Abstract
Anecdotal reports suggest that clopidogrel may prevent migraine attacks. We undertook a pilot randomised trial. We randomised consecutive migraineurs with four to 15 headache days per 28-day month to receive clopidogrel 75 mg or placebo daily for three months. Headache was primarily assessed with a headache diary. There were no statistically significant treatment effects. The number of headache days fell by 1.9 on clopidogrel and 1.6 on placebo (adjusted difference 0.02, CI -2.07 to 2.12). Headache severity rose by 0.14 points (out of 10) on clopidogrel, and fell by 0.63 on placebo; treatment effect 0.7 points (CI -0.11 to 1.57). The main treatment effect did not depend on the presence or absence of migraine with aura at baseline, a patent foramen ovale (PFO) or atrial septal aneurysm. The evidence is inconclusive, but a multicentre trial would be feasible recruiting from primary care.
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