As for physical dependency... well, I have heard of the triptan Maxalt causing
rebound headaches, which could be considered a type of physical dependency maybe... but, out of all of the triptans, the ONLY triptan that has shown this is Maxalt, not Imitrex. So, Imitrex is not a type of medication that you can become dependent on physically. So please don't worry about becoming dependent on the medication!!! Use it when you are in pain if it works!!