Wiktionary
levomethamphetamine
n. The levorotatory isomer of methamphetamine, a sympathomimetic vasoconstrictor used in some nasal decongestants.
Wikipedia
Levomethamphetamine
Levomethamphetamine is the levorotary (L- enantiomer) form of methamphetamine. Levomethamphetamine is a sympathomimetic vasoconstrictor which is the active ingredient in some over-the-counter (OTC) nasal decongestant inhalers in the United States.