[Solved] Can Buspirone be taken with psilocybin truffles?

Buspirone acts primarily on the 5-HT1A serotonin receptors (as a partial agonist) and is often prescribed for anxiety disorders. Psilocybin (after conversion to psilocin) acts primarily on the 5-HT2A receptors. Because both substances affect the serotonin system, it is good to check whether they can be safely combined.

Safety

There are no indications of a dangerous interaction such as serotonin syndrome, which can be a risk with combinations including, for example, MAO inhibitors or high doses of SSRIs. The combination of Buspirone and psilocybin is therefore not considered medically high-risk.

Effect on the experience

Buspirone has a anxiety-reducing and mildly calming effect on the psyche. This can mean that a psilocybin session or a truffle session less intense or becomes flattened. For some people, this feels like protection against a trip that is too intense, while for others it feels like a missed depth.

Half-life and effect

The The half-life of Buspirone is 2–3 hours.. A medicine has only truly worn off after approximately 5 × the half-life. For Buspirone, this means 10–15 hours after ingestion.

• Are you using Buspirone? occasionally, then there is a good chance that psilocybin will work virtually undisturbed if you wait longer than 10–15 hours after the last dose.
• Are you using Buspirone? daily or several times a day, then you build up a constant level and receptor downregulation can occur. This can then result in a dampened experience, even if you skip a day.

Practical considerations

• The combination is most likely safe, but probably less powerful.
• If you the full depth of a truffle ceremony if you wish to experience this, discuss with your own doctor whether (temporarily) pausing Buspirone is an option.
• If you use Buspirone primarily for anxiety, it can actually help you feel safer during a session.

DisclaimerThis is not medical advice, but you can present this message to the doctor who prescribes your medication. This way, you can discuss what is possible in your specific situation.

Buspirone (brand Buspar) is an anxiolytic that acts primarily as a partial agonist of the serotonin 5-HT₁A receptor. Psilocybin truffles contain psilocybin, which is converted in the body into psilocin – an agonist of 5-HT₂A receptors.. Both substances therefore influence the serotonin system, but via (partially) different receptor mechanisms. Buspirone does not inhibit serotonin reuptake (no SSRI effect) and acts primarily on 5-HT₂A, while psilocin primarily activates the hallucinogenic 5-HT₂A receptors.

Possible pharmacodynamic interactions

Because buspirone binds to 5-HT₁A receptors (and weakly to 5-HT₂ receptors)), it can weaken the effects of psilocybin by competing for serotonin receptors. In an RCT with healthy volunteers, pre-administered buspirone (20 mg) strongly reduced the characteristic visual hallucinations of psilocybin. A tendency toward reduced “Oceanic Boundlessness” (experiences of connectedness and happiness, including derealization/depersonalization) was also observed (p≈0.06). This was confirmed in animal studies: in mice, buspirone blocked the typical psilocybin-induced head-twitch response, a measure of psychedelic stimulation.

According to a recent systematic review, “buspirone exerts inhibitory effects on psilocybin-induced effects, presumably via 5-HT₁A activation”. An advisory document from the Oregon Psilocybin Taskforce therefore recommends tapering off buspirone at least 5 days before a trip to “loss of psychedelic effect” to prevent. The same source reports that buspirone, as a “non-psychedelic partial agonist,” can the trip dampen through competitive inhibition.

Effect on mood and cognition

Scientific research shows that buspirone dampens the subjective intensity of the psychedelic experience. Buspirone significantly reduced the intensity of visual illusions (“Visionary Restructuring”) and also showed a reduced tendency towards mystical experiences (Oceanic Boundlessness). In the RCT, participants generally ended up with milder experiences when they had used buspirone. This suggests that continuous use of buspirone reduces the trip less euphoric and less introspective can produce. The exact effect on cognitive functions has not been studied in detail, but it is expected that reduced psychedelic stimulation also leads to less distortion of thinking and perception. In short: users often report less visual and emotional depth with an unchanged buspirone dose. The Cambridge review summarizes this: buspirone has a high affinity for 5-HT₁A/₂A receptors and “attenuates psilocybin-induced visual perceptual changes”. Such findings correspond with reports on experience forums, where it is said that the trip ‘'weak'’ was when Buspar was used simultaneously.

