Optimizing the dose of zolmitriptan (Zomig,* 311C90) for the acute treatment of migraine

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Abstract
This study investigated the efficacy of zolmitriptan (Zomig, formerly 311C90) in acute migraine therapy. Patients with a history of migraine were randomized in a double-blind, multicenter, placebo-controlled, dose range-finding study of oral zolmitriptan 1, 2.5, 5, or 10 mg versus placebo for the treatment of a severe or moderate migraine headache. Patients with persistent or recurrent headache 4 to 24 hours after the initial dose, who did not take escape medication, were eligible to receive a second blinded dose of either zolmitriptan or placebo. Of 1,144 patients treated, 999 evaluable patients completed the study. The headache response rates with zolmitriptan doses > or = 2.5 mg were 44 to 51% at 1 hour, 65 to 67% at 2 hours, and 75 to 78% at 4 hours (all significantly superior to placebo). Also, zolmitriptan effectively relieved migraine-associated symptoms such as nausea, photophobia and phonophobia, and reduced activity impairment. Rates of headache recurrence, headache persistence, and use of escape medication were lower with zolmitriptan doses > or = 2.5 mg than with placebo. In patients with persistent or recurrent headache, a second zolmitriptan dose effectively treated both headache and nonheadache symptoms. Zolmitriptan was well tolerated, with a lower incidence of adverse events being reported with doses < or = 2.5 mg than with those > or = 5 mg. Zolmitriptan is a well tolerated and effective acute migraine therapy providing rapid relief of migraine headache within 1 hour. A clear dose-response relationship between efficacy and tolerability suggests that 2.5 mg is the optimal initial dose for the acute treatment of a migraine attack.