Systematic (IUPAC) name
Clinical data
Legal status
Routes Oral, insufflation, IV, rectal,[2] smoking[3]
CAS number  N
1189726-22-4 (HCl)[1]:5
ATC code None
ChemSpider  YesY
Synonyms 4-methyl-N-methylcathinone; 2-methylamino-1-p-tolylpropan-1-one[4]
Chemical data
Formula C11H15NO 
Mol. mass 177.242 g/mol

Mephedrone, also known as 4-synthetic stimulant drug of the amphetamine and cathinone classes. Slang names include drone,[5] M-CAT,[6] and meow meow.[7] It is chemically similar to the cathinone compounds found in the khat plant of eastern Africa. It comes in the form of tablets or a powder, which users can swallow, snort or inject, producing similar effects to MDMA, amphetamines and cocaine.

In addition to its stimulant effects, mephedrone produces side effects, of which teeth grinding is the most common. The metabolism of mephedrone has been studied in rats and humans and the metabolites can be detected in urine after usage. Despite similarities to known neurotoxins such as methamphetamine and cathinone derivatives, mephedrone does not appear to produce neurotoxic effects in the dopamine system of mice.[8]

Mephedrone was first synthesised in 1929, but did not become widely known until it was rediscovered in 2003. By 2007, mephedrone was reported to be available for sale on the internet, by 2008 law enforcement agencies had become aware of the compound, and by 2010, it had been reported in most of Europe, becoming particularly prevalent in the United Kingdom. Mephedrone was first made illegal in Israel in 2008, followed by Sweden later that year. In 2010, it was made illegal in many European countries and in December 2010, the EU ruled it illegal. In Australia, New Zealand and the USA, it is considered an analog of other illegal drugs and can be controlled by laws similar to the Federal Analog Act. In September 2011, the USA temporarily classified mephedrone as illegal, in effect from October 2011.


  • History 1
    • In the UK 1.1
  • Effects 2
    • Intended effects 2.1
    • Side effects 2.2
    • Long-term effects 2.3
  • Typical use and consumption 3
    • Harm reduction 3.1
  • Pharmacology 4
    • Metabolism 4.1
    • Toxicity 4.2
    • Detection in biological specimens 4.3
    • Deaths 4.4
      • Sweden 4.4.1
      • UK 4.4.2
      • USA 4.4.3
  • Chemistry 5
    • Appearance 5.1
    • Synthesis 5.2
      • Purity 5.2.1
  • Legal status 6
  • See also 7
  • References 8
  • External links 9


Mephedrone is one of hundreds of designer drugs or legal highs that have been reported in recent years, including artificial chemicals such as synthetic cannabis and semisynthetic substances such as methylhexanamine. These drugs are primarily developed to avoid being controlled by laws against illegal drugs, thus giving them the label of designer drugs.[9] According to the European Monitoring Centre for Drugs and Drug Addiction, the synthesis of mephedrone was first reported in 1929 by Saem de Burnaga Sanchez in the Bulletin de la Société Chimique de France, under the name "toluyl-alpha-monomethylaminoethylcetone",[1]:17[10] but the compound remained an obscure product of academia until 2003, when it was "re-discovered" and publicised by an underground chemist on The Hive website, working under the pseudonym "Kinetic".[11] Kinetic posted on the site, "I’ve been bored over the last couple of days and had a few fun reagents lying around, so I thought I’d try and make some 1-(4-methylphenyl)-2-methylaminopropanone hydrochloride, or 4-methylmethcathinone." before going on to describe that after taking it, the user had a "fantastic sense of well-being that I haven’t got from any drug before except my beloved Ecstasy."[12] In interviews Kinetic was described as "a mathematician who used to design sleeping pills for a major pharmaceutical company" and he stated that he was based in Israel when he rediscovered mephedrone.[13][14]

A drug similar to mephedrone, containing

  • European Monitoring Center for Drugs and Drug Addiction (2011). Report on the risk assessment of mephedrone in the framework of the Council Decision on new psychoactive substances (Report).
  • Erowid 4-Methylmethcathinone Vault
  • Mephedrone – Frequently asked questions
  • Guardian Daily Podcast: How dangerous is mephedrone?
  • ChemSub Online: Mephedrone