Physical reactions and side effects

Psilocybin naturally causes increased heart rate and blood pressure. Buspirone can also cause tachycardia and palpitations as a side effect. Combined use can lead to an exacerbation of these cardiovascular reactions, especially at higher doses. Furthermore, buspirone can cause dizziness, drowsiness, and dry mouth, effects that are not typical of psilocybin itself. Therefore, although the two substances do not directly have the same physical side effects, it should be noted that an increased heart rate and sensation of warmth/movement during the trip may be somewhat more pronounced due to buspirone. In general, no serious toxic interactions have been reported: preclinically, very high doses of psilocybin can be tolerated without fatal effects., and buspirone has – apart from psychedelics – a favorable safety profile.

Serotonin syndrome and other risks

The combined risk of serotonin syndrome appears to be very small. Buspirone does not inhibit serotonin reuptake and does not directly increase serotonin levels., so it works differently than SSRIs or MAO inhibitors. Official interaction lists do point out a theoretical risk when buspirone is used together with other highly serotonergic agents (SSRIs, MAO inhibitors, triptans, lithium, tramadol, etc.). Psilocybin does not fall into that category, but it is serotonergic. However, in the available clinical studies of psilocybin with antidepressants (such as escitalopram), serotonin syndromes were rarely observed. An RCT with psilocybin during escitalopram treatment found no increase in serotonin toxicity.. In summary, the literature states that serotonin syndrome is merely a theoretical concern with this combination, and no cases have been reported. However, it is advisable to remain alert for symptoms (convulsions, unstable vital signs, high fever, decreased consciousness).

Other safety aspects: both buspirone and psilocybin can cause anxiety and nausea (albeit in different ways). Buspirone rarely causes psychological side effects such as nervousness or confusion. Psilocybin can (in high doses or adverse conditions) trigger acute anxiety or panic; benzodiazepines are used as an antidote in such emergency situations. There are no reports of serious cardiac arrhythmias or liver problems due to the combination. Cardiac monitoring may be considered at high doses due to possible increases in blood pressure and heart rate.

User experiences

On experience forums and in experience reports, it is generally suggested that Buspar dampens the trip. For instance, users reported that a trip with an unchanged Buspirone dose felt much milder or almost absent – visual effects were described as noticeably weaker. Although this anecdotal information has not been formally investigated, it aligns with the aforementioned findings from scientific literature. The Oregon Guide to Psilocybin therefore recommends tapering off Buspirone 5 days prior to use. In online discussions, it is also suggested that stopping or reducing Buspirone before using magic mushrooms/truffles enhances the experience.

Conclusion

There appear to be no direct safety reasons (such as life-threatening side effects) that speak against the concomitant use of buspirone and psilocybin. The combination results in no known acutely dangerous interactions. However, buspirone likely leads to a severely weakened psychedelic experience. Scientific studies show that buspirone significantly reduces visual hallucinations, feelings of unity/detachment, and other psychedelic components. Practically, this means that users will notice few of the usual effects when taking buspirone simultaneously. Side effects such as palpitations or headaches are not significantly different than when the substances are used separately. The risk of serotonin syndrome is very small, but an attentive psychonaut should be familiar with its symptoms.

In summary: the combination is in itself not deadly unsafe, but is generally advised against if one wishes to retain the psychedelic effects. Buspirone can largely “moderate” the trip (reduce potency). Precautions include tapering of buspirone, monitoring blood pressure/heart rate, and awareness of symptoms of serotonin toxicity. Scientific sources (RCTs, reviews) and anecdotal reports agree that buspirone dampens the intended trip effects.