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Cluster headache (CH), the most common of the trigeminal autonomic cephalalgias and one of the most painful primary headache disorders. It is characterized by attacks of severe, strictly unilateral pain that is commonly retro-orbital, lasting 15-180 minutes, and occurring from once every other day to 8 times a day (1). CH pain is associated with ipsilateral conjunctival injection, lacrimation, nasal congestion, rhinorrhea, forehead and facial sweating, miosis, ptosis and/or eyelid edema, and/or restlessness or agitation (1). CH attacks have both circadian and circannual rhythmicity. A strong predilection for attacks during sleep is well recognized. In the episodic form (ECH), bouts of attacks alternate with periods of remission of varying duration. In the chronic form, there tends to be an absence of remissions within one year, or the presence of remisson period lasting less than 1 month (1). The management of CH includes (i) patient education about the nature of the disorder; (ii) advice on lifestyle changes (e.g. avoiding alcohol during an active cluster period); (iii) prompt treatment of the acute attack; and (iv) prophylactic treatment (2). The brief duration and severity of the CH attacks necessitate the use of rapid-acting pain relievers. Subcutaneous sumatriptan and inhalation of pure oxygen are the two most effective acute treatment options for patients with CH. Prophylactic treatment of CH is classified into maintenance prophylaxis and transitional prophylaxis. When treating ECH, maintenance prophylactics are generally continued through the cluster period and restarted at the onset of the next cluster period (2). For maintenance prophylactics, verapamil is considered to have the best balance of efficacy and tolerability (3). Due to its delayed onset of efficacy of usually 10 to 14 days and the required slow titration of the dose to increase tolerability, transitional prophylactics (e.g. corticosteroids) are administered for short durations as adjunctive therapies to maintenance prophylactics to abort the cluster period or to further reduce the frequency and severity of CH attacks (3). The common reported side effects of verapamil are heart failure, low blood pressure, increased liver enzyme levels, atrioventricular block (a condition where heart impulses are delayed), changes in heart rate, constipation, and shortness of breath. Although the combination of verapamil and corticosteroids is effective in treating most patients with CH, these medications may not always be used because of their side effects. Other maintenance prophylaxes (e.g. lithium, topiramate, valproic acid, gabapentin, and baclofen) are not always effective for all patients and may have side effects of their own. Naratriptan, a 5-hydroxytryptamine1B/D (5-HT1B/D) agonist, is an effective and well-tolerated abortive anti-migraine medication (4) and has been used preventively in transformed and menstruation-related migraines (5, 6). Naratriptan has also been reported to reduce the frequency of CH attacks (7-9). It has been suggested for the preventive treatment of CH because of its long half-life. In this issue of Internal Medicine, Itoh et al. (10) report that the administration of naratriptan 2 hours before attacks appeared to achieve a good response in patients with CH in Japan. In their study, among the 43 cases, 37 (86.0%) showed improvement in CH with naratriptan. Twenty-two patients received other preventive treatments (51.2%) in addition to naratriptan, whereas 21 received only naratriptan (48.8%). Nineteen patients (44.2%) showed effective improvement in CH with the use of naratriptan alone. Provided that safety issues with daily usage are resolved, naratriptan may become an alternative option for prophylactic treatment in patients with CH. Its application for the treatment of refractory CH and chronic CH is anticipated. Because spontaneous remission is possible in CH, a doubleblind placebo-controlled study using naratriptan as a preventive treatment for CH is needed to provide further insight regarding this treatment modality in the near future.

Naratriptan May Become an Alternative Prophylactic Option for Patients with Cluster Headache