Addiction Biology (December 2005) 10, 321  323
COMMENTARY
Methylone and mCPP, two new drugs of abuse?
M. G. BOSSONG, J. P. VAN DIJK & R. J. M. NIESINK
Drugs Information and Monitoring System (DIMS), Trimbos Institute for Mental Health and Addiction,
Utrecht, the Netherlands
Abstract
Recently, two new ecstasy-like substances, methylone and mCPP, were found in street drugs in the
Netherlands by the Drugs Information and Monitoring System (DIMS). Methylone (3,4-
methylenedioxymethcathinone) is the main ingredient of a new liquid designer drug that appeared
on the Dutch drug market, called  Explosion . mCPP (meta-chlorophenylpiperazine) is a substance
often used as a probe for the serotonin function in psychiatric research, and has now been found in street
drugs, both in tablets and powders. Methylone as well as mCPP act on monoaminergic systems,
resembling MDMA (3,4-methylenedioxymethamphetamine), with mCPP mainly affecting the
serotonin system. The subjective effects of both new substances exhibit subtle differences with those of
MDMA. Only little is known about the harmfulness of both methylone and mCPP. However, because
of similarities between these substances and MDMA, risks common to MDMA cannot be excluded.
Introduction
intended psychoactive effect. The text was probably put onto
Ever since ecstasy (XTC, MDMA) was classified as a
the label to circumvent Dutch regulations for illicit drugs and
Schedule I drug, people have been trying to find non- psychoactive substances.
scheduled alternatives with effects matching those of ecstasy.
Analyses of Explosion have demonstrated that the
Examples of such ecstasy-like designer drugs are 4-MTA
main ingredient of the liquid is the compound methylone
(Winstock et al., 2002), MBDB (Carter et al., 2000) and
(3,4-methylenedioxymethcathinone or 2-methylamino-1-(3,4-
MDEA (Freudenmann & Spitzer, 2004). Recently, two new
methylenedioxyphenyl)propan-1-one). 3,4-Methylenedioxy-
ecstasy-like substances, methylone and mCPP, were detected
methcathinone (MDMCAT or MDMC) is the benzylic
in street drugs in the Netherlands by the Drugs Information
ketone analogue of 3,4-methylenedioxymethamphetamine
and Monitoring System (DIMS). DIMS is a toxicoepidemio- (MDMA): it contains an additional oxygen atom at the
logic monitor of illegal drug markets. Its main focuses are to
benzylic position of the molecule (Figure 1) (Cozzi et al.,
identify the compounds of synthetic drugs, describe preva- 1999). 3,4-Methylenedioxymethcathinone was first synthe-
lence and trends, and identify health risks (Spruit, 2001).
sized by Alexander Shulgin. Because of the similarity
of effects between methamphetamine and its benzylic
ketone methcathinone, he examined whether there was a
3,4-Methylenedioxymethcathinone: methylone comparable connection between MDMA and its
At the end of 2004, a new designer drug called  Explosion benzylic analogue. He called the new substance methylone
appeared in the Netherlands. This new drug is sold as a liquid (Cognitiveliberty.org).
via the internet and in Dutch  smartshops , stores selling non- Methylone resembles MDMA in its behavioural profile, as
scheduled (herbal) psychoactive substances. The product is methylone substitutes for MDMA in rats trained to discrimi-
advertised as a  room odorizer and is sold in plastic tubes nate MDMA from saline. Methylone does not substitute for
containing 5 ml of liquid. The tubes cost betweene10 ande15 amphetamine or for the hallucinogenic DOM in animals
($13  $20) and do not present any information about the trained to discriminate between these drugs and saline (Dal
composition of Explosion; they contain only a label saying Cason et al., 1997). Further, also in common with MDMA,
 Room odorizer Vanilla. Do not ingest and  Keep away from methylone acts on monoaminergic systems. In vitro, methy-
children. Never use more than one bottle . In spite of this lone is threefold less potent than MDMA at inhibiting platelet
label, users mention that they ingest the liquid to reach the serotonin accumulation and as potent as MDMA in its
Correspondence to: Matthijs Bossong, MSc, Trimbos Institute for Mental Health and Addiction, PO Box 725, 3500 AS Utrecht,
The Netherlands. Tel:þ31 30 2971106; Fax:þ31 30 2971111; E-mail: mbossong@trimbos.nl
