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Phenibut Withdrawal: Symptoms, Risks, and Why Medical Help Matters

Phenibut withdrawal symptoms, the risk of seizures and psychosis, and why stopping needs medical supervision.
  • Fact checked
  • Medically Reviewed
Sedona, AZ

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Alternative to Meds Editorial Team
Medically Reviewed by Dr John Motl MD

Phenibut withdrawal at a glance

Phenibut withdrawal can become severe, with agitation, hallucinations, and seizures reported. Don’t stop daily use on your own. If someone has a seizure, is confused, or is seeing or hearing things that aren’t there, call 911.

What it is
A GABA-like drug used as a medicine in Russia, sold online in the US as a “supplement” or nootropic
How it acts
Mainly on GABA-B receptors, like baclofen, and on the same calcium-channel target as gabapentin
Common symptoms
Anxiety, insomnia, irritability, agitation, rapid heartbeat, tremor
Severe symptoms
Hallucinations, psychosis, delirium, and seizures
When it starts
As soon as a few hours after the last dose
Safest approach
Medically supervised withdrawal; published cases of abrupt stopping were treated in the hospital
Legal status
As of October 2026, not federally controlled, but FDA says it is not a lawful dietary ingredient; Utah lists it in Schedule I
At ATMC
Residential addiction care in Sedona, Arizona, with referral to hospital care first if acute withdrawal needs it
Withdrawal symptomsTimelineStopping safelyGet help
Table of contents (12)

What is phenibut withdrawal?

Phenibut withdrawal is the set of symptoms that can start when someone who takes phenibut regularly stops or cuts back. Common symptoms are anxiety, insomnia, irritability, and agitation. In some people it escalates to hallucinations, psychosis, or seizures.8,9

Doctors compare it to withdrawal from benzodiazepines or alcohol, which can also be dangerous.11,22 In a review of 25 published cases, 44% of patients were admitted to intensive care and 8% had seizures.9 That is why phenibut withdrawal should be handled with medical help, not alone at home.

Withdrawal is a sign that your body has adapted to the drug, not a personal failing. It is treatable, and help is available.

Looking for help? See how our residential addiction treatment program in Sedona works, or call (888) 907-7075.

What is phenibut?

Short answer: phenibut (beta-phenyl-GABA) is a calming drug introduced into medical use in Russia in the 1960s. It is still used there and in a few other countries for anxiety and sleep, but it is not approved as a medicine in the United States.3,5,6

In the US, phenibut is sold online and in some shops as a “nootropic,” a sleep aid, or an anxiety supplement. It often comes as powder, capsules, or drink mixes. A survey of online sellers and drug forums found that people take it for its calming and euphoric effects, and that tolerance and withdrawal were commonly reported.18

Phenibut works mainly on GABA-B receptors, the same target as the muscle relaxant baclofen, and to some extent on GABA-A receptors.6 It also binds the same calcium-channel site that gabapentin and pregabalin act on.7 With daily use, the brain adjusts to that calming effect, and tolerance and dependence can follow.

Is phenibut legal in the US?

The rules are a patchwork. As of October 2026, phenibut is not on the Drug Enforcement Administration’s federal list of controlled substances.4 The FDA, however, says phenibut does not meet the legal definition of a dietary ingredient, so a supplement that lists it is misbranded. The FDA sent warning letters to sellers in 2019, and a federal court ordered a company to stop selling phenibut drink powders in 2023.1,2

Some states go further. Utah added phenibut to Schedule I in 2025, and Maryland restricted its retail sale starting October 1, 2025.16,17 State laws change, so check your state’s current rules.

Can you trust the label?

Often, no. When researchers tested four phenibut supplements after FDA’s warnings, the amount per serving ranged from 21 mg to 1,164 mg, and the amount went up in three of the four brands.15 Another study found unlisted drugs in “brain-boosting” supplements, and most listed amounts were wrong.23 If you can’t know how much you take, you can’t safely plan to cut down on your own.

