Can You Take Fasoracetam and Phenibut Together?

Use extra care with this pair

The short answer

Fasoracetam upregulates GABA-B receptors, while Phenibut is a GABA-B agonist. Fasoracetam may increase sensitivity to Phenibut by increasing receptor density, potentially amplifying Phenibut's sedative and anxiolytic effects unpredictably.

How to arrange timing

Use extreme caution with this combination. Fasoracetam's GABA-B upregulation may make Phenibut effects unpredictable. Never exceed normal doses of either.

Reference

Reference noted for this combination: Ogasawara T, et al. Involvement of GABA(B) receptors in the cognitive-enhancing effect of NS-105, a novel nootropic agent. Eur J Pharmacol. 1999;367(2-3):151-158.

Important context

Whether supplements suit you together also depends on dose, product formulation, health conditions, and medication use. Ask a doctor or pharmacist first if you take medication, are pregnant or breastfeeding, or have a chronic condition.