Naratriptan hydrochloride is primarily used in the treatment of migraine headaches. It works by narrowing the blood vessels around the brain and reducing substances in the body that can trigger headache pain, nausea, sensitivity to light, and other migraine symptoms. This medication is specifically effective for patients who experience moderate to severe migraine attacks and is often prescribed when other treatments have not provided sufficient relief. It is typically taken orally as soon as migraine symptoms begin, and its use is generally limited to managing acute episodes rather than preventing migraines. Patients are advised to follow their healthcare provider's instructions carefully to avoid potential side effects or overuse.