I am taking Qulipta 60 mg, the strongest they make. It was helpful for awhile in reducing the number of migraines per week, but after 3 months its effectiveness has dropped off to nearly zero. So, back to Flunarizine which also worked for me for a year before it lost its effectiveness- that's why I started Qulipta. My doctor figures I will be switching back and forth between the 2 drugs every few months. Re constipation with Qulipta, I had a minor problem with it at first on the starting dose of 30mg then it went away after 2 weeks.