Place the Epipen in its own clear plastic bag or container that is easy to access. Put the bag with the Epipen in your carry on luggage. You can quickly pull out the Epipen if the security officer requires a visual inspection. If the Epipen is mixed in with other items then it can take longer to find.
Request for a visual inspection. The x-ray will not harm or damage the Epipen in any way, but the security officers may require a visual inspection.
Carry a doctor's note with you detailing your allergy and why you require the Epipen. This is not required: But it can speed you through the security check point, particularly if the Epipen doesn't have a professional prescription label affixed to it. The label and note are not required, but it can make the screening process go faster. You must explain your allergy and why you carry the Epipen, at the very least.