Para-Hydroxynorephedrine (also known as (-)-4-Hydroxynorephedrin, Norephedrine, p-hydroxy-, (-)-P-hydroxynorephedrine, Benzenemethanol, α-(1-aminoethyl)-4-hydroxy-, (R-(R,S))-**, (1R,2S)-2-Amino-1-(4-hydroxyphenyl)propan-1-ol, para-Hydroxynorephedrine, Benzyl alcohol, .α.-(1-aminoethyl)-p-hydroxy-, (-)-erythro-, Benzenemethanol, α-((1s)-1-aminoethyl)-4-hydroxy-, (αr)-, p Hydroxynorephedrine or Hydroxynorephedrine, p) is a sympathomimetic substance of the phenylethanolamine class.