If you’re receiving ketamine therapy for depression or another mental health condition, several evidence-based strategies can meaningfully improve how well it works. These range from what you avoid taking beforehand to how you spend the 24 hours after treatment. Some factors amplify ketamine’s effects at the biological level, while others shape whether the benefits last days or weeks.
Reduce or Stop Benzodiazepines Before Treatment
The single most well-documented way to blunt ketamine’s antidepressant effect is to take benzodiazepines alongside it. Multiple studies have found that benzodiazepines shorten the duration of ketamine’s benefits, delay the time to both initial response and full remission, and speed up relapse. In one analysis of 47 patients with major depression, those taking the equivalent of 10 mg or more of diazepam daily were significantly more likely to be non-responders at any point during the week following treatment.
One striking case study illustrates the magnitude: a patient with bipolar depression saw their antidepressant response to ketamine jump from lasting 2 to 3 days to lasting 10 to 14 days simply after withdrawing from lorazepam. The clinical consensus from a systematic review in the International Journal of Neuropsychopharmacology is straightforward: minimize benzodiazepine and sleep medication use when receiving ketamine for depression. If you’re currently taking a benzodiazepine, talk to your prescriber about a tapering plan before starting ketamine. Do not stop abruptly, as benzodiazepine withdrawal carries its own serious risks.
Magnesium May Amplify the Core Mechanism
Ketamine works primarily by blocking NMDA receptors in the brain, which triggers a cascade of changes that promote new neural connections. Magnesium blocks the same receptors through a different mechanism. When researchers applied both magnesium and ketamine to NMDA receptors in a lab setting, the concentration needed to achieve the same level of receptor blockade dropped by over 90%. The interaction was “super-additive,” meaning the combined effect was greater than simply stacking the two together.
This doesn’t automatically mean taking a magnesium supplement will double your ketamine response, since lab conditions differ from what happens inside a living brain. But magnesium deficiency is common (roughly half of Americans don’t get enough from their diet), and low magnesium levels are independently linked to treatment-resistant depression. Ensuring your magnesium levels are adequate before treatment is a low-risk step worth discussing with your provider. Forms like magnesium glycinate tend to be better absorbed and gentler on the stomach than cheaper options like magnesium oxide.
What You Do in the First 24 Hours Matters
Ketamine triggers measurable changes in brain structure remarkably quickly. A randomized controlled trial using brain imaging found that gray matter microstructural changes, markers of new neural connections forming, were detectable within 24 hours of a single infusion. This window of heightened neuroplasticity is when your brain is most receptive to forming new patterns of thought and behavior.
This is why integration work after treatment can be so valuable. Clinics with the strongest outcomes typically pair ketamine sessions with structured therapy that draws on techniques like motivational interviewing, behavioral activation, and trauma-informed approaches. Therapists may also incorporate cognitive behavioral techniques depending on the patient’s needs. The goal during integration is to take the emotional openness and cognitive flexibility ketamine creates and channel it toward lasting changes, whether that means processing a traumatic memory, breaking a thought pattern, or building motivation for behavioral changes you’ve been stuck on.
Even without formal therapy, you can use this window intentionally. Journaling about insights from the experience, spending time in nature, engaging in meaningful conversations, or practicing mindfulness can all help reinforce new mental patterns while your brain is most receptive. Conversely, scrolling your phone, watching stressful news, or returning immediately to a high-conflict environment may waste the opportunity.
Optimize the Treatment Environment
The setting during your ketamine session shapes the experience significantly. Music is one of the most controllable variables, and certain characteristics consistently produce better outcomes. Instrumental, ambient, or meditative music works best. Lyrics can pull attention outward and interfere with introspection. A tempo between 60 and 80 beats per minute matches the relaxed state ketamine produces, and smooth transitions between tracks prevent jarring interruptions. Many clinics curate playlists specifically for this purpose, but if you’re doing at-home sublingual treatment, building your own playlist with these characteristics is worthwhile.
Beyond music, a comfortable eye mask, a warm blanket, and a quiet room without interruptions create the conditions for deeper therapeutic experiences. Think of the environment as either supporting or competing with the internal process ketamine facilitates.
Follow Fasting Guidelines to Reduce Nausea
Nausea is one of the most common side effects of ketamine, and it can turn a potentially productive session into a miserable one. Cleveland Clinic recommends avoiding food for at least two hours before treatment and not drinking anything for 30 minutes before. Exact timing varies by clinic, but arriving with a mostly empty stomach consistently reduces the likelihood of nausea. A light meal several hours beforehand is fine. A heavy meal right before is not.
Medications That May Interfere
Beyond benzodiazepines, other medications interact with ketamine in ways worth knowing about. Lamotrigine, a mood stabilizer commonly prescribed for bipolar disorder, was initially suspected of blocking ketamine’s effects. However, a study that directly tested this found no significant difference in response or remission rates between patients on lamotrigine and those not taking it. There was a trend toward reduced dissociation (the “floaty” feeling) in lamotrigine users, which could matter if dissociation is part of the therapeutic mechanism for you, but the antidepressant effect itself appeared intact.
Ketamine is processed in the liver primarily through two enzyme pathways. Drugs that strongly inhibit these pathways can dramatically increase ketamine blood levels. The antibiotic clarithromycin, for example, increased blood concentrations of ketamine by 263% in one study. On the other side, the antibiotic rifampicin, which speeds up liver metabolism, significantly reduced ketamine levels after oral dosing. If you’re taking any prescription medication, your ketamine provider needs a complete medication list to account for these interactions.
Grapefruit Juice and Liver Metabolism
Grapefruit juice is a well-known inhibitor of the same liver enzyme (CYP3A4) that breaks down ketamine. In theory, drinking grapefruit juice before oral or sublingual ketamine could slow its metabolism, increasing blood levels and extending its duration. This is the same mechanism by which grapefruit interacts with dozens of other medications.
However, the picture is more complicated than it first appears. Research has shown that blocking CYP3A4 alone didn’t always change ketamine levels, because a second enzyme pathway (CYP2B6) can compensate. When that second pathway was specifically blocked in studies, ketamine levels rose significantly. This means grapefruit juice might have a modest effect, a dramatic one, or none at all depending on your individual enzyme activity. This is not something to experiment with on your own, as unpredictably higher ketamine levels carry real risks including prolonged sedation and cardiovascular effects.
Building a Protocol That Lasts
The patients who get the most from ketamine therapy tend to treat each session as part of a larger process rather than a standalone event. That means preparing in the days before (reducing substances that interfere, ensuring adequate nutrition and sleep), optimizing the session itself (environment, music, mindset), and using the 24-plus-hour neuroplasticity window afterward for intentional integration work. A large retrospective study found that ketamine-assisted psychotherapy using structured integration produced lasting improvements in depression, anxiety, and PTSD symptoms at both 3 and 6 months.
The difference between ketamine as a temporary mood boost and ketamine as a catalyst for sustained change often comes down to what surrounds the treatment itself.