ISSN 1355-6215 print/ISSN 1369-1600 online/05/040321 03
ªSociety for the Study of Addiction to Alcohol and Other Drugs Taylor & Francis
DOI: 10.1080/13556210500350794
322 M. G. Bossong et al.
First, mCPP induces a release of serotonin (5-HT) dependent
on the serotonin transporter (SERT) (Pettibone & Williams,
1984; Baumann et al., 1993, 2001; Eriksson et al., 1999;
Gobbi et al., 2002). Secondly, mCPP possesses agonist
properties at some 5-HT receptors (e.g. 5-HT2C) and
antagonist properties at others (e.g. 5-HT2B) (Hamik &
Figure 1. Molecular structures of 3,4-methylenedioxymethamfetamine
Peroutka, 1989; Thomas et al., 1996; Gijsman et al., 2004).
(MDMA) (a) and methylone (b).
Concerning these effects on the serotonin system, mCPP is a
substance partially comparable with MDMA, as MDMA
releases 5-HT via a SERT-mediated process as well (e.g.
inhibiting effects on the dopamine and noradrenaline trans- Rudnick & Wall, 1992; for a review see Cole & Sumnall,
porters (Cozzi et al., 1999). 2003). As a consequence, the subjective effects of mCPP and
In spite of these behavioural and pharmacological simila- MDMA are also comparable, both positive as well as negative
rities between methylone and MDMA, the observed subjective (Tancer & Johanson, 2001, 2003). Examples of mild side
effects of both drugs of abuse are not completely identical effects mentioned after the use of mCPP are anxiety, dizziness
(Erowid.org). Shulgin wrote about the effects of this drug: and confusion (Gijsman et al., 1998; Tancer & Johanson,
 methylone has almost the same potency of MDMA, but it 2001, 2003; Feuchtl et al., 2004), whereas migraine and panic
does not produce the same effects. It has an almost attacks are observed frequently as severe negative effects
antidepressant action, pleasant and positive, but not the (Gijsman et al., 1998, 2004). Interestingly, MDMA-users
unique magic of MDMA (Cognitiveliberty.org). (McCann et al., 1999) and cocaine addicts (Buydens-
In the Netherlands, methylone is not yet scheduled as a Branchey et al., 1997) report a more positive response to
drug of abuse, but is considered to be a psychoactive mCPP than non-drug using volunteers.
medicine. Because methylone is not registered officially, as An important difference between mCPP and MDMA is the
such, it is forbidden to trade in methylone. The Minister of effect on the dopamine system: mCPP only exhibits minimal
Health has asked the Coordination point Assessment and effects on this system (Baumann et al., 2001; Gobbi et al.,
Monitoring new drugs group (CAM) to gather information 2002). Therefore, mCPP does not display any reinforcing
about this substance, resulting possibly in an official risk effects (Tancer & Johanson, 2003). Probably, in contrast with
assessment (van Amsterdam et al., 2004). Until now, no MDMA, heart rate, blood pressure and body temperature are
research has been conducted on the toxicity of methylone, so only mildly increased following the use of mCPP (Ghaziuddin
nothing is known about the harmfulness of this new drug. et al., 2003; Tancer & Johanson, 2003), while both mCPP and
MDMA cause a dose-dependent elevation of the hormones
ACTH, cortisol and prolactin (Kahn & Wetzler, 1991;
Meta-chlorophenylpiperazine: mCPP Gijsman et al., 1998; Ghaziuddin et al., 2003; Feuchtl et al.,
In September 2004, another ecstasy-like drug appeared on the 2004). Physiological and subjective effects reach their peak
Dutch drug market: meta-chlorophenylpiperazine (mCPP). after 1  2 hours after oral administration (Tancer & Johanson,
mCPP is a pharmacologically active metabolite of the 2001, 2003). The effects can last 4  8 hours (Gijsman et al.,
antidepressant drugs trazodone, nefazodone and etoperidone 1998; Tancer & Johanson, 2001, 2003).
