Dolasetron is a medication primarily used to prevent nausea and vomiting caused by chemotherapy, radiation therapy, or surgery. It belongs to a class of drugs known as 5-HT3 receptor antagonists, which work by blocking the action of serotonin, a chemical in the body that can trigger nausea. Dolasetron is typically administered intravenously or orally, depending on the patient's needs. Common side effects may include headache, dizziness, and constipation. It is important for patients to discuss their medical history and any other medications they are taking with their healthcare provider before starting Dolasetron.