of ketamine's own sedating effects. Your provider may recommend skipping sedating medications on treatment days or adjusting timing to avoid overlapping sedation. Do not take sleep aids or sedatives the evening before a ketamine session without provider guidance.

Medications That Require Significant Caution

MAO Inhibitors (MAOIs)

Examples: phenelzine (Nardil), tranylcypromine (Parnate), selegiline (Emsam patch)

MAOIs can potentially amplify ketamine's cardiovascular effects, particularly blood pressure elevation. The combination requires careful evaluation and close monitoring. Some providers proceed with significant caution, while others treat it as a relative contraindication. This is a conversation that requires your provider's specific expertise.

Anesthetics and Sedatives for Surgery

If you are undergoing any surgical procedure while also receiving ketamine therapy, tell your anesthesiologist about your ketamine treatment. Anesthesiologists understand how ketamine interacts with other anesthetic agents, but they need complete information to plan your care safely.

Supplements and Over-the-Counter Products

Do not overlook supplements and over-the-counter products. Mention these to your provider:

• St. John's Wort: can interact with multiple medications and may affect ketamine metabolism
• Kava: can add sedation and may affect liver function
• Valerian root: adds sedation
• CBD/THC products: can interact with ketamine's effects on consciousness and may complicate the assessment of treatment response
• Alcohol: not a medication, but worth mentioning here. Avoid alcohol on treatment days and ideally for 24 hours before and after sessions
• Caffeine: high intake can increase anxiety and cardiovascular effects. Consider reducing caffeine on treatment days

According to MedlinePlus, patients should tell their care team about every prescription drug, over-the-counter product, and supplement they use, since combinations with certain substances can increase the risk of side effects.

The Critical Rule: Full Disclosure

The single most important thing you can do about medication interactions is give your ketamine provider a complete, honest list of everything you take. Do not leave anything out because you assume it is not relevant, because you feel embarrassed, or because you worry they will not prescribe ketamine if they know. Your provider needs the full picture to keep you safe. Withholding information does not protect you, it puts you at risk. Use the checklist below before your first appointment.

Medication Adjustments During Ketamine Therapy

As you progress through treatment, your overall medication needs may change. If ketamine significantly improves your depression, you may be able to reduce or taper off some psychiatric medications. If ketamine helps with pain, opioid doses may become adjustable. If anxiety improves, benzodiazepine reduction may become possible. All medication changes should happen under the guidance of the prescribing provider, gradually, and with close monitoring. Never stop a medication abruptly because you feel better. Rebound effects and withdrawal can be serious. Learn more about what to expect over time in our guide to ketamine discontinuation and tapering.

Working With Multiple Providers

Many ketamine patients have several healthcare providers: a primary care physician, a psychiatrist, a pain specialist, and now a ketamine provider. Coordinating between them ensures everyone knows your full medication list and can make informed decisions. Give each provider permission to communicate with the others about your care. Our guide on questions to ask a ketamine provider about continuity of care can help you find providers who coordinate well. This simple step can prevent medication conflicts and support the best possible outcomes. The Substance Abuse and Mental Health Services Administration (SAMHSA) recommends this kind of care coordination when patients are managing multiple medications across providers.