Eletriptan 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, and sensitivity to light and sound. This medication is effective in relieving migraine symptoms when taken at the first sign of an attack. It is not intended for the prevention of migraines or for use in cluster headaches. Patients are advised to follow their healthcare provider's instructions carefully to manage dosage and avoid potential side effects.