External links

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  2. ^ a b c d e Winstock, A.; Mitcheson, L.; Deluca, P.; Davey, Z.; Corazza, O.; Schifano, F. (2010). "Mephedrone, new kid for the chop?". Addiction 106 (1): 154–61.  (subscription required)
  3. ^ a b c Matthews, A.; Bruno, R. (2010). "Mephedrone use among regular ecstasy consumers in Australia". Ecstasy and related drug trends bulletin. Archived from the original on 2011-02-18. 
  4. ^ Meyer; Peters, M; Maurer, H. (2009). "Metabolism of the new designer drug mephedrone and toxicological detection of the beta keto designer drugs mephedrone, butylone and methylone in urine" (PDF). Annales de Toxicologie Analytique 21 (S1): 22. 
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  6. ^ "Drugs crackdown hailed a success". BBC News. 8 March 2010. Retrieved 2010-03-31. 
  7. ^ Schifano, F.; Albanese, A.; Fergus, S.; Stair, J. L.; Deluca, P.; Corazza, O.; Davey, Z.; Corkery, J.; Siemann, H.; Scherbaum, N.; Farre', M.; Torrens, M.; Demetrovics, Z.; Ghodse, A. H.; Psychonaut Web, M.; Rednet Research, G. (2010). "Mephedrone (4-methylmethcathinone; 'meow meow'): chemical, pharmacological and clinical issues". Psychopharmacology 214 (3): 593–602.  
  8. ^ Angoa-Pérez M, Kane MJ, Francescutti DM et al. (March 2012). "Mephedrone, an abused psychoactive component of 'bath salts' and methamphetamine congener, does not cause neurotoxicity to dopamine nerve endings of the striatum". Journal of Neurochemistry 120 (6): 1097–107.  
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See also

In some countries, mephedrone is not specifically listed as illegal, but is controlled under legislation that makes compounds illegal if they are analogs of drugs already listed. In Australia during 2010, it was not specifically listed as prohibited,[18] but the Australian Federal Police stated it is an analogue to methcathinone and therefore illegal. In February 2010, 22 men were arrested in connection with importing mephedrone.[157] By January 2011, every state in Australia, other than Victoria, had listed it as a controlled drug.[158] In New Zealand, it is not included in the Misuse of Drugs Act 1975,[159] but is illegal, as it is similar to controlled substances.[160] In Canada, mephedrone is not explicitly listed in any schedule of the Controlled Drugs and Substances Act, but "amphetamines, their salts, derivatives, isomers and analogues and salts of derivatives, isomers and analogues" are included in Section 19 of Schedule I of the act. Cathinone and methcathinone are listed in separate sections of Schedule III, while diethylpropion and pyrovalerone (also cathinones), are listed in separate sections of Schedule IV, each without language to capture analogues, isomers, etc.[161] Mephedrone is considered a controlled substance by Health Canada.[162] According to the Canadian Medical Association, mephedrone is grouped with other amphetamines as Schedule I controlled substances.[163] There have been several media reports of the Canadian police seizing mephedrone.[164][165][166] Mephedrone is also currently scheduled in the United States as of 2011. The Drug Enforcement Administration (DEA) states, as an analogue of methcathinone, possession of mephedrone can be controlled by the Federal Analog Act, but according to the Los Angeles Times, this only applies if it is sold for human consumption.[167][168][169] Several cities and states, such as New York,[170] have passed legislation to specifically list mephedrone as illegal, but in most areas it was legal, so long as it is not sold for human consumption, so retailers described it as 'bath salts'.[169] In September 2011, The DEA began using its emergency scheduling authority to temporarily control mephedrone. Except as authorized by law, this action made possessing and selling mephedrone or the products that contain it illegal in the USA for at least one year while the DEA and the United States Department of Health and Human Services conduct further study.[171] Control of these compounds became permanent on 9 July 2012, via passage of the Synthetic Drug Abuse Prevention Act of 2012.[172]

