PROMETHAZINE By N., Pam M.S. - April 28, 2013 Also known by its U.S. trade name, Phenegran. Promethazine is a neuroleptic and antihistamine. It is used to treat nausea, motion sickness and in allergies. PROMETHAZINE: "Whenever spring came around, Tim knew he would be needing Promethazine." Related Psychology Terms MOTION SICKNESS AIR SICKNESS SINEMET DIMENHYDRINATE SPACE ADAPTATION SYNDROME SEASICKNESS PHENERGAN PROVIGIL CARBONIC ANHYDRASE INHIBITORS ROBAXIN Cite this page: N., Pam M.S., "PROMETHAZINE," in PsychologyDictionary.org, April 28, 2013, https://psychologydictionary.org/promethazine/ (accessed September 25, 2020).