Phenibut withdrawal symptoms

Short answer: the most commonly reported symptoms are anxiety, irritability or agitation, insomnia, and psychosis.8 Nearly all published withdrawal cases involved daily use.8

Common symptoms can include:

  • Mood: anxiety, irritability, low mood, and fatigue5,8
  • Sleep: severe insomnia5,8
  • Body: tremor, rapid or pounding heartbeat, dizziness, nausea, and vomiting5,10
  • Behavior: restlessness and agitation8,10

Severe symptoms reported in published cases:

  • Hallucinations, delusions, and psychosis5,8
  • Delirium (sudden confusion and disorientation)22
  • Severe agitation that needed strong medicines to control10
  • Seizures5,9

Some cases have nervous system signs and swings in heart rate, blood pressure, or temperature that can look like other serious drug reactions. Doctors need to sort these out in a hospital.10

Know the limits of the evidence. What we know comes from case reports and poison center data. Many people in these reports also used other substances, and product strength was often unknown.5,9

Struggling to stop phenibut? Talk to our team about a safe plan, including hospital-level care first if you need it.

Call (888) 907-7075Free, confidential consultation

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Phenibut withdrawal timeline

Short answer: symptoms can begin within hours of the last dose and may get worse over the first day or two. In hospital cases, treatment lasted about a week on average, though some people needed much longer.8,9

No study has mapped a standard phenibut withdrawal timeline. The table below is based on published case reports and reviews.

Time since last dose What may happen What we know
First few hours Anxiety, restlessness, insomnia, rapid heartbeat Reviewers report onset as soon as 2 hours after the last dose.9 One patient had symptoms within 3 to 4 hours.12
First 1 to 3 days Symptoms can escalate to severe agitation, hallucinations, delirium, or seizures In one review, 64% of patients got worse within the first 24 hours of seeking care, 24% needed a breathing tube, and 44% went to intensive care.9
About 1 to 2 weeks Acute symptoms gradually settle with treatment Average hospital stay for phenibut withdrawal was 7.7 days, ranging from under a day to 30 days.8
Weeks after Anxiety, poor sleep, and low mood may linger Little phenibut-specific data. After other sedatives, some symptoms can last weeks or months.19

Your own timeline depends on how long and how much you used, whether you mixed phenibut with alcohol or other drugs, and your overall health.

Is phenibut withdrawal dangerous?

Short answer: yes, it can be. Seizures, delirium, and psychosis have all been reported, and many patients in published cases needed intensive care.9,10

Phenibut itself also carries risk. US poison centers recorded 1,320 phenibut exposures from 2009 to 2019, with agitation, drowsiness, rapid heartbeat, and confusion the most common effects. About 6% of people were in a coma, and three died.3 A regional poison center found that about 1 in 5 of its phenibut cases needed a breathing tube.20

Mixing phenibut with alcohol, benzodiazepines, opioids, or gabapentin adds to the danger, because these also slow the brain and breathing. Tell your clinician about everything you take.

How to stop phenibut safely

Short answer: don’t stop daily phenibut suddenly, and don’t design your own taper. Plan the stop with a clinician, ideally one experienced in addiction medicine. In the published cases of abrupt stopping, everyone was treated as an inpatient.9

Why a do-it-yourself plan is risky:

  • Severe symptoms can appear fast. Agitation, psychosis, or seizures can develop within a day.9
  • You may not know your dose. Product strength varies widely and labels are often wrong.15
  • There is no standard protocol. Experts say treatment should be individualized and guided by specialists.9,13

What clinicians may do:

  • Assess first. How much and how often you use, other substances, seizure history, and mental health shape the plan.
  • Use medicines to keep you safe. Doctors have used baclofen, benzodiazepines, phenobarbital, antipsychotics, dexmedetomidine, and gabapentinoids. Most patients needed two or more medicines.8,9,13 One patient had a seizure while on baclofen alone, which shows why these decisions belong with an experienced team.14
  • Taper under supervision. Some cases describe switching to a prescribed medicine and then reducing it slowly under medical care.11,12
  • Plan for after. Many people started phenibut to manage anxiety or sleep. Those problems need their own care once withdrawal is over.

Please don’t try to work out doses or timing on your own, and don’t replace phenibut with alcohol, benzodiazepines, or someone else’s medication.

Taking gabapentin or a benzodiazepine too? These act in similar ways and also need a careful, supervised taper.

Read about gabapentin withdrawal

Helping a loved one through phenibut withdrawal

Many people start phenibut believing it is a safe supplement. Families are often the first to notice that something has changed.

