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Phenazepam (fenazepam) is a long-acting benzodiazepine and psychoactive drug. Benzodiazepines produce anxiolytic and sedative effects on the body and central nervous system (CNS), resulting in feelings of calm and relaxation. Phenazepam is sold as a fine white powder or liquid.
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In the U.S., phenazepam is not classified as a controlled substance but is nonetheless illegal to sell for human consumption. This drug is considered a class C drug in the U.K., which means it has the least risk for harm.
This legal gray area has allowed it to gain popularity as an illicit drug that is sometimes sold online and in retail stores as entirely different products, such as incense, air fresheners, or a “research chemical.”
Street names for phenazepam include:
Phenazepam was developed in the Soviet Union for the treatment of anxiety and other psychiatric disorders. It was first prescribed in 1978 and remains in use in Russia and the Commonwealth of Independent States (CIS) countries.
In addition to anxiety, phenazepam is used to treat a range of problems including:
Phenazepam can also treat certain neurological disorders, epilepsy, and also works as an anticonvulsant. However, the powerful anti-anxiety and muscle relaxant properties of the drug make it twice as likely to be abused.
In countries where doctors prescribe phenazepam, doses generally come in tablets of 0.5 to 1 mg, as well as transdermal patches or an injectable solution.
While the toxicity of phenazepam is relatively low in relation to dosage, it still carries the addiction, overdose, and withdrawal risks associated with benzodiazepines. Additionally, the drug is potent at one-tenth of the normal dose of diazepam.
Higher doses of phenazepam are sometimes prescribed for severe anxiety or epileptic seizures.
There are a range of possible side effects from minor to extremely serious and warranting emergency help. More general side effects that may subside naturally or with adjusted dosages include:
More severe side effects can appear, especially if a user takes phenazepam in big doses or without a prescription:
Some people use phenazepam as a "chill out drug" when they are coming down from speed, ecstasy, or acid. Taking the drug in this way is extremely dangerous and can lead to an overdose or death, especially when taken in high doses.
Phenazepam has a half-life of up to 60 hours, making it among longer-lasting benzodiazepines and potentially delaying the onset of withdrawal symptoms for up to five days.
People taking long-lasting benzodiazepines generally have greater success tapering off their usage.
As with other benzodiazepines, phenazepam can be extremely dangerous or deadly when misused or in combination with alcohol and other Central Nervous System (CNS) depressants. In the U.S., the U.K., and other countries where phenazepam is illegal or not approved for humans, consumers who obtain it are at risk of ingesting unknown and harmful additives.
Even when prescribed, it requires special caution for those with existing drug dependencies, as well as children, the elderly, and pregnant women.
As with all benzodiazepines, the use of phenazepam in combination with other drugs that are central nervous system (CNS) depressants is especially dangerous and is the primary cause of death associated with phenazepam use.
When illegally obtained, it is often already combined with other intoxicants, such as synthetic cannabinoid products. Phenazepam can have a more neutralizing effect with stimulants such as cocaine.
Discontinuing even a short-term, therapeutic dose of phenazepam can potentially cause many difficult withdrawal symptoms if discontinuation is improperly tapered. These symptoms include:
Due to its high potential for dependency and abuse, phenazepam is generally prescribed short-term. Early signs of addiction can be hard to distinguish from general side effects, including such things as headaches, confusion, and fatigue. More severe signs of abuse include depression, anxiety, brain damage, and suicidal behaviors.
Often, phenazepam addiction accompanies other difficulties, such as:
From 2008 to 2018, the United States Drug Enforcement Administration produced 562 reports that included instances of phenazepam intended for illegal human consumption, with the highest rates in 2013.— Drug Enforcement Administration, Diversion Control Division Drug & Chemical Evaluation Section
When overdosed, benzodiazepines such as phenazepam are extremely dangerous and potentially fatal. This is in part because the threshold for overdose is dependent on a person’s existing tolerance.
Illegal users often take benzodiazepines with other intoxicants and CNS depressants, greatly increasing the risk of experiencing overdose symptoms, which include:
The proper tapering of a prescribed schedule of phenazepam will mitigate many effects of withdrawal; however, where addiction has developed by illicit use or long-term treatment, more structured treatment options become necessary.
For those who are prescribed phenazepam or other benzodiazepines, the most basic way of managing a dependency might be the implementation of staged dispensing. This is a practice where a medical provider issues small prescriptions to a patient on a frequent basis, preventing them from taking large doses and forcing them to taper.
In the U.S., U.K., China, and elsewhere, any use of phenazepam is illegal and likely in the context of benzodiazepine addiction needing serious treatment. Treatment approaches vary as does their success with different individuals, but any treatment programs or routines should be evidence-based and have a demonstrated history of success.
Treatment plans for phenazepam will include two broad components:
The range of addiction recovery settings and services include:
This treatment option is appropriate in high-risk situations of detoxification that require constant monitoring and access to medical services.
Short-term detox and longer-term treatment programs may be appropriate for those who need significant daily lifestyle changes and support. These programs can range from one week to several months, with most long-term treatments lasting one to three months.
Patients who are able to continue their daily lives while tapering and recovering from phenazepam addiction may be best served in outpatient programs that offer a range of intensities and support programs with less disruption to the patient’s life.
Addiction and its associated behaviors are impacted by, and have an impact on, one’s psychological state. Regardless of the treatment method one uses, therapy is a helpful tool in the recovery process and a central part of comprehensive treatment programs.
While not necessarily direct treatment, peer support in group settings or informally, as well as peer mentorship, are often positive and powerful additions to a treatment protocol.
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Authier, N., et al. "Benzodiazepine dependence: focus on withdrawal syndrome." Annales pharmaceutiques francaises. Vol. 67. No. 6. Elsevier Masson, 2009.
Brett, Jonathan, and Bridin Murnion. "Management of benzodiazepine misuse and dependence." Australian prescriber 38.5 (2015): 152.
“Depressant.” Taxonomy, United States Drug Enforcement Administration, www.dea.gov/taxonomy/term/316.
Drug and Chemical Evaluation Section. “Phenazepam (Street Names: Bonsai, Soviet Benzo, Fenaz, Panda).” Diversion Control Division. Drug Enforcement Administration, July, 2019. www.deadiversion.usdoj.gov/drug_chem_info/phenazepam.pdf
Lann, Meredith A., and D. Kimberley Molina. "A fatal case of benzodiazepine withdrawal." The American journal of forensic medicine and pathology 30.2 (2009): 177-179.