Psilocybin and Gabapentin together

Psilocybin + Gabapentin can cause:

1. Neurochemical interactions: Psilocybin primarily activates 5-HT₂A receptors. Gabapentin increases GABAergic inhibition through Ca²⁺ channel subunit modulation. As with LSD, gabapentin can counteract some of the excitatory effects of psilocybin. This is because increased GABA inhibition lowers neurotransmitters such as glutamate. The combination does not act on the same receptor; no direct pharmacological interaction is known on 5-HT systems.

2. Therapeutic effect: Gabapentin can dampen the intense psychedelic experience of psilocybin due to its relaxing effect. This can be desirable in some cases (less anxiety, easier surrender to the experience), but it can also reduce the desired depth of the trip. The therapeutic insights that are supposed to come with psilocybin may be weakened. There are indications that GABAergic modulation can reduce rewarding effects, suggesting that gabapentin may diminish the emotional openness and malleability that psilocybin provides. On the other hand, gabapentin can help temper any tension or panic during the trip through additional inhibition.

3. Danger or risks: Psilocybin and gabapentin potentiate each other's risk of sedation: gabapentin itself can cause drowsiness, dizziness, and impaired concentration, and these have a disruptive effect when combined with a psychedelic state. There is no noticeable increased risk of serotonin syndrome or life-threatening toxicity. However, neurological problems (such as ataxia or respiratory depression) may arise from an overdose or abuse of gabapentin. The combined addiction potential is limited. In general, it is advised not to take gabapentin before a psilocybin session due to its sedative effect.