Substance guides
Phenibut withdrawal: The supplement nobody warns you about
Published December 1, 2024 · 7 min read · Updated April 2026
Reviewed for accuracy by licensed clinical professionals.
Phenibut is sold as a supplement but acts on GABA-B receptors similarly to baclofen. Withdrawal can be severe and dangerous.
How dependence develops
Marketed for anxiety and sleep. Tolerance develops rapidly (within days). Users escalate doses dramatically. Physical dependence occurs within weeks of daily use.
Withdrawal symptoms
Severe anxiety and panic. Insomnia (complete inability to sleep). Psychosis and hallucinations. Rapid heartbeat and tremors. Seizure risk (though less documented than benzo withdrawal).
Treatment
No established protocol. Baclofen taper is the most common approach (similar mechanism). Gabapentin may help. Benzodiazepines for severe symptoms. Medical supervision recommended.
Frequently asked questions
Is phenibut withdrawal dangerous?
Potentially. Severe anxiety, insomnia, psychosis, and possible seizures can occur. Medical supervision recommended.
How do you detox from phenibut?
Baclofen taper is the most common approach. Medical supervision recommended due to severity.
Is phenibut addictive?
Yes. Despite being sold as a supplement, phenibut produces rapid tolerance and severe physical dependence.
Disclaimer: Informational only. Not medical advice. SAMHSA: 1-800-662-4357.