1. Emicet (ondansetron) is an anti-nausea and vomiting medicine used to treat nausea and vomiting caused by chemotherapy, radiation therapy, and some surgeries. 2. The active ingredient in EMESET (ONDANSETRON) is ondansetron, which is a serotonin 5-HT3 receptor antagonist. 3. EMESET (ONDANSETRON) is available as tablets, liquid tablets, or orally disintegrating tablets. . Common side effects of EMESET (ONDANSETRON) include headache, Constipation and diarrhea. 5.EMESET (ONDANSETRON) can be purchased online from our website.