Methysergide
（重定向自Sansert）
![](/Images/godic/202502/09/Methysergide_chemical_structure.svg1606.png")
Methysergide (1-methyl-D-lysergic acid butanolamide or UML-491) is a prescription drug formerly used for prophylaxis of cluster headaches/migraine headaches, but is no longer recommended due to retroperitoneal/retropulmonary fibrosis.