Phenibut vs GHB
C₁₀H₁₃NO₂
Phenibut
Depressants
VS
C₄H₈O₃
GHB (gamma-hydroxybutyrate)
Depressants
Phenibut and GHB are the internet's two favorite 'legal-ish' downers. Phenibut is a Russian anti-anxiety drug sold as a supplement in the US; GHB is a prescription narcolepsy medicine and club drug. Both act on GABA systems, both produce euphoric calm, and both form brutally fast dependencies.
Phenibut vs GHB — side by side
| Phenibut | GHB | |
|---|---|---|
| What it is | β-phenyl-GABA — Russian anxiolytic (Noofen), sold online as a nootropic supplement | GHB — endogenous neurotransmitter; Xyrem for narcolepsy; club scene staple |
| Legal status | Uncontrolled in the US (not a supplement by FDA rules, but sold as one); prescription in Russia | Schedule I (US), Schedule III for Xyrem |
| Onset & duration | 2–4 h onset; 10–16 h duration — very long | 15–30 min onset; 1–3 h — very short |
| The 'feel' | Social lubrication, calm, music appreciation — the 'happy pill' reports | Heavier euphoria, more physical intoxication, stronger disinhibition |
| Dosing rhythm | Once daily or less (tolerance builds within days) | Redosed hourly through the night |
| Withdrawal | Days-to-weeks of severe anxiety, insomnia, and in heavy users seizures/psychosis — benzo-class | Potentially lethal withdrawal — ICU-class, like alcohol |
| Community warning | r/phenibut is full of 'I took it daily for a month and it destroyed me' posts | Same warnings in GHB communities, plus overdose deaths |
The verdict
Phenibut is GHB's slow cousin: less intense, much longer, and with a withdrawal that's slower to arrive but similarly vicious. Its uncontrolled US status is a regulatory accident that has produced thousands of dependence cases — people assume 'supplement' means 'safe to take daily,' and phenibut punishes that assumption within weeks. Neither drug forgives daily use; both reward rare, measured use or none at all.
?Frequently asked questions
Is phenibut legal?
In the US it occupies a gray zone — sold as a supplement despite FDA objections; it's a prescription drug in Russia and controlled in several other countries. 'Sold online' is not the same as 'approved.'
Which is more addictive, phenibut or GHB?
Both form dependence within weeks of daily use. GHB's is faster and its withdrawal more acutely dangerous; phenibut's is sneakier because the long duration masks how often you're actually under the influence.