Which drug class causes vasoconstriction in large intracranial arteries?

Which drug class causes vasoconstriction in large intracranial arteries?

• A. Anti-infective
• B. Anti-impotence
• C. Antimigraine
• D. Antiprotozoal

Answer: (C)

The main concept is that antimigraine drugs relieve migraine by constricting the blood vessels in the head. In migraine, dilation of large intracranial arteries is associated with pain, so drugs that cause vasoconstriction help reduce the throbbing headache. Many antimigraine agents, especially triptans, are 5-HT1B/1D receptor agonists that directly trigger constriction of large meningeal arteries. This vascular effect, along with inhibition of inflammatory mediator release, brings relief. Ergot alkaloids, another antimigraine option, produce cranial vasoconstriction through mixed actions on serotonin and adrenergic receptors. That’s why antimigraine is the correct class here. The other drug classes listed don’t target cranial vasoconstriction: anti-infective, anti-impotence, and antiprotozoal drugs act on infections or unrelated physiological processes and don’t produce the same constriction of intracranial vessels.

The main concept is that antimigraine drugs relieve migraine by constricting the blood vessels in the head. In migraine, dilation of large intracranial arteries is associated with pain, so drugs that cause vasoconstriction help reduce the throbbing headache. Many antimigraine agents, especially triptans, are 5-HT1B/1D receptor agonists that directly trigger constriction of large meningeal arteries. This vascular effect, along with inhibition of inflammatory mediator release, brings relief. Ergot alkaloids, another antimigraine option, produce cranial vasoconstriction through mixed actions on serotonin and adrenergic receptors. That’s why antimigraine is the correct class here. The other drug classes listed don’t target cranial vasoconstriction: anti-infective, anti-impotence, and antiprotozoal drugs act on infections or unrelated physiological processes and don’t produce the same constriction of intracranial vessels.