Medication use often comes up in preparation for psilocybin therapy. A frequently asked question is what happens if you use mirtazapine (Remeron) and also take lorazepam (Ativan). Can these drugs “dampen” the psilocybin experience, and if so, in what way?
This article provides general, informative explanations regarding potential interactions, why dosage and usage patterns matter, and why “stopping for a stronger session” is not automatically a good idea. It is not individual medical advice. Always discuss changes in medication with your prescribing physician.
It is important to note that psilocybin sessions, as discussed in a therapeutic context, are typically offered in the Netherlands within legal frameworks, such as with truffles, or within research. MDMA sessions can currently only be discussed within scientific research or in practice via harm reduction. This distinction is relevant because it determines which guidance, screening, and safety agreements are appropriate.
Why medication matters in psilocybin therapy
Psilocybin (converted to psilocin in the body) acts primarily via serotonin receptors, particularly the 5-HT2A receptor. This is an important target for changes in perception, emotional processing, and the “depth” of a psychedelic experience. Medication that affects the serotonin system, or that depresses the nervous system, can therefore have a noticeable effect on:
The intensity of the experience (how strong it feels).
Emotional accessibility (how easily feelings arise and can be felt).
Anxiety and tension during the session.
The extent to which someone can reflect clearly or, conversely, becomes emotionally numb.
In therapy, “stronger” is not always “better.” Sometimes, a milder experience is actually workable and safer. The central question is usually: in your situation, what is a responsible balance between effectiveness, stability, and safety?
Mirtazapine (Remeron) and psilocybin: how can it dampen?
Mirtazapine is an antidepressant with effects on various receptors, including serotonin-related receptors. In harm reduction and experiential contexts, it is often mentioned that mirtazapine can reduce the psychedelic effects of classic psychedelics because, among other things, it affects the 5-HT2A receptor. It is precisely this receptor that plays a major role in the typical psychedelic effects of psilocybin.
What people sometimes report in practice is, for example:
A less intense “trip”.
Fewer visual changes.
Less emotional depth or less pronounced meaningful moments.
Sometimes there is a subtle effect, but it is less pronounced than without mirtazapine.
It is important to emphasize that individual responses can vary. Factors such as dosage, duration of use, sensitivity, sleep, set and setting, and therapeutic preparation can all play a role. What does “almost nothing” for one person can still provide a noticeable experience for another.
Half-life and timing: why “taking a break” can be complex
With medications, the half-life is often considered: the time in which the amount of active substance in the body approximately halves. For mirtazapine, a half-life of roughly 20 to 40 hours is often cited (on average around 30 hours). As a rule of thumb, the majority is out of the body after about five half-lives.
Theoretically, this works out to about 6 to 8 days before the majority is eliminated. In practice, however, it can be more complicated, as long-term use can also be associated with changes in receptor sensitivity and sleep patterns. Such effects do not always “disappear” once the substance has largely left the blood.
An important safety and therapeutic point is that abruptly stopping mirtazapine is not without risks. Worse sleep, restlessness, or a return of symptoms can actually make a person more vulnerable to a difficult session. Striving for a “stronger” psilocybin experience can then backfire. Tapering off or changing antidepressants therefore belongs in a medically supervised plan with sufficient time.
Lorazepam (Ativan) and psilocybin: calming, but also blunting
Lorazepam is a benzodiazepine. It enhances the action of GABA, the main inhibitory system in the brain. This typically has anxiolytic, muscle-relaxing, and sedating effects. In the context of psychedelics, lorazepam can therefore soften the sharp edges, but also influence aspects of therapeutic depth.
Possible effects that are mentioned:
Less anxiety and less tension during the session.
More physical relaxation.
Less emotional intensity or less “openness”.
A more flattened experience, sometimes with less deeply felt processing.
In harm reduction, a benzodiazepine is sometimes seen as a means to help reduce the escalation of panic. At the same time, it is not a guaranteed “trip stopper.” Depending on the dose and timing, the psychedelic experience may still remain present, but with a different color.
