R(-)-Methamphetamine, or levomethamphetamine, is a vasoconstrictor and component of multiple over-the-counter nasal decongestants. This certified Snap-N-Spike? solution is suitable for use as starting material in calibrators or controls for a variety of LC/MS or GC/MS applications such as forensic analysis, sports testing, clinical toxicology, or urine drug testing. R(-)-Methamphetamine belongs to the amphetamine and phenethylamine classes of drugs.