6. Any use (within 30 days of randomization) of migraine prevention medication including: Valproate (Depakote), topiramate (Topamax), cyproheptadine (Periactin), montelukast (Singulair), or botulinum toxin, type A (Botox); Cardiovascular drugs (acceptable if reason for use is for treatment of cardiovascular disease and the subject has been on a stable dose; MAOIs within 30 days of randomization