\(5-HT_{2A/2C}\) antagonist used in migraine
\(5-HT_{2A/2C}\) antagonist used in migraine
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- Methysergide
- Ketanserin
- Sumatriptan
- Rizatriptan
The Correct Option is A
Approach Solution - 1
Methysergide is a serotonin receptor antagonist primarily targeting the \(5-HT_{2A}\) and \(5-HT_{2C}\) receptors. It has been used as a prophylactic treatment for migraine by preventing vasoconstriction and platelet aggregation associated with migraine attacks. - Methysergide blocks serotonin-induced vasoconstriction, thereby reducing migraine frequency.
- Ketanserin is also a \(5-HT_{2}\) antagonist but primarily used as an antihypertensive agent.
- Sumatriptan and Rizatriptan are \(5-HT_{1B/1D}\) receptor agonists (triptans) used for acute migraine treatment, not antagonists.
Hence, Methysergide is the correct drug categorized as a \(5-HT_{2A/2C}\) antagonist used in migraine prophylaxis.
Approach Solution -2
The question asks for a drug that blocks the 5-HT2A and 5-HT2C serotonin receptors and is used for migraine. Check the receptor target and clinical use of each option.
- Methysergide: Methysergide is an ergot derivative that blocks \( 5\text{-}HT_{2A} \) and \( 5\text{-}HT_{2C} \) receptors, preventing the serotonin-driven vasoconstriction and platelet aggregation linked to migraine attacks. This matches both the receptor and the indication asked about, so this option is correct.
- Ketanserin: Ketanserin is also a \( 5\text{-}HT_{2} \) receptor antagonist, but it is used clinically as an antihypertensive rather than for migraine prophylaxis, so it does not match the indication in the question, making this option incorrect.
- Sumatriptan: Sumatriptan is a triptan that acts as an agonist, not an antagonist, at \( 5\text{-}HT_{1B/1D} \) receptors, and it is used to treat an acute migraine attack rather than to block \( 5\text{-}HT_{2A/2C} \) receptors, so this option is incorrect on both counts.
- Rizatriptan: Like sumatriptan, rizatriptan is a \( 5\text{-}HT_{1B/1D} \) agonist used for acute migraine treatment, not a \( 5\text{-}HT_{2A/2C} \) antagonist, so this option is incorrect for the same reasons.
Only methysergide is an antagonist at the \( 5\text{-}HT_{2A/2C} \) receptors and is used specifically for migraine.
Therefore, the correct answer is Methysergide.
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