  • Learn the signs. Daily use, packages from online sellers, and anxiety, shakiness, or sleeplessness when they run out can point to dependence.
  • Watch for danger signs. Confusion, seeing or hearing things, extreme agitation, or a seizure means call 911.9
  • Take talk of suicide seriously. Call or text 988 any time, or 911 in an emergency.21
  • Stay calm and specific. Talk about what you have seen and that you are worried, not about blame.
  • Help them get assessed. Offer to make the first call with them or drive them to an appointment.

Family members are welcome to call. Our admissions team can answer questions about a loved one’s situation, confidentially, at (888) 907-7075.

Stopping phenibut at home vs. at ATMC

At home At ATMC
Withdrawal Managed largely on your own Monitored by medical and nursing staff, with referral to hospital care first if needed
Support Scheduled appointments, if any Staff available 24/7
Triggers The same online orders, stress, and routines A calm residence in Sedona, away from daily triggers
Root causes Rarely tested Lab testing on arrival, nutrition, and holistic detox
Therapy Usually an hour a week Individual, group, and holistic therapies daily
Anxiety and sleep Often treated separately, or not at all Dual diagnosis care treats both together
See where you’d stayTour our Sedona residence →Hear from clientsReal recovery stories →

When to get help right away

  • Call 911 for a seizure, confusion, hallucinations, severe agitation, a racing heart with chest pain, or if someone is hard to wake or breathing slowly.3,9
  • Call Poison Help at 1-800-222-1222 with questions about a phenibut exposure, including a child who swallowed some.24
  • Call or text 988 for the Suicide and Crisis Lifeline, free and open 24/7.21
  • Call the SAMHSA National Helpline at 1-800-662-4357 for confidential treatment referrals at no cost, 24/7.25

Get help with phenibut dependence

Alternative to Meds Center is a residential treatment center in Sedona, Arizona, with about 20 years of holistic residential care. We help people with dependence on sedatives, sleeping pills, benzodiazepines, and other substances. Because phenibut withdrawal resembles sedative withdrawal, we approach it with the same medical caution.

Phenibut withdrawal often needs hospital-level care first. When that’s the case, we refer you to an acute care facility, then help you transition into our residential program. At ATMC, detox happens under the observation of trained medical staff, who watch your vital signs and overall health.

Every resident gets lab testing and a medical assessment on arrival. From there, your plan may include holistic detox, neurotransmitter repair with an individualized supplement plan, whole-food nutrition, individual and group counseling, and peer support. If anxiety, insomnia, or depression led you to phenibut, our dual diagnosis program treats both at the same time.

Our Medical Director describes how the team watches over each client:

“Our medical and nursing teams collaborate closely to monitor each client’s tapering plan, assess progress, and make adjustments as clinically indicated. The team regularly evaluates symptoms, sleep patterns, mood, and overall well-being to support a safe and individualized process.”
Kimberli Galloway, PMHNP-BC, Medical Director

Learn more about our addiction treatment program, sedative and sleeping pill dependence, benzodiazepine withdrawal, and supervised medication tapering.

Talk to our admissions team. Ask about phenibut, what a stay looks like, and insurance. Family members are welcome to call.

