Sumatriptan is a prescription medication used to treat migraine headaches once they have started. Sumatriptan belongs to a group of drugs called serotonin receptor agonists or "triptans", which relieve pain by narrowing blood vessels around the brain.

This medication comes in tablet, nasal spray, and injectable forms and is taken at the first sign of a migraine headache.

Common side effects of sumatriptan include tingling or numbness in fingers or toes, weakness, tiredness. Sumatriptan can cause drowsiness. Do not drive a car or operate machinery if you have these symptoms.