Yes, you are absolutely allowed to carry an EpiPen (epinephrine auto-injector) on a plane. In 2026, TSA and international aviation authorities classify it as a medically necessary liquid, meaning it is exempt from the standard "3-1-1" rule for liquids and gels. You should keep your EpiPen in your carry-on luggage rather than checking it, as you may need it urgently in the event of an allergic reaction during the flight. It is highly recommended to keep the device in its original packaging with the pharmacy prescription label clearly showing your name. While not strictly required by TSA for domestic flights, having a doctor's note or a copy of your "Anaphylaxis Emergency Care Plan" is helpful for international travel and can speed up the security process. You should inform the security officer that you are carrying the device before your bag enters the X-ray machine. There is no evidence that airport X-ray scanners harm the medication, but you can request a manual visual inspection if you prefer.