ondansetron

noun

on·​dan·​se·​tron än-ˈdän-si-ˌträn, ōn- 

: an antiemetic drug administered orally or parenterally in the form of its hydrated hydrochloride C₁₈H₁₉N₃O·HCl·2H₂O to prevent nausea and vomiting occurring especially as a consequence of cancer chemotherapy or surgery

Note: Odansetron is marketed under the trademark Zofran.