ondansetron

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

Medical Definition of ondansetron 

: 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.

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oneirism

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