Placebo
DrugAll subjects will receive open label eletriptan 40 mg per attack for the first three attacks in the phase 1 of the study. For the next 4 attacks subjects will be assigned to either eletriptan 40 mg or 80 mg group based on the response in the phase 1 portion of the study. In phase II, in each group subjects will receive eletriptan 40 mg or 80 mg for 3 attacks and placebo for 1 attack. In each group double-blind placebo will be inserted at random.