In 2010, as its use became more prevalent, many countries passed legislation prohibiting mephedrone. It became illegal in Croatia[126] and Germany[127] in January, followed by Romania[128] and the Isle of Man in February.[129] In March 2010, it was classified as an unregulated medicine in the Netherlands, making the sale and distribution of it illegal.[130][131] The importation of mephedrone into the UK was banned on 29 March 2010.[132] The next day, the ACMD in the UK published a report on the cathinones, including mephedrone, and recommended they be classified as Class B drugs. On 7 April 2010, the Misuse of Drugs Act 1971 (Amendment) Order 2010 was passed by parliament, making mephedrone and other substituted cathinones, Class B drugs from 16 April 2010.[133][134] Prior to the ban taking effect, mephedrone was not covered by the Misuse of Drugs Act 1971.[26] It was, though, an offence under the Medicines Act to sell it for human consumption, so it was often sold as "plant food" or "bath salts", although it has no use as these products; this, too, was possibly illegal under the Trade Descriptions Act 1968.[52][82][83] In the USA, similar descriptions have been used to describe mephedrone, as well as methylenedioxypyrovalerone (MDPV).[135] In May 2010, the Republic of Ireland made mephedrone illegal,[136][137][138] followed by Belgium,[139] Italy,[140] Lithuania,[141] France[142][143] and Norway[144] in June and Russia in July.[145] In August 2010, Austria[146] and Poland[147] made it illegal and China announced it would be illegal as of 1 September 2010.[27] Mephedrone had been reported to be used in Singapore in February 2010,[148] but it was made illegal in November 2010.[149] In December 2010, following the advice of the EMCDDA, mephedrone was made illegal throughout the EU, a move Switzerland also made shortly afterwards.[150][151] Countries which have not already banned it, such as the Netherlands, Greece and Portugal, will need to change legislation to comply with the EU ruling.[151] In Hungary, a government advisory body recommended mephedrone should be made illegal in August 2010, which was followed, making it illegal in January 2011;[152][153] Spain followed in February 2011.[154] Mexico, by Decree,[155] outlawed mephedrone as a substance "with low or no therapeutical use which pose a serious threat to public health"[156] in 2014.

When mephedrone was rediscovered in 2003, it was not specifically illegal to possess in any country. As its use has increased, many countries have passed legislation making its possession, sale, and manufacture illegal. It was first made illegal in Israel, where it had been found in products such as Neodoves pills, in January 2008.[5] After the death of a young woman in Sweden in December 2008 was linked to the use of mephedrone, it was classified as a hazardous substance a few days later, making it illegal to sell in Sweden. In June 2009, it was classified as a narcotic with the possession of 15 grams or more resulting in a minimum of two years in prison – a longer sentence, gram for gram than given for the possession of cocaine or heroin.[118][119] In December 2008, Denmark also made it illegal[120] and through the Medicines Act of Finland, it was made illegal to possess without a prescription.[121] In November 2009, it was classified as a "narcotic or psychotropic" substance and added to the list of controlled substances in Estonia[122] and made illegal to import into Guernsey along with other legal highs,[123] before being classified as a Class B drug in April 2010.[124] It was classified as a Class C drug in Jersey in December 2009.[125]

A sample of mephedrone that was confiscated in Oregon, USA, 2009

Legal status

One published study that analysed samples of mephedrone bought using the internet in the UK in 2010 found it was racemic (a mixture of both stereoisomers) and of high purity.[92] An unpublished study of six samples also ordered off the internet in the UK in 2010 found they contained very few organic impurities.[116] Four products sold in Irish head shops were tested in 2010 and were found to contain between 82% and 14% mephedrone, with some products containing benzocaine and caffeine.[117]


A stereospecific form of (S)-mephedrone could be prepared via Friedel–Crafts acylation. The first step in the synthesis would be to react toluene and (S)-N-trifluoroacetylalanoyl chloride in the presence of aluminium chloride, then deprotect the intermediate with hydrochloric acid-propyl alcohol. This would produce (S)-4-methylcathinone, which could then be methylated to produce mephedrone.[90][115]

It can also be produced by oxidising the ephedrine analogue 4-methylephedrine using potassium permanganate dissolved in sulfuric acid. Because 4-methylephedrine can be obtained in a specific enantiomeric form, mephedrone consisting of only one enantiomer can be produced. The danger associated with this method is it may cause manganese poisoning if the product is not correctly purified.[1]:17

Mephedrone synthesis scheme from 4-methylpropiophenone

Mephedrone can be synthesised in several ways. The simplest method, due to the availability of the compounds,[1]:17 is to add 4-methylpropiophenone dissolved in glacial acetic acid to bromine, creating an oil fraction of 4'-methyl-2-bromopropiophenone. The oil fraction can then be dissolved in dichloromethane (CH2Cl2) and drops of the solution added to another solution of CH2Cl2-containing methylamine hydrochloride and triethylamine. Hydrochloric acid (HCl) is then added and the aqueous layer is removed and turned alkaline using sodium hydroxide before the amine is extracted using CH2Cl2. The CH2Cl2 is then evaporated using a vacuum, creating an oil which is then dissolved in a nonaqueous ether. Finally, HCl gas is bubbled through the mixture to produce 4-methylmethcathinone hydrochloride.[18] This method produces a mixture of both enantiomers and requires similar knowledge to that required to synthesise amphetamines and MDMA.[1]:17


