Should I stop taking my benzodiazepine before ketamine therapy?

No, and please do not make that change on your own. Stopping a benzodiazepine abruptly can cause serious withdrawal, including seizures. Any change to a benzodiazepine belongs to the prescriber who manages it, tapered on a schedule they set. If the research raises a question worth asking, bring it to them, and we are glad to be part of that conversation.

How is this different from the way benzodiazepines affect other antidepressants?

SSRIs and SNRIs work gradually through serotonin and norepinephrine systems, and benzodiazepines are frequently prescribed alongside them without any expectation of interference. Ketamine is different because its proposed mechanism depends on a brief surge of glutamate activity. Benzodiazepines reinforce the inhibitory system that surge has to overcome, which is why an interaction is plausible here but not with most conventional antidepressants.

Does taking a benzodiazepine occasionally ruin an infusion?

The evidence does not support that. In the studies, occasional or low-dose use was not associated with worse outcomes; when benzodiazepine use was measured as a simple yes-or-no variable it predicted nothing at all. The signal appears at higher sustained daily doses. Tell us what you took and when, and we will factor it in.

If benzodiazepines shorten the effect, how long should I expect relief to last?

Duration varies substantially between individuals regardless of benzodiazepine use. What the research suggests is a relative shift rather than a fixed number: higher doses were associated with slower onset and earlier return of symptoms. We track your actual response over your first series and set your maintenance interval from what we observe, not from an average.

Does lamotrigine block ketamine the way people claim online?

Current clinical evidence does not support that claim. The widely cited study was done in healthy volunteers and measured ketamine's acute subjective effects, not its antidepressant benefit. When researchers examined patients with depression, real-world cohorts in 2023 and 2024 found no significant difference in response or remission between lamotrigine users and non-users, with some signal that it reduces dissociation.

Ketamine and Benzodiazepines: Does Xanax or Klonopin Blunt Your Response?

Why this question comes up so often

A large share of the people who come to us for ketamine are already taking a benzodiazepine. Clonazepam for panic. Lorazepam for sleep. Alprazolam kept in a drawer for the days that get away from them. So the question arrives early and it is a fair one: if one medication quiets the brain down, and the other is supposed to wake something up, are they working against each other?

The honest answer is that they might be, somewhat, at higher doses. That is a reason to plan carefully. It is not a reason to change anything on your own, and as you will see below, the size of the effect is smaller and more nuanced than the internet tends to suggest.

The two drugs work on opposite sides of the same circuit

Think of the brain's two main chemical signals as a brake and an accelerator. GABA is the brake, the inhibitory signal that slows neural firing. Glutamate is the accelerator, the excitatory signal that drives it. Benzodiazepines work by amplifying GABA at the GABA-A receptor, which is exactly why they calm acute anxiety so effectively and so quickly.

Ketamine goes the other direction. By blocking NMDA receptors that sit on inhibitory interneurons, it briefly takes the brake off, producing a surge of glutamate. That surge activates AMPA receptors and triggers the downstream cascade — BDNF release, mTOR signaling, new synaptic connections — that most researchers believe underlies the antidepressant effect. We walk through that in more detail in how ketamine works and glutamate versus GABA.

So the theoretical concern is straightforward. If ketamine's benefit depends on an excitatory burst, a medication that reinforces the brake might blunt it. That is the hypothesis. What follows is what happened when people tested it.

What the clinical studies actually found

A 2020 study published in Frontiers in Psychiatry followed 99 adults with major depressive disorder receiving a single 0.5 mg/kg IV ketamine infusion. Patients taking more than 8 mg of diazepam equivalents per day were significantly less likely to respond. Two details make this finding stronger than a simple correlation: the effect held after adjusting for baseline anxiety and depression severity, and it was not explained by blood levels of ketamine or norketamine. In other words, it appears to be a genuine interaction at the receptor level rather than benzodiazepine users simply being sicker or metabolizing the drug differently.

A post-hoc analysis published in the Journal of Clinical Psychiatry in 2015 looked at 13 patients with treatment-resistant depression receiving six infusions over two weeks. Here the headline numbers did not move: response and remission rates were no different between benzodiazepine users and non-users. What changed was the timing. Users took significantly longer to respond, longer to reach remission, and relapsed sooner afterward.

