Methylpseudoephedrine (also known as (1S,2S)-(+)-N-Methylpseudoephedrine, N-Methylpseudoephedrine, N-Methylpseudoephedrine, its salts, optical isomers, and salts of optical isomers, 625-975-5, (+)-N-Methylpseudoephedrine, N-Methyl Pseudoephedrine, (1S,2S)-N-Methylephedrine, d-(1s,2s)-methylpseudoephedrine, (1S,2s)-n-methylpseudoephedrine or 2-(Dimethylamino)-1-phenyl-1-propanol #) is a sympathomimetic substance of the phenylethanolamine class.