If you plan to fly, I recommend you carry a note from your allergist making it perfectly clear that it is necessary you be allowed to carry your emergency medication on the flight.
As allergy awareness becomes more prevalent, cases where staff have harassed passengers for trying to take their medication on the plane are decreasing, but are still present. Always be on the safe side! You don’t want to expose yourself to unnecessary risk because your emergency medication was confiscated.
Pro Tip: With new restrictions on carrying liquids, I recommend taking Walgreens’ single dose Wal-dryl. Wal-dryl is diphenhydramine (the same medicine as Benadryl) except easier to carry.
Wal-dryl Single Dose