Methysergide (1-methyl-D-lysergic acid butanolamide or UML-491) also known as methysergide maleate, is an ergot derived prescription drug used for the prophylaxis of difficult to treat migraine and cluster headaches.
Methysergide is no longer recommended as a first line treatment protocol by international headache societies, hospitals, and neurologists in private practice, for migraines or cluster headaches as side effects were first reported with long-term use in the late 1960s, and ergot based treatments fell out of favor for the treatment of migraines with the introduction of triptans in the 1980s. [Source: Wikipedia 
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