promethazine

 
Pronunciation: /prə(ʊ)ˈmɛθəziːn/

noun

[mass noun] Medicine
  • a synthetic antihistamine drug derived from phenothiazine, used chiefly to treat the symptoms of allergies and motion sickness.

Origin:

1950s: from pro(pyl) + (di)meth(ylamine), a colourless gas + (phenothi)azine