I started getting the migraine aura after taking Ribavirin for a hepatitis C treatment. Everytime I would be somewhere that the light was pulsating it would trigger them. Walking past a chain link fence would do it. It would start from a blind spot in my vision from a mild stroke that left a small blind spot in my vision. I am now taking verapamil 40 mg three times a day and that seems to be reducing it from everyday to maybe once a week and very mild.