white → yellow2
Citation noticeOur citation system is being overhauled
References and citation markers may currently be incomplete, mismatched, or incorrect. This system is being rebuilt and reviewed before the full site launch.
Dosage & Duration
Dosage
Doses are population estimates that vary widely between individuals.
Threshold~40 mg
Light40-70 mg
Moderate70-100 mg
Strong100-130 mg
Heavy130+ mg
Duration
Onset30-45 minutes
After Effects2-4 hours
Total4-6 hours
Subjective Effects
Subjective Effects not written up yet
Pharmacology
Pharmacology not written up yet
Interactions
Interactions not written up yet
An unlisted combination is an unknown one, not a safe one. Check a dedicated combination chart before mixing.
Tolerance
Tolerance not written up yet
Harm Potential
Addiction & Dependence
Psychological
ModerateBZP has amphetamine-like effects and was identified as liable to abuse during early research. Studies indicate it can substitute for methamphetamine in addicted animals, though it is approximately one-tenth as potent and produces correspondingly weaker addictive effects.
Toxicity
Lethal Dosage
Deaths from BZP alone are extremely rare, but at least one fatality has been attributed to BZP ingestion alone with a measured blood concentration of 8 mg/L. Multiple deaths have been reported when BZP was combined with alcohol, TFMPP, or MDMA.
Renal
Renal toxicity has been reported as an adverse effect following BZP use, though specific conditions predisposing to this outcome are not well characterized.
Central Nervous System
BZP can cause unpredictable and serious toxicity in some individuals, including life-threatening seizures with status epilepticus; fourteen toxic seizures were recorded in two patients who also developed severe respiratory and metabolic acidosis.
Respiratory
Respiratory failure has been reported among the more severe toxic effects of BZP use.
Musculoskeletal
Rhabdomyolysis has been reported as a severe toxic effect of BZP use.
Psychosis Risk
Acute psychosis and adverse psychiatric events have been reported following BZP use. Hallucinations, confusion, agitation, and anxiety are among the documented side effects.
Seizure Risk
Seizures are a documented serious adverse effect of BZP. Life-threatening toxicity with status epilepticus has been recorded, with fourteen toxic seizures observed in two patients who also developed severe respiratory and metabolic acidosis. BZP can cause unpredictable and serious toxicity in some individuals.
History & Culture
History & Culture not written up yet
Legality
International
Controlled internationally under the UN Convention on Psychotropic Substances 1971.
By Country
Illegal6
United StatesIllegalUnder federal law, N-Benzylpiperazine (BZP) is listed as a Schedule I stimulant in 21 C.F.R. § 1308.11(f)(3), with permanent placement effective March 18, 2004. The listing covers any quantity in a material, compound, mixture, or preparation, including its salts, isomers, and salts of isomers. Except as authorized by the Controlled Substances Act, knowing or intentional manufacture, distribution, dispensing, possession with intent to undertake those acts, and simple possession are unlawful; simple possession also has statutory exceptions for a substance obtained directly or under a valid prescription or order from a practitioner acting in professional practice.
AustraliaIllegalBenzylpiperazine (BZP) is listed by exact name in Schedule 9 of the Therapeutic Goods (Poisons Standard—June 2026) Instrument 2026. Schedule 9 covers substances whose manufacture, possession, supply or use should be prohibited by law, subject to approved medical or scientific research and analytical, teaching or training purposes; its classifications are implemented through State and Territory legislation. The Criminal Code Regulations 2019 also list benzylpiperazine as a controlled drug, and section 308.1 of the Commonwealth Criminal Code makes possession punishable by imprisonment for 2 years, 400 penalty units, or both.
CanadaIllegalBenzylpiperazine (BZP), namely 1-benzylpiperazine and its salts, isomers, and salts of isomers, is listed in Schedule III, item 33 of the Controlled Drugs and Substances Act. The listing took effect on 30 March 2012. The Act prohibits unauthorized possession, trafficking, possession for trafficking, import, export, and production of Schedule III substances, subject to statutory and regulatory authorizations and exceptions.
FinlandIllegalValtioneuvoston asetus huumausaineina pidettävistä aineista, valmisteista ja kasveista (543/2008), liite II56789
BZP is listed as N-bentsyylipiperatsiini (BZP), chemically identified as 1-bentsyyli-1,4-diatsasykloheksaani, in List II of Annex II to Decree 543/2008 and is therefore classified as a narcotic drug. Its production, manufacture, import, export, transport, transit, distribution, trade, handling, possession, and use are prohibited, subject to statutory exceptions for medical, research, and control purposes. BZP has been expressly controlled under the decree since 1 September 2008, and the operative Annex II retained it when replaced with effect from 25 April 2025.
New ZealandIllegalBZP is listed by exact name in Schedule 3 Part 1 clause 2 of the Misuse of Drugs Act 1975 as a Class C controlled drug. The classification took effect on 1 April 2008; possession, use, supply, and administration are controlled subject to licences, regulations, exemptions, and statutory defences.
United KingdomIllegal1-Benzylpiperazine (BZP) is named in Schedule 2 Part III paragraph 1(ca) of the Misuse of Drugs Act 1971 and has been a Class C controlled drug since 23 December 2009. The Act restricts possession, possession with intent to supply, production, supply, offering to supply, import, and export, subject to applicable regulations, licences, exceptions, and statutory defences.
References
Source Pages
Citations
Further Reading
Article Status
Step 1 · Automated synthesisAn autonomous workflow built by Josie Kins compiled this article's foundation from information published across the web.
- Step 2 · First-pass reviewPending
Not yet reviewed: this article is pending editorial review by Lyrea.
- Step 3 · Citation reviewPending
No one has reviewed this article's citations yet. That second pass checks each claim against the source it cites.
Suggest an edit
Spotted a mistake, an outdated claim, or something missing from the BZP article? Send the editors a private note. Feedback lands in a moderation queue and is never shown on the site.
Wish to give generalised feedback? You can do so here.
