Phenibut Withdrawal Timeline
Compiled from cited sources · not yet medically reviewedUpdated 2 sources
Need help now? SAMHSA’s National Helpline is free, confidential and open 24/7 in English and Spanish: 1-800-662-4357. In a mental health crisis, call or text 988. In an emergency, call 911.
For information only, not medical advice. Talk to a doctor before stopping or changing any medication. Medical disclaimer
⚠ Medical warning
Withdrawal from this drug hasn’t been studied well, so it’s hard to predict. Don’t go through it alone if you’ve been using heavily or every day. Call 911 for seizures, chest pain, trouble breathing, or severe confusion, and call or text 988 for thoughts of suicide.
Quick answer
Phenibut is an unregulated drug developed in Russia and sold online for anxiety and sleep. A CDC report says it can cause sedation and breathing problems, and withdrawal symptoms including anxiety, agitation and acute psychosis. U.S. poison centers logged 1,320 phenibut exposures from 2009 to 2019, with three deaths. There’s no well-studied withdrawal timeline, so get medical help if you’ve used it daily.
Phenibut withdrawal timeline at a glance
| Phase | When | What you may feel | Severity | Red flags |
|---|---|---|---|---|
| Early withdrawal | Within a day or so of the last dose in daily users (not well studied) | Rebound anxiety; Insomnia; Restlessness, irritability | Moderate | — |
| Peak withdrawal | The following days (not well studied) | Agitation; Severe anxiety; Hallucinations or acute psychosis in some people | Severe | Hallucinations, confusion or delirium; A seizure, confusion, or seeing or hearing things that aren’t there: call 911 |
| Easing | Over days to weeks | Gradual improvement in sleep and anxiety | Mild | Thoughts of suicide or self-harm: call or text 988 now |
Print a daily symptom log for this timeline · My quit tracker
Symptoms, phase by phase
The CDC’s 2020 MMWR report says phenibut use and misuse can cause sedation, respiratory depression and reduced consciousness, as well as withdrawal symptoms including anxiety, agitation and acute psychosis. Of the 1,320 exposures reported to U.S. poison centers in 2009 to 2019, common effects included agitation (30.4%), drowsiness or lethargy (29.0%), fast heart rate (21.9%) and confusion (21.3%); 12.6% had major (life-threatening or disabling) effects. Those figures cover all exposures, not withdrawal alone. Research on withdrawal timing is mostly case reports, so treat the phases as a rough guide.
Early withdrawal: Within a day or so of the last dose in daily users (not well studied)
- Rebound anxiety
- Insomnia
- Restlessness, irritability
Peak withdrawal: The following days (not well studied)
- Agitation
- Severe anxiety
- Hallucinations or acute psychosis in some people
Easing: Over days to weeks
- Gradual improvement in sleep and anxiety
What makes withdrawal longer or shorter
- Daily use and dose. Heavier, more frequent use likely means harder withdrawal.
- Other substances. 40.2% of adult exposures in the CDC data involved other substances too.
- Unregulated products. The CDC report notes that few studies have described the purity of phenibut-containing products, and that the FDA has ruled phenibut cannot be listed as an ingredient in U.S. dietary supplements.
When to see a doctor or get help now
- If you use phenibut daily and want to stop, talk to a doctor first.
- Call 911 for a seizure, hallucinations, severe confusion, a high fever or trouble breathing.
- Call or text 988 for thoughts of suicide.
Not sure where to start? Call SAMHSA’s free, confidential helpline at 1-800-662-4357, 24/7. See Get Help.
Tapering
We didn’t find published guidance on tapering phenibut. We don’t publish dose-by-dose schedules. Your prescriber should set your plan, and adjust it if symptoms appear.
Tips for getting through it
- Tell your doctor exactly what and how much you’ve taken
- Avoid alcohol and other sedatives
- Have someone check on you
Frequently asked questions
Is phenibut withdrawal dangerous?
It can be severe, with agitation and psychosis reported. Get medical help.
How long does phenibut withdrawal last?
There isn’t good data, so we can’t give a reliable answer.
Is phenibut legal?
The CDC describes it as unregulated in the U.S. It’s sold online, but that doesn’t mean it’s safe.
Next steps
Talk to others going through it. Share your experience or ask questions on the Day-by-Day Check-ins board in our community forum. Planning to stop? See the Tapering & Talking to Your Doctor board, and talk to a doctor before you stop. Forum posts are personal experiences, not medical advice. Please read the community guidelines.
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- Benzo Withdrawal Timeline: Short- vs Long-Acting
- Kratom and 7-OH Withdrawal Timeline
- Tianeptine Withdrawal: The 'Gas Station Heroin' Problem
- Kava Withdrawal: What the Research Says
Sources
- CDC MMWR: Phenibut Exposures Reported to Poison Centers, United States, 2009 to 2019
- SAMHSA National Helpline
Last reviewed: October 25, 2026. Researched and written by Withdrawal Timelines from the cited sources. This article has not yet been reviewed by a medical professional. See How We Review and our Medical Disclaimer. This is general information, not medical advice.
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