Ondansetron 4mg (Mouth Dissolving) is a medication primarily used to prevent nausea and vomiting caused by chemotherapy, radiation therapy, or surgery. This formulation is designed to dissolve quickly in the mouth without the need for water, making it convenient for patients who may have difficulty swallowing tablets. Ondansetron works by blocking the action of serotonin, a chemical in the body that can trigger nausea and vomiting. It is fast-acting and typically administered in a single dose, but the exact dosage and duration depend on the patient’s specific condition and the treatment they are undergoing. The mouth-dissolving form ensures ease of use for patients, particularly those with swallowing difficulties.