A game changer! My migraines have reduced my more than 50% per month! I use it as a preventative and when needed for acute attacks. About 70% of the time when used as an acute treatment, it greatly reduces the pain or even eliminates the pain altogether, as Ling as I catch it early! It works great alone but even better with my rescue meds! I highly recommend it. The only downfall is the cost. My insurance doesn't cover it so I pay out of pocket. The 3 months for $199 is helpful but it is still costly out of pocket. It is worth it though. I miss less work and activities and I don't get that medicine head feeling that some of my medications give me! I am so glad my doctor prescribed it! If you are a wits end with your migraines, give it a try. Even a 50 % reduction is way better than none!