ONCOPEN 4MG (Ondansetron Orally Disintegrating Tablets 4mg) is designed to provide swift relief from nausea and vomiting caused by chemotherapy, radiation therapy, and surgery. The active ingredient, Ondansetron, is a selective 5-HT3 receptor antagonist that blocks the action of serotonin, a natural substance that can cause nausea and vomiting. These tablets dissolve quickly on the tongue, making them ideal for patients who have difficulty swallowing pills or are experiencing nausea.