Migraine treatment improved considerably with the advent of the 'triptans' in the 1990s. While the drugs used previously for headache treatment had efficacy, some compounds had bothersome side effects and their overuse could lead to severe complications. In the early days of the triptans, it was widely presumed that migraine was no longer a treatment problem. However, it has gradually been recognized that a significant proportion of patients are not responsive to triptans or do not tolerate them. It is now clear that, even with effective treatment, patients with frequent migraine attacks are...