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Onset is prolonged relative to other depressants. Users should wait 2–3 hours minimum before redosing to avoid unintentional overdose.
In comparison to other commonly used GABAgenic depressants such as alcohol or benzodiazepines, this compound is significantly longer lasting, more euphoric and more recreational.
These combinations are considered extremely harmful and should always be avoided. Reactions to these drugs taken in combination are highly unpredictable and have a potential to cause death.
Phenibut is moderately psychologically addictive, particularly with heavy or frequent use. The extended onset period can lead to compulsive redosing when users mistakenly believe the substance is not working, and rebound anxiety commonly drives continued use.
Physical dependence develops with daily or near-daily use, sometimes within weeks of regular dosing. Withdrawal symptoms can be severe and include anxiety, insomnia, tremors, agitation, rapid heartbeat, nausea, vomiting, irritability, and fatigue. Baclofen has been used successfully to treat phenibut dependence.
Phenibut has low toxicity relative to dose when used alone. Only one death has been documented with phenibut as the sole substance; other associated fatalities involved combinations with CNS depressants. Fatal overdose risk increases significantly when combined with alcohol, opioids, benzodiazepines, or other depressants.
Prolonged use at high doses may cause fatty liver disease; doses above 7 grams have been associated with fatty liver degeneration in overdose cases.
Renal impairment has been reported in overdose cases; this is not a typical concern at standard doses.
Phenibut hydrochloride is highly caustic and may cause intestinal discomfort, diarrhea, and potentially lower digestive tract bleeding in sensitive users.
Eosinophilia has been reported with prolonged high-dose use and in overdose cases.
Acute psychosis and visual/auditory hallucinations have been reported primarily as withdrawal symptoms in recreational users discontinuing heavy use, rather than during intoxication. Withdrawal-associated psychosis appears to occur in cases of abrupt cessation following prolonged high-dose use.
Tonic-clonic seizures have been reported in recreational users who have overdosed. Seizures are not a typical occurrence at standard doses and appear to be associated with significant overdose.
Phenibut was synthesized during the 1960s at the Department of Organic Chemistry at the Al Gertsen Leningrad Pedagogical Institute under the supervision of Professor V. V. Perekalin. Following its development, the compound was researched for potential applications in treating various conditions…
Classified as a prohibited substance as of February 1st, 2018. Possession, importation, supply, and manufacture are illegal.
May be controlled under the Neue-psychoaktive-Stoffe-Gesetz (New Psychoactive Substances Act) as of July 18, 2019. Whether this legislation applies to phenibut remains legally unclear.
Available as an unscheduled prescription drug marketed under the brand name 'Noofen.' Also sold as 'Cognifen' in combination with ipidacrine for cognitive impairment associated with vascular disorders.
Not listed under Buchstabe A, B, C, or D of controlled substances legislation. Generally considered legal to possess.
Not a federally scheduled substance. Legal to possess without license or prescription. Sales, distribution, and labeling are regulated by FDA rules when sold for human consumption. Note that Alabama classified phenibut as a Schedule II controlled substance at the state level as of November 21st, 2021.
Not a controlled substance under Canadian law. Legal to possess without license or prescription.
Classified as a Schedule 1 controlled substance. Possession, production, and distribution are prohibited.
Added to the State Drug Register in 1974 under Order No. 1126 by the USSR Ministry of Public Health. Remains available as a neuropsychotropic medication for conditions including anxiety, depression, PTSD, insomnia, and vestibular disorders.
Not a controlled substance under the Misuse of Drugs Act 1971. However, production, supply, or importation may potentially be prohibited under the Psychoactive Substances Act 2016, which applies blanket restrictions on psychoactive substances with exemptions for alcohol, nicotine, and medicinal products.
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