Sumatriptan is a medication primarily used to treat migraine headaches. It belongs to a class of drugs known as triptans, which work by narrowing blood vessels in the brain and reducing inflammation. This helps alleviate the symptoms of a migraine, such as pain, nausea, and sensitivity to light and sound. Sumatriptan is available in various forms, including tablets, nasal sprays, and injections. It is typically taken at the onset of a migraine attack for the best results. While effective for many, it may not be suitable for everyone, and potential side effects can include dizziness, drowsiness, and nausea.