antiemetic

n. drug used to alleviate or prevent nausea and vomiting (Medicine)

adj. serving to alleviate or prevent nausea and vomiting (Medicine)

An anti-emetic is a drug that is effective against vomiting and nausea. Anti-emetics are typically used to treat motion sickness and the side effects of opioid analgesics, general anaesthetics and chemotherapy directed against cancer.
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Antiemetic /an·ti·emet·ic/ preventing or alleviating nausea and vomiting; also, an agent that so acts. an·ti·e·met·ic adj. [more]Antiemetic - Community and Resources

Noun
1. a drug that prevents or alleviates nausea and vomiting
(synonym) antiemetic drug
(hypernym) medicine, medication, medicament, medicinal drug
(hyponym) dimenhydrinate, Dramamine

(a. / n.)
Same as Antemetic.