A 45-year-old man presents with recurrent episodes of severe, stabbing pain in the right orbit and supraorbital region lasting 30–90 seconds, occurring 5–15 times daily. Each attack is accompanied by ipsilateral conjunctival injection and tearing. Between attacks, the patient is completely pain-free with no refractory period. Brain MRI with pituitary protocol is normal. The condition marked **A** in the diagram is suspected. Which of the following is the MOST appropriate first-line preventive agent for this condition?
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