Dantron 25 mL Syrup (Ondansetron) – Effective Antiemetic for Nausea & Vomiting in Pakistan Dantron 25 mL Syrup contains ondansetron (4 mg/5 mL), a potent antiemetic medication that helps prevent and treat nausea and vomiting caused by cytotoxic chemotherapy, radiation therapy, surgical procedures, and other medical conditions. Ondansetron works by blocking serotonin 5‑HT3 receptors in the central and peripheral nervous systems, interrupting the signals that trigger nausea and vomiting.This oral solution is especially useful for patients who cannot tolerate tablets, need rapid symptom relief, or are undergoing cancer treatment and need supportive therapy to reduce chemotherapy‑induced nausea. Use only as prescribed by a healthcare professional, and inform your doctor of any heart, liver, or medication interaction concerns.