and of the minor tranquillizer mepiprazole (Rotzinger et al., While MDMA is known to be a neurotoxic compound,
1998). Its chemical name is 1-(3-chlorophenyl)piperazine and mCPP lacks neurotoxic potential (Gobbi et al., 2002). mCPP
the chemical formula is C10H13ClN2 (Reynolds, 1996). is able to release 5-HT without causing a long-term depletion
From September 2004 until April 2005, DIMS registered of 5-HT (Ulrichsen et al., 1992; Baumann et al., 2001).
mCPP 25 times in drugs sold mainly as ecstasy, both in tablets Possibly, this difference between MDMA and mCPP can be
and powders. Two different kinds of tablets containing mCPP explained by the fact that mCPP releases only the cytoplas-
were found: a beige-coloured, round-shaped tablet and a matic 5-HT, while MDMA induces the release of both
white tablet with coloured flecks, both types without a logo. cytoplasmatic and vesicular 5-HT (Gobbi et al., 2002).
The dose of mCPP in the tablets ranged from 2 to 46 mg. In The doses of mCPP found in the street drugs analysed by
three cases, mCPP was discovered in a powder. Two powders DIMS (2  46 mg) are comparable with the doses used in
were sold as cocaine and one as speed, containing 7%, 8% and challenge tests of the serotonin system in psychiatry. In these
5% mCPP, respectively, the first-mentioned in combination tests, the commonly used oral dose of mCPP ranges from 0.1
with 1% cocaine-HCl. In addition to these identifications of to 0.75 mg/kg (7  52.5 mg mCPP for a 70-kg person) (Tancer
mCPP in the Netherlands, mCPP has also been detected in & Johanson, 2001, 2003; Gijsman et al., 2004). However,
several other European countries. Notifications of the detec- these are doses of individual tablets. When several tablets are
tion of mCPP were received from Sweden, France, Austria ingested, the clinically used dose can be exceeded. This might
and Lithuania, via the European Monitoring Centre for Drugs result in the serotonin syndrome (Klaassen et al., 1998).
and Drug Addiction (EMCDDA). Further, mCPP can be Therefore, the use of mCPP in combination with alcohol,
bought on the internet as X4, a tablet containing a ecstasy or antidepressant drugs should be avoided.
combination of four types of piperazines (mCPP, TFMPP, In contrast with methylone, mCPP is registered officially.
oMPP and pCPP) (Naturensdroger.nu; Modernatur.nu). Consequently, only licensed traders are allowed to sell this
mCPP is the most extensively used probe of serotonin substance. Because mCPP has appeared on the illegal drug
function in psychiatric research (Kahn & Wetzler, 1991). It has market, it might become subject to an official risk assessment
both pre- and postsynaptic effects on the serotonin system. by the CAM.
New drugs of abuse 323
Gijsman HJ, Van Gerven JM, Tieleman MC, Schoemaker RC, Pieters
Until now, little has been known about the use and use
MS, Ferrari MD, Cohen AF, Van Kempen GM (1998)
patterns of methylone and mCPP. Monitoring and specific
Pharmacokinetic and pharmacodynamic profile of oral and
epidemiological research among high-risk users could gain an
intravenous meta-chlorophenylpiperazine in healthy volunteers.
insight into risks associated with the use of these drugs alone
J Clin Psychopharmacol 18:289  295.
Gobbi M, Moia M, Pirona L, Ceglia I, Reyes-Parada M, Scorza C,
or in combination with other drugs.
Mennini T (2002) p-Methylthioamphetamine and 1-(m-chloro-
The abuse of methylone and mCPP have not yet been
phenyl)piperazine, two non-neurotoxic 5-HT releasers in vivo,
reported to be associated with fatal or non-fatal intoxication.
differ from neurotoxic amphetamine derivatives in their mode of
However, both substances carry potential risks common to
action at 5-HT nerve endings in vitro. J Neurochem 82:1435 
MDMA and 4-MTA. Therefore, a risk of acute or chronic 1443.
Hamik A, Peroutka SJ (1989) 1-(m-chlorophenyl)piperazine (mCPP)
toxicity cannot be excluded.
interactions with neurotransmitter receptors in the human brain.
Biol Psychiatry 25:569  575.
Kahn RS, Wetzler S (1991) m-Chlorophenylpiperazine as a probe of
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