Methamphetamine is a psychostimulant drug of the phenethylamine and amphetamine classes known by the street names "meth," "ice," and "glass". This internal standard is suitable for quantitation of methamphetamine levels in urine, serum, or plasma by LC/MS or GC/MS for urine drug testing, clinical toxicology, sports testing, forensic analysis, or isotope dilution methods. The dextrorotatory isomer of methamphetamine is a pharmaceutical drug sold under the trade name Desoxyn? for treatment of ADHD and obesity.