Antiemetics are used to treat nausea and vomiting caused by several conditions, including motion sickness, chemotherapy, and vertigo. Antiemetics work by blocking certain signals in your brain that trigger nausea and vomiting. These medications come in different forms, including oral pills and injections. Examples include meclizine (Antivert, Bonine, Dramamine Less Drowsy), trimethobenzamide (Tigan), and amisulpride (Barhemsys).