Mephedrone is a white substance. It is sold most commonly as crystals or a powder, but also in the form of capsules or pills.[21][94] It can have a distinctive odour, reported to range from a synthetic fishy smell[113] to the smell of vanilla and bleach, stale urine, or electric circuit boards.[114]



Mephedrone has been implicated in the death of a 22-year-old male, who had also injected black tar heroin. Mephedrone was found in his blood at a concentration of 0.50 mg/l and in his urine at a concentration of 198 mg/l. The blood concentration of morphine, a metabolite of heroin, was 0.06 mg/l.[111] For comparison, the average blood morphine concentration resulting from deadly overdoses involving only heroin is around 0.34 mg/l.[112]


In 2010, unconfirmed reports speculated about the role mephedrone has played in the deaths of several young people in the UK. By July 2010, mephedrone had been alleged to be involved in 52 fatalities in the UK, but detected in only 38 of these cases. Of the nine that coroners had finished investigating, two were caused directly by mephedrone.[106] The first death reported to be caused by mephedrone use was that of 46-year-old, John Sterling Smith,[107] who had underlying health problems and repeatedly injected the drug.[108] A report in Forensic Science International in August 2010 stated mephedrone intoxication has been recorded as the cause of death in two cases in Scotland. Post mortem samples showed the concentration of mephedrone in their blood was 22 mg/l in one case and 3.3 mg/l in the other.[109] The death of a teenager in the UK in November 2009 was widely reported as being caused by mephedrone, but a report by the coroner concluded she had died from natural causes.[46] In March 2010, the deaths of two teenagers in Scunthorpe were widely reported by the media to be caused by mephedrone. Toxicology reports showed the teenagers had not taken any mephedrone and had died as a result of consuming alcohol and the heroin substitute methadone.[108][110] According to Fiona Measham, a criminologist who is a member of the ACMD, the reporting of the unconfirmed deaths by newspapers followed "the usual cycle of ‘exaggeration, distortion, inaccuracy and sensationalism'" associated with the reporting of recreational drug use.[34]


In 2008, an 18-year-old Swedish woman died in Stockholm after taking mephedrone. The newspaper Svenska Dagbladet reported the woman went into convulsions and turned blue in the face.[104] Doctors reported she was comatose and suffering from hyponatremia and severe hypokalemia; the woman died one and a half days after the onset of symptoms. An autopsy showed severe brain swelling.[105] Mephedrone was scheduled to be classified as a "dangerous substance" in Sweden even before the woman's death at Karolinska University Hospital on 14 December, but the death brought more media attention to the drug. The possession of mephedrone became classified as a criminal offence in Sweden on 15 December 2008.[104]



Mephedrone may be quantitated in blood, plasma or urine by gas chromatography-mass spectrometry to confirm a diagnosis of poisoning in hospitalized patients or to provide evidence in a medicolegal death investigation. Blood or plasma mephedrone concentrations are expected to be in a range of 50–100 μg/l in persons using the drug recreationally, >100 μg/l in intoxicated patients and >500 μg/l in victims of acute overdosage.[103]

