I used to be Rx'ed these by my GP many moons ago for terrible headaches which would end up with me heaving my guts and finally the dry heaves. It was nasty! Unfortunately, I used to go through them too quickly but honestly, I was very naive to this stuff back then and if I felt one coming on, I would damn well take a pill! My doc would tell me to not take them so often and I'd explain the problem: solution in hand, why wouldn't you use it to avoid what I'd have to go through. Nastiness!
I tried to explain it to him like this - if you were dead dry in the desert and someone said he had water for you. Would you say, No I'm good, I think I had some yesterday? Or would you damn well drink that shit down? For what I'd have to deal with, I go with "solution in-hand" every time. Sorry for the rant but I really really like how they made me feel. BTW, eventually I got sent to a Pain Mgmt. clinic and that ended up much better. But seriously!