SANCUSO is a prescription medication designed to prevent nausea and vomiting in patients undergoing chemotherapy. It comes in the form of a transdermal patch that is applied to the skin, offering a convenient and non-invasive option for those who may have difficulty swallowing pills or keeping oral medications down due to nausea. The active ingredient in SANCUSO is granisetron, a type of drug known as a serotonin-3 (5-HT3) receptor antagonist. It works by blocking the action of serotonin, a natural substance in the body that can cause vomiting. By doing so, SANCUSO effectively helps manage and prevent the onset of chemotherapy-induced nausea and vomiting over several days with a single application, providing continuous relief and improving the quality of life for patients undergoing cancer treatment.