Detection in biological specimens

As of March 2010, no studies on the potential neurotoxicity of mephedrone have been reported,[81] nor is the median lethal dose known.[2] In 2009, one case of sympathomimetic toxicity was reported in the UK after a person took 0.2 g of mephedrone orally, and after this did not achieve the desired effect, subcutaneously injected 3.8 g mixed with water into his thighs. Shortly afterwards, the user "developed palpitations, blurred tunnel vision, chest pressure and sweating". The patient was treated with 1 mg of lorazepam and the sympathomimetic features decreased and the user was discharged within six hours of arrival.[98] One case of serotonin syndrome has been reported, where the patient was already prescribed fluoxetine and olanzapine, and then took 40 tablets containing mephedrone in one night. He was treated with lorazepam and discharged 15 hours after admission.[99] Both enantiomers of methcathinone, which differs only in the lack of the methyl group on the aryl ring when compared to mephedrone, have been shown to be toxic to rat dopamine neurons, and the S-enantiomer was also toxic against serotonin neurons. Simon Gibbons and Mire Zloh of the School of Pharmacy, University of London stated, based on the chemical similarities between methcathinone and mephedrone, "it is highly likely that mephedrone will display neurotoxicity".[92] However, Brunt and colleagues stated, "extreme caution" should be used when inferring the toxicity of mephedrone from methcathinone, noting some of the toxicity associated with methcathinone is due to manganese impurities related to its synthesis, rather than the compound itself. They concluded more experimental research is needed to investigate the toxicity of mephedrone.[38] Doctors who treated a 15-year-old female suffering from mephedrone intoxication suggested in The Lancet that, like MDMA, mephedrone may promote serotonin-mediated release of antidiuretic hormone, resulting in hyponatraemia and an altered mental state.[100] In another case, a 19-year-old male was admitted to hospital suffering from inflammation of the heart, 20 hours after taking one gram of mephedrone. The doctors treating the patient stated it was caused by either a direct toxic effect of mephedrone on the heart muscle, or by an immune response.[101] One case of acquired methaemoglobinaemia, where a patient had "bluish lips and fingers", has also been reported, after the user snorted one gram of mephedrone. The patient started to recover after arriving at the hospital and it was not necessary to administer any medication.[102]


Proposed scheme for the metabolism of mephedrone (1) based on the analysis of rat and human urine[97]

Based on the analysis of rat and human urine by gas chromatography and mass spectrometry, mephedrone is thought to be metabolised by three phase 1 pathways. It can be demethylated to the primary amine (producing compounds 2, 3 and 5), the ketone group can be reduced (producing 3) or the tolyl group can be oxidised (producing 6). Both 5 and 6 are thought to be further metabolised by conjugation to the glucuronide and sulfate derivatives. Knowledge of the primary routes of metabolism should allow the intake of mephedrone to be confirmed by drug tests, as well as more accurate determination of the causes of side effects and potential for toxicity.[97]


Several articles published near the end of 2011 examined the effects of mephedrone, compared to the similar drugs MDMA and amphetamine in the nucleus accumbens of rats, as well as examining the reinforcing potential of mephedrone. Dopamine and serotonin were collected using microdialysis, and increases in dopamine and serotonin were measured using HPLC. Reward and drug seeking are linked to increases in dopamine concentrations in the nucleus accumbens, and drug half-life plays a role in drug seeking, as well. Based on histological examination, most of the author's probes were in the nucleus accumbens shell. Mephedrone administration caused about a 500% increase in dopamine, and about a 950% increase in serotonin. They reached their peak concentrations at 40 minutes and 20 minutes, respectively, and returned to baseline by 120 minutes after injection. In comparison, MDMA caused a roughly 900% increase in serotonin at 40 minutes, with an insignificant increase in dopamine. Amphetamine administration resulted in about a 400% increase in dopamine, peaking at 40 minutes, with an insignificant increase in serotonin. Analysis of the ratio of the AUC for dopamine (DA) and serotonin (5-HT) indicated mephedrone was preferentially a serotonin releaser, with a ratio of 1.22:1 (serotonin vs. dopamine). Additionally, half-lives for the decrease in DA and 5-HT were calculated for each drug. Mephedrone had decay rates of 24.5 minutes and 25.5 minutes, respectively. MDMA had decay values of 302.5 minutes and 47.9 minutes, respectively, while amphetamine values were 51 minutes and 84.1 minutes, respectively. Taken together, these findings show mephedrone induces a massive increase in both DA and 5-HT, combined with rapid clearance. The rapid rise and subsequent fall of DA levels could explain some of the addictive properties mephedrone displays in some users.[95][96]

