Wiktionary
isometheptene
n. A sympathomimetic amine used to treat migraines and tension headaches due to its vasoconstricting properties.
Wikipedia
Isometheptene
Isometheptene (usually as isometheptene mucate) is a sympathomimetic amine sometimes used in the treatment of migraines and tension headaches due to its vasoconstricting properties; that is, it causes constriction (narrowing) of blood vessels ( arteries and veins). Along with paracetamol ,dichloralphenazone and dimethylamylamine, it is one of the constituents of Amidrine.