Systematic (IUPAC) name
Clinical data
Pregnancy cat.  ?
Legal status Prohibited (S9) (AU) Unscheduled in US. Class C drug in New Zealand , II-P(Poland)[1]
Routes Oral
CAS number 15532-75-9
ATC code None
PubChem CID 4296
ChemSpider 4145
Chemical data
Formula C11H13F3N2 
Mol. mass 230.23 g/mol

3-Trifluoromethylphenylpiperazine (TFMPP) is a recreational drug of the piperazine chemical class. Usually in combination with its analogue benzylpiperazine (BZP), it is sold as a legal alternative to the illicit drug MDMA ("Ecstasy") under the name "Legal X".[2][3]



TFMPP has affinity for the 5-HT1A (Ki = 288 nM), 5-HT1B (Ki = 132 nM), 5-HT1D (Ki = 282 nM), 5-HT2A (Ki = 269 nM), and 5-HT2C (Ki = 62 nM) receptors, and functions as a full agonist at all sites except the 5-HT2A receptor, where it acts as a weak partial agonist or antagonist.[4] Unlike the related piperazine compound meta-chlorophenylpiperazine (mCPP), TFMPP has insignificant affinity for the 5-HT3 receptor (IC50 = 2,373 nM).[5] TFMPP also binds to the SERT (EC50 = 121 nM) and evokes the release of serotonin.[4] It has no effects on dopamine or norepinephrine reuptake or efflux.[4]

Use and effects

TFMPP is rarely used by itself. In fact, TFMPP reduces locomotor activity and produces aversive effects in animals rather than self-administration, which probably explains the decision of the DEA not to permanently make TFMPP a controlled substance.[4] More commonly, TFMPP is co-administered with BZP, which acts as a norepinephrine and dopamine releasing agent.[6] Due to the serotonin agonist effects and increase in serotonin, norepinephrine, and dopamine levels produced by the BZP/TFMPP combination, this mixture of drugs produces effects which crudely mimic those of MDMA.[7]

The dosage commonly used when combined with BZP for "ecstasy-like effects" is between 30 and 100 mg, while higher doses of TFMPP alone cause mildly hallucinogenic effects at around 100–250 mg; however, higher doses can cause a range of side effects including migraine headaches, muscle aches, nausea and vomiting, as well as a come-down syndrome characterized by insomnia, loss of appetite, and headache (see below). These side effects tend to discourage use of TFMPP.

Side effects

The combination of BZP and TFMPP has been associated with a range of side effects, including insomnia, anxiety, nausea and vomiting, headaches and muscle aches which may resemble migraine, seizures, impotence, and rarely psychosis,[3] as well as a prolonged and unpleasant hangover effect similar to that produced by alcohol. These side effects tend to be significantly worsened when the BZP/TFMPP mix is consumed alongside alcohol, especially the headache, nausea, and hangover.

However, it is difficult to say how many of these side effects are produced by TFMPP itself, as it has rarely been marketed without BZP also being present, and all of the side effects mentioned are also produced by BZP (which has been sold as a single drug). Studies into other related piperazine drugs such as mCPP suggest that certain side effects such as anxiety, headache and nausea are common to all drugs of this class, and pills containing TFMPP are reported by users to produce comparatively more severe hangover effects than those containing only BZP. The drug can also cause the body to tremble for a long period of time.[8]

Legal status

TFMPP is off-white, yellowish in color.

As of December 3, 2005, TFMPP is illegal in Denmark. As of March 1, 2006, TFMPP is scheduled as a "dangerous substance" in Sweden.[9] TFMPP is unscheduled in the Netherlands. TFMPP was briefly emergency scheduled in Schedule I in the USA, but the scheduling expired in April 2004 and has not been renewed.[10] Therefore, unlike its cousin benzylpiperazine, TFMPP is not currently an illicit drug under United States federal law. However, some states have banned the drug in their criminal statutes making its possession a felony.

Based on the recommendation of the EACD, the New Zealand government has passed legislation which placed BZP, along with the other piperazine derivatives TFMPP, mCPP, pFPP, MeOPP and MBZP, into Class C of the New Zealand Misuse of Drugs Act 1975. A ban was intended to come into effect in New Zealand on December 18, 2007, but the law change did not go through until the following year, and the sale of BZP and the other listed piperazines became illegal in New Zealand as of 1 April 2008. An amnesty for possession and usage of these drugs remained until October 2008, at which point they became completely illegal.[11]

As of December 2009 TFMPP has been made a Class C drug in the UK along with BZP.

See also


  1. ^ = WDU20111050614 "Ustawa z dnia 15 kwietnia 2011 r. o zmianie ustawy o przeciwdziałaniu narkomanii ( Dz.U. 2011 nr 105 poz. 614 )". Internetowy System Aktów Prawnych. = WDU20111050614. Retrieved 17 June 2011. 
  2. ^ erowid
  3. ^ a b Schep LJ, Slaughter RJ, Vale JA, Beasley DM, Gee P (March 2011). "The clinical toxicology of the designer "party pills" benzylpiperazine and trifluoromethylphenylpiperazine". Clin Toxicol (Phila) 49 (3): 131–41. doi:10.3109/15563650.2011.572076. PMID 21495881. 
  4. ^ a b c d Baumann MH, Clark RD, Budzynski AG, Partilla JS, Blough BE, Rothman RB (March 2005). "N-substituted piperazines abused by humans mimic the molecular mechanism of 3,4-methylenedioxymethamphetamine (MDMA, or 'Ecstasy')". Neuropsychopharmacology 30 (3): 550–60. doi:10.1038/sj.npp.1300585. PMID 15496938. 
  5. ^ Robertson DW, Bloomquist W, Wong DT, Cohen ML (1992). "mCPP but not TFMPP is an antagonist at cardiac 5HT3 receptors". Life Sciences 50 (8): 599–605. doi:10.1016/0024-3205(92)90372-V. PMID 1736030. 
  6. ^ Partilla JS, Dempsey AG, Nagpal AS, Blough BE, Baumann MH, Rothman RB. Interaction of amphetamines and related compounds at the vesicular monoamine transporter. Journal of Pharmacology and Experimental Therapeutics. 2006 Oct;319(1):237-46.
  7. ^ Yarosh HL, Katz EB, Coop A, Fantegrossi WE. MDMA-like behavioral effects of N-substituted piperazines in the mouse. Pharmacology, Biochemistry and Behavior. 2007 Nov;88(1):18-27.
  8. ^ Wilkins C, Girling M, Sweetsur P, Huckle T, Huakau J. "Legal party pill use in New Zealand: Prevalence of use, availability, health harms and ‘gateway effects’ of benzylpiperazine (BZP) and triflourophenylmethylpiperazine (TFMPP)" (PDF). Centre for Social and Health Outcomes Research and Evaluation (SHORE). Retrieved 2007-04-14. 
  9. ^ Erowid TFMPP Vault : Legal Status
  10. ^ U.S. Department of Justice, Drug Enforcement Administration (DEA), Scheduling Actions 2002
  11. ^ Misuse of Drugs (Classification of BZP) Amendment Bill 2008

External links

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