However epi-pens are a pain in the rear end in more ways than one. They are full of liquid and have a sharp needle at one end with a "firing device" that shoots the needle into the skin. A veritable magnet for security guards!!!
Interestingly, I am a diabetic, and every time I fly I carry at least 4 pens, spare insulin & needles through security. They have never given them more than a cursory glance, never question them or comment. (though I do carry a doctor's letter in case they do)