The largest look came from the RAPID intravenous ketamine study, reported in the Journal of Clinical Psychiatry in 2022. When benzodiazepine use was treated as a simple yes-or-no variable, it had no significant impact at all. Only when researchers accounted for dose did a signal appear: above roughly 8 mg diazepam equivalents, patients showed a smaller improvement at the 24-hour mark. By day three, that difference was no longer statistically significant.

A 2021 review in the International Journal of Neuropsychopharmacology pulled these threads together and concluded that benzodiazepines most likely shorten the duration of ketamine's antidepressant effect, with higher doses predicting poorer response.

Dose matters far more than whether you take one at all

The consistent thread across every one of those studies is that the binary question — do you take a benzodiazepine, yes or no — is the wrong question. It repeatedly fails to predict anything. Cumulative daily dose does, and the same rough threshold of 8 mg diazepam equivalents shows up independently in more than one dataset.

We would gently discourage you from doing that conversion yourself. Published equivalency tables disagree with each other, they were mostly derived for sedation rather than for anxiety, and the arithmetic tends to produce more alarm than insight. Your prescriber can tell you where your regimen actually sits.

Esketamine appears less affected

If you are weighing IV ketamine against Spravato, this is a real point of difference. An analysis published in Neuropsychiatric Disease and Treatment in 2020, drawn from trials of intranasal esketamine in patients with depression and acute suicidal ideation, found that the change in depression scores 24 hours after the first dose was essentially the same in benzodiazepine users and non-users. Benzodiazepines did increase sedation. They did not measurably reduce the antidepressant effect in that window. We compare the two routes in ketamine versus Spravato.

The lamotrigine question turns out differently than people expect

Lamotrigine gets swept into this conversation constantly, usually with the claim that it blocks ketamine outright. That claim traces back to a real study — Anand and colleagues, published in Archives of General Psychiatry in 2000 — in which 300 mg of lamotrigine reduced ketamine's perceptual and psychotomimetic effects in 19 healthy volunteers.

But that study measured how ketamine felt in people who were not depressed. It did not measure whether ketamine worked in people who were. When researchers looked at that question directly, the picture changed. A 2023 real-world cohort of patients with treatment-resistant depression found no significant difference in response or remission between those continuing lamotrigine and those not, alongside a trend toward less dissociation. A 2024 analysis of a real-world unipolar depression sample likewise found no evidence of a meaningful interaction.

So the current clinical evidence does not support treating lamotrigine as an obstacle. For some patients it may make the experience more comfortable without costing them the benefit.

What we do at Music City Ketamine

At consultation we ask for a complete medication list, and specifically for what you actually take rather than only what is prescribed. As-needed medications are the ones most often left off, and for this particular question they are the ones that matter most.

We do not ask you to alter a prescription. Adjusting or discontinuing a benzodiazepine belongs to the clinician who manages it, and doing it abruptly carries genuine risk, including seizures. What we will sometimes discuss with your prescriber, with your permission, is timing — whether an as-needed dose can reasonably be taken on a different day than an infusion. Our guide to talking to your PCP covers how to open that conversation.

There is also a straightforward safety dimension. Benzodiazepines and ketamine are both sedating, and together they are more so. Marla Peterson, CRNA, reviews your medication list before each infusion and factors it into monitoring and titration. Broader interactions are covered in ketamine medication interactions.

Honest expectations

Ketamine is FDA-approved as an anesthetic; its use for depression and anxiety is off-label. Esketamine is FDA-approved for treatment-resistant depression and for depression with acute suicidal ideation.

Taking a benzodiazepine does not disqualify you from ketamine therapy and does not mean it will fail. Most patients across these studies still responded. What the evidence suggests is narrower and more useful than a yes-or-no verdict: at higher daily doses, the benefit may take longer to arrive and may not hold as long. That is worth knowing in advance, because it is exactly the kind of thing we plan around when we set the interval between maintenance infusions.

If your response is fading faster than expected, benzodiazepine dose is one of several things worth revisiting with both of us, not a verdict on whether ketamine is right for you. You can find our pricing in what ketamine therapy costs, and more on the conditions we treat under depression and anxiety.