Can You Take Ketamine with Other Medications? Drug Interactions Explained

A Question You Should Always Ask

If you are taking other medications — and most people considering ketamine therapy are — understanding how ketamine interacts with them is essential. The good news is that ketamine can be safely combined with most medications. But there are important interactions and considerations that both you and your provider need to be aware of.

This guide covers the most common medication categories and their interactions with ketamine therapy. It is not a substitute for a conversation with your provider, but it gives you a foundation for asking the right questions.

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. Most ketamine providers allow patients to continue their SSRI while receiving ketamine treatment.

In fact, 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 sufficient benefit, but this should always be done 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 different mechanisms 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 bupropion's activating properties can complement ketamine's antidepressant effects.

Blood Pressure Medications

If you are taking medication for high blood pressure, continue taking it as prescribed. Since ketamine can temporarily elevate blood pressure, your blood pressure medication provides an important safety buffer. See who should not take ketamine for more on cardiovascular considerations. Your provider should be aware of 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.

Medications That Require Discussion

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 that benzodiazepines may reduce the therapeutic effectiveness of ketamine, potentially by dampening the glutamate surge and neuroplastic effects that are central to ketamine's mechanism of action.

Providers handle this in different ways:

• Some ask patients to skip their benzodiazepine on the day of treatment
• Some suggest gradually tapering benzodiazepines before starting ketamine therapy
• Others allow continued use but monitor the treatment response closely

Do not stop taking a benzodiazepine abruptly — this can cause dangerous withdrawal symptoms, including seizures. Any changes to benzodiazepine use should be discussed with your prescribing provider and done gradually.

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 recommend adjusting 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. Patients using opioids for chronic pain should discuss this carefully with their provider, so combining them requires careful monitoring. However, ketamine is actually used in pain medicine alongside opioids, and the combination can be managed safely by experienced providers.

If you are taking 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 be done gradually under medical supervision.

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 the day of ketamine treatment, 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 will proceed with caution if you are on lithium, closely monitoring for any 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 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 on 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 will proceed with significant caution, while others consider it a relative contraindication. This is a conversation that requires your provider's specific expertise.

Certain Anesthetics and Sedatives

If you are undergoing any surgical procedure while also receiving ketamine therapy, your anesthesiologist needs to know about your ketamine treatment. The interactions between ketamine and other anesthetic agents are well-understood by anesthesiologists, but they need complete information to plan your care safely.

Supplements and Over-the-Counter Products

Do not overlook supplements and over-the-counter medications. 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 caffeine intake can increase anxiety and cardiovascular effects. Consider reducing caffeine on treatment days

The Critical Rule: Full Disclosure

The single most important thing you can do regarding medication interactions is to give your ketamine provider a complete, honest list of everything you take. This includes:

• All prescription medications
• Over-the-counter medications (pain relievers, allergy medications, sleep aids)
• Supplements and vitamins
• Herbal preparations
• Recreational substances (including alcohol, cannabis, and any others)

Do not leave anything out because you think it is not relevant, because you are embarrassed, or because you assume 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.

Medication Adjustments During Ketamine Therapy

As you progress through ketamine 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 be adjustable
• If anxiety improves, benzodiazepine reduction may become possible

All medication changes should be done under the guidance of the prescribing provider, gradually, and with close monitoring. Never stop a medication abruptly because you are feeling better — rebound effects and withdrawal can be serious.

Working with Multiple Providers

Many ketamine patients have multiple healthcare providers — a primary care physician, a psychiatrist, a pain specialist, and now a ketamine provider. Coordinating between these providers ensures that everyone is aware of your full medication list and can make informed decisions.

Give each provider permission to communicate with the others about your care. Review our guide on choosing a ketamine clinic for tips on finding providers who coordinate well. This simple step can prevent medication conflicts and ensure the best possible outcomes. Your ketamine provider and your other prescribers should be working as a team, not in isolation.

References

• MedlinePlus: Ketamine Injection — National Library of Medicine drug information on ketamine, including drug interaction warnings
• Mayo Clinic: Ketamine (Injection Route) — Mayo Clinic guide to ketamine interactions with other medications
• SAMHSA — Substance Abuse and Mental Health Services Administration resources on safe medication practices