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Methamphetamine is available in two forms: "d" and "l." These compounds are stereoisomers (chemical mirror images). They have the same chemical formula and similar chemical properties. The "d" form is a prescription stimulant and appetite suppressant. The "l" form is available over-the-counter as the active ingredient of the Vick's inhaler and is a metabolite of certain prescription medications. Both "d" and "l" forms test positive by both immunoassay and most confirmation assays; a special d,l isomer confirmation test is available to determine how much of each form is present in a specimen.1