in illicit methamphetamine laboratories, but is usually an impurity rather than the desired product. It may be produced by accident when methamphetamine is synthesised by methylation of amphetamine if the reaction temperature is too high or an excess of methylating agent is used. Phenmetrazine Ethylamphetamine 4-Methyl-aminorex Methcathinone Cathinone Fenethylline Aminorex Benzylpiperazine