What is the efficiency of Accutane second time around?

I’ve had one course of accutane- worked great for two years now it’s back… what’s the level of relapse the first time vs second time (is it lower second time) and what’s the percentage of people who need a 3rd round of treatment. I also suffer with headaches… can accutane treatment permanently give you headaches even after you stop treatment? Also triptan and accutane you can’t take together?