Call (888) 907-7075Free, confidential consultation

Prefer to write? Contact admissions online →

Phenibut withdrawal FAQs

How long does phenibut withdrawal last?
There is no standard timeline. Symptoms can start within hours, and in hospital cases the average stay was about a week, ranging from under a day to 30 days.8,9 Anxiety and sleep problems may last longer. A clinician can tell you what to expect in your situation.
Can phenibut withdrawal cause seizures?
Yes. Seizures were reported in 8% of published withdrawal cases, and delirium and psychosis have also been described.9,22 This is the main reason phenibut withdrawal needs medical supervision. Call 911 if someone has a seizure.
Can you die from phenibut withdrawal?
Withdrawal can become life-threatening because of seizures, delirium, and severe agitation, and many published cases needed intensive care.9 Phenibut use itself has been linked to coma and deaths in poison center reports.3 Medical care lowers these risks.
Is phenibut withdrawal like benzo withdrawal?
In many ways, yes. Doctors describe phenibut withdrawal as resembling benzodiazepine or alcohol withdrawal, including the risk of seizures and delirium.11,22 It acts mainly on GABA-B receptors, though, so treatment is not identical.6
Can I taper off phenibut at home?
Please don’t plan it on your own. Product strength is unpredictable, there is no standard protocol, and severe symptoms can appear quickly.9,15 Talk to a clinician first. They may recommend a supervised taper or a hospital stay, depending on your use and health.
What medications help phenibut withdrawal?
Doctors have used baclofen, benzodiazepines, phenobarbital, and other medicines, often in combination.8,9,13 There are no head-to-head studies, and choices depend on the person, so these medicines should only be used under a prescriber’s care.9
Is phenibut legal?
As of October 2026 it is not federally controlled, but FDA says it is not a lawful dietary supplement ingredient.1,4 Utah lists it in Schedule I and Maryland restricts its sale.16,17 Check your state’s current law.
Is phenibut the same as gabapentin?
No, but they overlap. Phenibut acts mainly on GABA-B receptors, and it also binds the same calcium-channel site as gabapentin.6,7 Both can cause dependence and withdrawal when used daily.

Sources:

1. U.S. Food and Drug Administration. Phenibut in Dietary Supplements. Content current as of July 12, 2023. [cited 2026 Oct 20]

2. U.S. Food and Drug Administration. FDA Acts on Dietary Supplements Containing DMHA and Phenibut. Constituent Update, April 16, 2019. [cited 2026 Oct 20]

3. Graves JM, Dilley J, Kubsad S, Liebelt E. Notes from the Field: Phenibut Exposures Reported to Poison Centers, United States, 2009-2019. MMWR Morb Mortal Wkly Rep. 2020;69(35):1227-1228. doi:10.15585/mmwr.mm6935a5. PMID: 32881852. [cited 2026 Oct 20]

4. Drug Enforcement Administration, Diversion Control Division. Controlled Substances, Alphabetical Order. [cited 2026 Oct 20]

5. Food and Drug Administration. International Drug Scheduling; Convention on Psychotropic Substances; Single Convention on Narcotic Drugs; WHO Scheduling Recommendations. Federal Register. 2022;87 FR 8586. February 15, 2022. [cited 2026 Oct 20]

6. Lapin I. Phenibut (beta-phenyl-GABA): a tranquilizer and nootropic drug. CNS Drug Rev. 2001;7(4):471-481. doi:10.1111/j.1527-3458.2001.tb00211.x. PMID: 11830761. [cited 2026 Oct 20]

7. Zvejniece L, Vavers E, Svalbe B, Veinberg G, Rizhanova K, Liepins V, et al. R-phenibut binds to the α2-δ subunit of voltage-dependent calcium channels and exerts gabapentin-like anti-nociceptive effects. Pharmacol Biochem Behav. 2015;137:23-29. doi:10.1016/j.pbb.2015.07.014. PMID: 26234470. [cited 2026 Oct 20]

8. Weleff J, Kovacevich A, Burson J, Nero N, Anand A. Clinical Presentations and Treatment of Phenibut Toxicity and Withdrawal: A Systematic Literature Review. J Addict Med. 2023;17(4):407-417. doi:10.1097/ADM.0000000000001141. PMID: 37579098. [cited 2026 Oct 20]

9. Feldman R, Autry B, Dukes J, Lofy T, Marchetti G, Patt A, et al. A systematic review of phenibut withdrawal focusing on complications, therapeutic approaches, and single substance versus polysubstance withdrawal. Clin Toxicol (Phila). 2023;61(11):941-951. doi:10.1080/15563650.2023.2285702. PMID: 38112312. [cited 2026 Oct 20]

10. Hardman MI, Sprung J, Weingarten TN. Acute phenibut withdrawal: A comprehensive literature review and illustrative case report. Bosn J Basic Med Sci. 2019;19(2):125-129. doi:10.17305/bjbms.2018.4008. PMID: 30501608. [cited 2026 Oct 20]

11. Ahuja T, Mgbako O, Katzman C, Grossman A. Phenibut (β-Phenyl-γ-aminobutyric Acid) Dependence and Management of Withdrawal: Emerging Nootropics of Abuse. Case Rep Psychiatry. 2018;2018:9864285. doi:10.1155/2018/9864285. PMID: 29854531. [cited 2026 Oct 20]

