migraine
"I have used both the pill and the injection form of Imitrex and they are both amazing!  The first time I was given a shot was in the walk-in clinic the first time I had a migraine.  After a very weird initial sensation of kind of a "buzz" I could actually feel the headache dissipating!  The pill form works just as well, but like some other reviewers stated, it does work best if you can lay down for a while."