All of the following agents are used for prophylaxis of migraine, Except –
**Core Concept**
Migraine prophylaxis involves the use of medications that reduce the frequency, severity, or duration of migraine attacks. These agents often target the pathophysiological mechanisms involved in migraine, such as vasodilation, inflammation, and neurotransmitter imbalance.
**Why the Correct Answer is Right**
Prophylactic medications for migraine include beta-blockers (e.g., propranolol, metoprolol), anticonvulsants (e.g., topiramate, valproate), and antidepressants (e.g., amitriptyline, fluoxetine). These agents work by modulating the trigeminovascular system, reducing inflammation, and stabilizing neurotransmitter release. For example, beta-blockers inhibit the release of vasodilatory neurotransmitters, while anticonvulsants reduce the excitability of trigeminal nerve fibers.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided, so we'll move on to the next one.
* **Option B:** This option is not provided, so we'll move on to the next one.
* **Option C:** This option is not provided, so we'll move on to the next one.
* **Option D:** This option is not provided, so we'll move on to the next one.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that many migraine prophylactic agents have a narrow therapeutic index, and their efficacy may be dose-dependent. For instance, topiramate's efficacy in reducing migraine frequency is closely related to its plasma concentration.
**Correct Answer:**
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