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Benzylpiperazine (BZP) and TFMPP

Published on May 10, 2024 at 8:00 / Updated on May 25, 2024 at 8:00

The most common synonyms are:

  • A2, Benny, Benny bear, Legal Ecstasy, Exotic super strong, Flying angel, Frenzy, Head rush, MDAI, Nemesis, Party pill, PEP, PEP X, Strong as hell, Twisted, Wicked high, Legal X, XTC, XXX

CNS disruptor (stimulant and hallucinogenic effect):

  • Agent that causes users to see, hear or feel things that do not exist, while stimulating mental functions and increasing the brain's overall alertness.
Visual description
  • Salt: tablet or powder in a variety of colours.
  • Base: yellowish-green liquid, corrosive. Often sold as Ecstasy or as a substitute for amphetamines.
Mechanism of action
  • Its effect is similar to, but weaker than amphetamines. It is ten times less potent than amphetamines.
  • Sympathomimetic effects (effects similar to adrenaline: increased alertness, heart rate and respiratory rate).
  • Increases dopamine levels in the part of the brain that mediates pleasure (mesolimbic area), which results in a feeling of euphoria and happiness.
  • Increases alertness due to its effect on noradrenaline and increases irritability due to tis effct on serotonin.
Routes of administration
  • Oral (the most common), snorted (rare) and injected (rare).

Effects sought out by the user

  • Heightened perceptions (taste, colours, music)
  • Sense of well-being
  • Alertness
  • Euphoria

Common toxic effects

  • Agitation
  • Anxiety
  • Blurred vision
  • Chest pain
  • Confusion
  • Dilated pupils
  • Dizziness
  • Excessive sweating
  • Hallucinations
  • Headache
  • Hypertension
  • Insomnia
  • Involuntary movements
  • Nausea
  • Palpitations
  • Paranoia
  • Reduced appetite
  • Reduced consciousness
  • Sensory impairment (e.g., pins and needles)
  • Shortness of breath
  • Tachycardia
  • Teeth grinding
  • Urinary retention
  • Vomiting

Overdose effects

  • Abnormal increase in body temperature
  • Convulsions
  • Disseminated intravascular coagulation (clotting disorder)
  • Hyperventilation
  • Hyponatremia (low sodium level in blood)
  • Metabolic acidosis (accumulation of acid in the blood)
  • Muscle toxicity
  • Nephrotoxicity
  • Psychosis

Tolerance (need to increase the dose to feel the same effect)



Has not been observed.


Symptoms develop within a few hours/days:

  • Anxiety
  • Dehydration
  • Reduced appetite
  • Pain
  • Fatigue
  • Depressed mood
  • Insomnia
  • Lethargy (abnormal state of drowsiness)
  • Headache
  • Severe dry mouth
  • Muscle spasms
Onset and duration of action
Route of administrationOnset of actionPeakDuration of action
Oral: BZP onlyAbout 6 minutes to 2 hours75 minutesEffects can last up to 12 hours and sometimes more
Oral: TFMPP onlyAbout 25 minutes90 minutesNot available

Intoxication management

  • No antidote available.
  • Treatment is mainly symptomatic. Activated charcoal may be administered if the drug was recently ingested (within less than one hour), and only if taken orally.
Many different street drugs are sold under the same name. Furthermore, nothing guarantees the quantity, purity or even the content of a street drug in spite of the fact that it may, in some cases, look like medication.

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