12. Samokhvalov AV, Paton-Gay CL, Balchand K, Rehm J. Phenibut dependence. BMJ Case Rep. 2013;2013:bcr2012008381. doi:10.1136/bcr-2012-008381. PMID: 23391959. [cited 2026 Oct 20]

13. Penzak SR, Bulloch M. Phenibut: Review and Pharmacologic Approaches to Treating Withdrawal. J Clin Pharmacol. 2024;64(6):652-671. doi:10.1002/jcph.2414. PMID: 38339875. [cited 2026 Oct 20]

14. Patt A, Fox H, Wells L, Theobald J, Feldman R. Seizure Occurring During Baclofen Monotherapy for Phenibut Withdrawal. Clin Neuropharmacol. 2023;46(2):79-81. doi:10.1097/WNF.0000000000000542. PMID: 36735548. [cited 2026 Oct 20]

15. Cohen PA, Ellison RR, Travis JC, Gaufberg SV, Gerona R. Quantity of phenibut in dietary supplements before and after FDA warnings. Clin Toxicol (Phila). 2022;60(4):486-488. doi:10.1080/15563650.2021.1973020. PMID: 34550038. [cited 2026 Oct 20]

16. Utah State Legislature. H.B. 173 Controlled Substances Act Amendments (Enrolled Copy). 2025 General Session; effective May 7, 2025. [cited 2026 Oct 20]

17. Maryland General Assembly. HB0996, JT Alvey Phenibut Consumer Protection Act. Chapter 704 of 2025; effective October 1, 2025. [cited 2026 Oct 20]

18. Owen DR, Wood DM, Archer JR, Dargan PI. Phenibut (4-amino-3-phenyl-butyric acid): Availability, prevalence of use, desired effects and acute toxicity. Drug Alcohol Rev. 2016;35(5):591-596. doi:10.1111/dar.12356. PMID: 26693960. [cited 2026 Oct 20]

19. Substance Abuse and Mental Health Services Administration. Protracted Withdrawal. Substance Abuse Treatment Advisory, Volume 9, Issue 1, July 2010. HHS Publication No. (SMA) 10-4554. [cited 2026 Oct 20]

20. McCabe DJ, Bangh SA, Arens AM, Cole JB. Phenibut exposures and clinical effects reported to a regional poison center. Am J Emerg Med. 2019;37(11):2066-2071. doi:10.1016/j.ajem.2019.02.044. PMID: 30878413. [cited 2026 Oct 20]

21. 988 Suicide and Crisis Lifeline. 988lifeline.org. [cited 2026 Oct 20]

22. Bonnet U, Scherbaum N, Schaper A, Soyka M. Phenibutan: An Illegal Food Supplement With Psychotropic Effects and Health Risks. Dtsch Arztebl Int. 2024;121(7):222-227. doi:10.3238/arztebl.m2024.0003. PMID: 38377332. [cited 2026 Oct 20]

23. Cohen PA, Avula B, Wang YH, Zakharevich I, Khan I. Five Unapproved Drugs Found in Cognitive Enhancement Supplements. Neurol Clin Pract. 2021;11(3):e303-e307. doi:10.1212/CPJ.0000000000000960. PMID: 34484905. [cited 2026 Oct 20]

24. Health Resources and Services Administration. Poison Help. [cited 2026 Oct 20]

25. Substance Abuse and Mental Health Services Administration. SAMHSA’s National Helpline. [cited 2026 Oct 20]


This content has been reviewed and approved by a licensed physician.

Dr. John Motl, M.D.

Dr. Motl is currently certified by the American Board of Psychiatry and Neurology in Psychiatry, and Board eligible in Neurology and licensed in the state of Arizona.  He holds a Bachelor of Science degree with a major in biology and minors in chemistry and philosophy. He graduated from Creighton University School of Medicine with a Doctor of Medicine.  Dr. Motl has studied Medical Acupuncture at the Colorado School of Traditional Chinese Medicine and at U.C.L.A.

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Medical disclaimer

This article is for educational purposes only and does not provide medical advice, diagnosis, or treatment. Never start, stop, or change a prescription medication without consulting a qualified healthcare professional who understands your medical history. If you are experiencing an immediate medical or safety emergency, call 911.