Triptans, sold under the brandnames Imitrex, Zomig, Amerge, Maxalt, Relpax and others, are a range of highly effective drugs used to treatand .
The mechanism of action of the drug(s) has been debated since the 1980s.
It's currently thought that Triptans work by a (possible) combination of vaso-constriction and the blocking of 5-HT1D receptors, and/or because of its effects on nitric oxide levels.
[…] there was always a debate about its mechanism of action, and it still remains unclear today.“
Source : Wikipedia
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