An antiemetic is a drug that is effective against vomiting and nausea. Antiemetics are typically used to treat motion sickness and the side effects of opioid analgesics, general anaesthetics, and chemotherapy.
5-HT3 receptor antagonists block serotonin receptors in the central nervous system and gastrointestinal tract. Dolasetron, Granisetron, Ondansetron, Tropisetron, Palonosetron, Mirtazapine (antidepressant)
Dopamine antagonists act in the brain . Domperidone, Olanzapine, Droperidol, Haloperidol, Chlorpromazine, Prochlorperazine, Alizapride, Prochlorperazine, Metoclopramide.