Lorazepam half-life: how long can it still play a role?
For lorazepam, a half-life of approximately 10 to 20 hours is often cited. If you apply the same rule of thumb of about five half-lives, you arrive at roughly 2 to 4 days for largely eliminated use. With regular or daily use, accumulation can occur and the sedative effect may be noticeable for longer, partly due to habituation and changes in stress response.
In practice, this means that the timing of intake relative to a psilocybin session can be relevant. But here too, the rule applies: it is not just a matter of calculation. The reason why someone uses lorazepam (for example, panic, insomnia, or acute stress) is at least as important for the preparation as the pharmacology itself.
The combination of mirtazapine plus lorazepam: what dulls what?
If you use both agents, they can “dampen” at different levels:
Mirtazapine can primarily reduce typical psychedelic intensity through effects on serotonin receptors, including the 5-HT2A pathway relevant to psilocybin.
Lorazepam can primarily dampen arousal and emotional intensity via the GABA system, which can make the experience feel calmer, but also less deep or less deeply felt.
This does not automatically mean that psilocybin therapy “cannot be done,” but rather that the effect may turn out differently than expected. For example, someone might experience less visually and be less emotionally affected, whereas emotional access is particularly important for some therapy goals. On the other hand, an overly intense experience without stability or sleep might also be undesirable.
Therefore, “as little interaction as possible” is not always the best choice. Sometimes it is wiser to accept that the experience may be milder, if that supports psychological and physical stability.
What is more important in therapy than “maximum effect”?
In a therapeutic approach, the focus is usually not on maximizing intensity, but on creating conditions in which someone can safely explore and integrate. A few points that carry significant weight in this regard:
Stability beforehand: sleep, stress level, resilience, and any anxiety symptoms.
Good preparation: intention, expectations, dealing with tension, and discussing difficult scenarios.
Safe setting and guidance: clear agreements, down-to-earth support, and aftercare.
Integration: translating insights into daily life, and placing the experience in context.
Medication use belongs in that preparation, not as an afterthought. It is not just about “whether it works,” but also about what changes in the emotional process, the safety, and the predictability of the session.
Practical harm reduction considerations regarding medication
Without providing individual advice, these are general points to consider that often help to make the conversation with a counselor or prescriber concrete:
Usage pattern: do you take mirtazapine daily and lorazepam occasionally, or both regularly?
Dosages: low and high doses can produce very different effects on perception and alertness.
Reason for prescription: is it for sleep, anxiety, depression, panic, or something else?
Timeline: how long have you been using it, and has anything changed recently?
Risk of quitting: withdrawal, rebound anxiety, or insomnia can strongly affect your set and resilience.
Anyone wishing to delve deeper into the specific question regarding Remeron, Ativan, and a psilocybin session can read the original discussion via this source: Remeron (mirtazapine) + Ativan (lorazepam) and a psilocybin session. Please note that this is an informative harm-reduction context and not a substitute for medical advice.
Registration and intake: why screening is essential in therapy
Because medication can alter both intensity and emotional accessibility, an intake within therapy is especially important. Not to force a “perfect” combination, but to create realistic expectations and make safe choices. This also includes: not adjusting medication on your own initiative, but discussing any plans with the prescribing physician.
If you would like to explore whether a program might be suitable, you can sign up for an intake via to register. During the intake, your goals are typically discussed, as well as the guidance you expect, the resources and medication that play a role, and which preparatory steps are advisable.
Conclusion
Mirtazapine and lorazepam can both dampen a psilocybin experience, but through different mechanisms. Mirtazapine can reduce the typical psychedelic intensity, while lorazepam primarily has a sedative effect and can flatten emotional depth. The magnitude of this effect depends heavily on dosage, duration and frequency of use, as well as your psychological stability and sleep.
The most important principle within therapy is not “maximum intensity,” but a safe, well-prepared, and integrable experience. Do not change medication on your own initiative before a session, but discuss this with your doctor and include it in the intake and preparation.
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