The pharmacology and toxicology of mephedrone had not been studied in detail until well after its sale as a designer drug and its addition to controlled drug lists in many countries.[90][91] Writing in the British Medical Journal, psychiatrists stated, given its chemical structure, "mephedrone is likely to stimulate the release of, and then inhibit the reuptake of monoamine neurotransmitters".[81] The cathinone derivatives methcathinone and methylone act in a similar way to amphetamines, mainly acting on catecholamine transporters, so mephedrone is expected also to act in this way. The actions of amphetamines and cathinones are determined by the differences in how they bind to noradrenalin, dopamine and serotonin transporters.[90] Molecular modelling of mephedrone suggests it is more hydrophilic than methyl-amphetamines, which may account for the higher doses required to achieve a similar effect, because mephedrone is less able to cross the blood–brain barrier.[1]:12[92] Mephedrone has a chiral centre, so exists in two forms, called enantiomers; the S form is thought to be more potent than the R form, because this applies to cathinone.[90] Professor David Nutt, former chair of the Advisory Council on the Misuse of Drugs (ACMD) in the UK has said, "people are better off taking ecstasy or amphetamines than those [drugs] we know nothing about" and "Who knows what's in [mephedrone] when you buy it? We don't have a testing system. It could be very dangerous, we just don't know. These chemicals have never been put into animals, let alone humans."[93] Les King, a former member of the ACMD, has stated mephedrone appears to be less potent than amphetamine and ecstasy, but that any benefit associated with this could be negated by users taking larger amounts. He also told the BBC, "all we can say is [mephedrone] is probably as harmful as ecstasy and amphetamines and wait until we have some better scientific evidence to support that."[94]

The two enantiomers of mephedrone: The potentially more potent S form is above the R form


The drugs advice charity Lifeline recommends that to reduce the potential harm caused by using mephedrone, users should only use mephedrone occasionally (less than weekly), use less than 0.5 g per session, dose orally rather than snorting the drug, and avoid mixing it with alcohol and other drugs. Users should also drink plenty of water at sensible intervals while taking the drug, as it causes dehydration.[89]

Harm reduction

Mephedrone can come in the form of capsules, tablets or white powder that users may swallow, snort, inject, smoke or use rectally.[1]:12[2][3] It is sometimes sold mixed with methylone in a product called bubbles in the UK[86] and also mixed with other cathinones, including ethcathinone, butylone, fluoromethcathinone and methedrone.[1]:9 The Guardian reported some users compulsively redose, consuming their whole supply when they only meant to use a small dose,[87] and there have been other similar reports of users craving mephedrone, suggesting it may be addictive.[1]:13[38] A survey conducted in late 2009 by the National Addiction Centre (UK) found 41.3% of readers of Mixmag had used mephedrone in the last month, making it the fourth most popular drug amongst clubbers. Of those, two-thirds snorted the drug and the average dosage per session was 0.9 g; the length of sessions increased as the dosage increased. Users who snorted the drug reported using more per session than those who took it orally (0.97 g compared to 0.74 g) and also reported using it more often (five days per month compared to three days per month).[2] An Irish study of people on a methadone treatment program for heroin addicts found 29 of 209 patients tested positive for mephedrone usage.[88] A study of users in Northern Ireland found they did not equate the fact that mephedrone was legal with it being safe to use. This was contrary to another study in New Zealand, where users of benzylpiperazine thought that because it was legal, it was safe.[9]

Typical use and consumption

Almost nothing is known about the long-term effects of the drug due to the short history of its use.[83] BBC News reported one person who used the drug for 18 months became dependent on the drug, in the end using it twice a week, and had to be admitted to a psychiatric unit after he started experiencing hallucinations, agitation, excitability and mania.[1]:13[85]

Long-term effects

The ECMDDA reported mephedrone can cause various unintended side effects including: dilated pupils,[81] poor concentration, teeth grinding, problems focusing visually, poor short-term memory, hallucinations, delusions, and erratic behaviour.[1]:13 They noted the most severe effects appear anecdotally to be linked with high doses or prolonged usage, and the effects may be due to users taking other intoxicants at the same time. Other effects users in internet forums have noted include changes in body temperature, increased heart rate, breathing difficulties, loss of appetite, increased sweating, discolouration of extremities, anxiety, paranoia and depression.[1]:13 When snorted, it can also cause nose bleeds and nose burns.[1]:13[82] A survey conducted by the National Addiction Centre, UK, found 67% of mephedrone users experienced sweating, 51% suffered from headaches, 43% from heart palpitations, 27% from nausea and 15% from cold or blue fingers,[83] indicative of vasoconstriction occurring.[41] Doctors at Guy's Hospital, London reported, of 15 patients they treated after taking mephedrone in 2009, 53% were agitated, 40% had increased heart rates, 20% had systolic hypertension and 20% had seizures; three required treatment with benzodiazepines, predominantly to control their agitation. They reported none of their patients suffered from cold or blue peripheries, contrary to other reports. Nine of the 15 of patients had a