For which condition is ondansetron prescribed?

A. Vomiting: Ondansetron is a selective serotonin 5-HT3 receptor antagonist that blocks serotonin in the chemoreceptor trigger zone and gastrointestinal tract. It is primarily prescribed to prevent or treat nausea and vomiting caused by chemotherapy, radiation, or surgery. B. Chronic pain: Ondansetron does not have analgesic properties and is not used to manage pain. Pain management requires opioids, NSAIDs, or adjuvant medications depending on etiology. C. Headaches: While ondansetron might be used to treat the nausea that comes with a migraine, it does not treat the headache itself. Ondansetron does not relieve headache or migraine symptoms. Headache treatment involves analgesics, triptans, or preventive therapies, not antiemetics like ondansetron. D. Type 2 diabetes: Ondansetron does not affect insulin secretion, glucose metabolism, or glycemic control. This is managed with insulin or oral hypoglycemics (like Metformin) to control blood sugar.