What is BZP?

Storefront advertising final days of legal BZP
BZP was marketed as a legal high, but is a risky drug to take. bronzebrew / Flickr License: https://creativecommons.org/licenses/by-nd/2.0/

Definition of BZP

What is BZP? BZP, or n-benzylpiperazine, is one of several recently-discovered drugs, often referred to as "novel drugs" or "emerging drugs."

BZP has been identified as a component drug in many seized ecstasy tablets, and has similar subjective effects to MDMA. In fact, its rise in popularity is due at least in part to the decline in the availability of MDMA.

Effects of BZP

BZP is often used in so-called party pills, often in combination with other emergent drugs.

A typical dose of BZP is 75 to 150mg, which can take two hours to take effect, and results in a trip of six to eight hours. It's often mixed with two or three other drugs—combinations that can create a complicated array of effects and symptoms.

In low doses, the effects of BZP are stimulating, similar to amphetamines. Higher doses can result in hallucinogenic effects, including delusions and hallucinations.

These compounds can cause harmful effects when taken recreationally. Commonly-reported features include palpitations, agitation, anxiety, confusion, dizziness, headache, tremor, mydriasis (dilated pupils), insomnia, urinary symptoms, and vomiting. Seizures are induced in some patients even at low doses; if this happens, it's extremely important to get immediate treatment to terminate seizures, which can be life threatening. Severe multiorgan toxicity has been reported, though fatalities have not been recorded conclusively for this substance alone.

When used in combination with other substances, deaths have been reported. Taking an intoxicated person to the emergency room for treatment will usually result in a good recovery.

How to Help Someone Who is High on BZP

Try to remain calm if the person is anxious or panicky, and reassure her that she can get help at the hospital.

Don't worry about the legal consequences, as the staff in the emergency room is only concerned about the person's physical health and safety. Go with her to the emergency room, or call 911 and explain to the medical staff what you think the person has taken. If you have a sample of what has been taken, bring it with you to the hospital, as this can help determine what's causing the symptoms.

While it's important for people who are overheated to remain hydrated (from dancing for an extended period, for example), don't allow someone on BZP to drink a lot of water very quickly, as this can result in a condition called hyponatremia, or water intoxication, especially if he's been sweating excessively. Hyponatremia has been reported by emergency rooms as a risk of BZP intoxication. Sipping water is typically safe, but if someone high on BZP appears dehydrated, it's safest to take him to an emergency room where his fluid and electrolyte balance can be carefully monitored.

Is BZP Legal?

BZP has often been marketed as "legal ecstasy," leading users to mistakenly think that it's both legal and safe to use. Actually, it is neither. In the US, it's a controlled drug, and was given Schedule 1 status in 2004.

As with many emerging drugs marketed in the 2000s as "legal highs," BZP was promoted as legal due to the delay in the substance's being recognized and included in drug control regulations. As is typical of designer drugs, the grey area of apparent legality is now over, and BZP is recognized as a controlled drug in many jurisdictions, with others working on the process of making it illegal.


Cohen, B. & Butler, R. "BZP-party pills: A review of research on benzylpiperazine as a recreational drug." International Journal of Drug Policy 22:95-101. 2011.

Lin, J., Bangs, N., Lee, H., Kydd, R. & Russell, B. "Determining the subjective and physiological effects of BZP on human females." Psychopharmacology 207:439–446. 2009.

Rosenbaum, C., Carreiro, S., and Babu, K. "Here today, gone tomorrow... and back again? A review of herbal marijuana alternatives (K2, Spice), synthetic cathinones (bath salts), kratom, salvia divinorum, methoxetamine, and piperazines." J Med Toxicol 8:15-32. 2012.

Winstock, A. and Wilkins, C. "‘Legal highs:’ The challenge of new psychoactive substances." Transnational Institute. Series on Legislative Reform of Drug Policies Nr. 16. 2011.


Pronunciation: B-Z-P, ben-zil-piper-a-zine

Also Known As: benzylpiperazine, n-benzylpiperazine, legal ecstasy, A2, Benzo Fury, MDAI, Head Rush, XXX Stong as Hell, Exotic Super Strong.

Examples: Rick became ill after taking party pills containing BZP, and was taken to the hospital by ambulance.