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Pathway Description
Rizatriptan Mechanism of Action Action Pathway
Homo sapiens
Drug Action Pathway
Created: 2023-09-06
Last Updated: 2023-11-27
Rizatriptan is a triptan used to treat migraines with or without aura. Rizatriptan is a second-generation triptan and a selective 5-HT1B and 5-HT1D receptor agonist. Rizatriptan is not indicated for the prophylactic therapy of migraine nor the treatment of cluster headache. Rizatriptan has a weak affinity for other 5-HT1 receptor subtypes (5-HT1A, 5-HT1E, 5-HT1F) and the 5-HT7 receptor but has no significant activity at 5-HT2, 5-HT3, alpha- and beta-adrenergic, dopaminergic, histaminergic, muscarinic or benzodiazepine receptors. Rizatriptan is a selective agonist at the 5-HT1B and 5-HT1D receptors on intracranial blood vessels and sensory nerves of the trigeminal system. It binds to these receptors with high affinity. The exact mechanism of action of rizatriptan has not been fully elucidated; however, several documented pharmacological actions of rizatriptan may contribute to its antimigraine effects. Rizatriptan causes vasoconstriction of intracranial extracerebral blood vessels, which is thought to occur primarily via 5-HT1B receptors. Rizatriptan also inhibits nociceptive neurotransmission in trigeminal pain pathways. It attenuates the release of vasoactive neuropeptides by the trigeminal nerve, which is thought to occur via neurogenic and central 5-HT1D receptors. Rizatriptan inhibited neurogenic dural vasodilation and plasma protein extravasation in animal studies.
References
Rizatriptan Mechanism of Action pathway References
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