NCIt definition : A sulfonamide triptan with vasoconstrictor activity. Sumatriptan selectively binds
to and activates serotonin 5-HT1D receptors in the central nervous system (CNS), thereby
constricting cerebral blood vessels. This may lead to a relief in pain from vascular
headaches. Sumatriptan may also relieve vascular headaches by decreasing the release
of vasoactive neuropeptides from perivascular trigeminal axons in the dura mater during
a migraine, by reducing extravasation of plasma proteins, and by decreasing the release
of other mediators of inflammation from the trigeminal nerve.;