NCIt definition : The hydrochloride salt form of naratriptan, a sulfonamide with selective serotonin
(5-HT) 1 receptor agonistic activity and anti-migraine property. Naratriptan hydrochloride
binds selectively and with high affinity to the 5-HT1D and 5-HT1B receptor subtypes.
Activation of these 5-HT1D/B receptors located on intracranial blood vessels leads
to vasoconstriction and provides relief of migraine headaches. Naratriptan hydrochloride
may also exerts its effect by stimulation of 5-HT1D/1B receptors on sensory nerve
endings in the trigeminal system thereby decreasing the release of pro-inflammatory
neuropeptides.;