Independent reference · Updated September 2026
Plain facts about phenibut
What it is, where it stands legally, what can go wrong, and where to get help. We don’t sell phenibut or link to anyone who does.
Phenibut is a sedating drug developed in the Soviet Union in the 1960s. It is a prescription medicine in Russia and a few neighboring countries. In the United States it isn’t approved for any medical use, and since 2019 the FDA has said it can’t be sold as a dietary supplement. Several states have now made it a controlled substance.
Quick facts
- FDA status: Not approved as a drug. Not allowed as an ingredient in dietary supplements since April 2019.
- Federal controlled substance: No, as of September 2026.
- States where it’s a controlled substance: Alabama, Utah, Connecticut and South Dakota. Maryland limits sales to people 21 and older.
- Biggest risks: Tolerance builds fast, withdrawal can be severe enough to need hospital care, and it can cause dangerous sedation, especially with alcohol or opioids.
- Poison Help line (U.S.): 1-800-222-1222, free and open 24/7.
If someone is very hard to wake, confused, breathing slowly or having a seizure after taking phenibut, call 911.
Start here
What is phenibut?
Where it came from and how it acts on the brain.
Is it legal?
Federal law, state laws and other countries, updated September 2026.
Is it safe?
Dependence, overdoses, drug combinations and product quality.
Side effects
What poison centers see and when to call 911.
Withdrawal
Symptoms, why stopping suddenly is risky, and how doctors treat it.
Phenibut and anxiety
What the evidence actually shows.
Getting help
Helplines, treatment finders and what to tell a doctor.
About this site
Who writes Phenibut.org and what changed in 2026.