Rizatriptan (trade name Maxalt ) is a 5-HT 1 receptor agonist of the triptan class of drugs developed by Merck & Co. for the treatment of migraine headaches .  It is available in strengths of 5 and 10 mg as tablets and orally disintegrating tablets (Maxalt-MLT).
Rizatriptan is used to treat the symptoms of migraine headaches (severe, throbbing headaches that sometimes are accompanied by nausea and sensitivity to sound and light). Rizatriptan is in a class of medications called selective serotonin receptor agonists. It works by narrowing blood vessels in the brain, stopping pain signals from being sent to the brain, and blocking the release of certain natural substances that cause pain, nausea, and other symptoms of migraine. Rizatriptan does not prevent migraine attacks or reduce the number of headaches you have.