different between methamphetamine vs levomethamphetamine

English

From meth- +? amphetamine; 1945-50.

methamphetamine (plural methamphetamines)

A highly addictive phenethylamine stimulant drug, similar to cocaine. Its systematic (IUPAC) name is (S)-N-methyl-1-phenylpropan-2-amine.
Synonyms: crystal meth, ice, meth, methedrine, speed; see also Thesaurus:methamphetamine

levo- +? methamphetamine

levomethamphetamine (uncountable)

The levorotatory isomer of methamphetamine, a sympathomimetic vasoconstrictor used in some nasal decongestants.

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