Bring Wet Wipes to wipe down tray/armrest/window/wall
I speak from experience...ended up with hives once (local) on my face where it touched the wall/window when I fell asleep on a Southwest pn/free flight.
But having the pharmacy label on the epis is just smart anyway. Same with having an extra paper Rx should you need to hit a pharmacy on travel. The clear-bag w/ them on the tray is part time-saver (in case they want to look, you don't get pulled out of line and luggage searched) and also their policy (needles, etc. out in tray for inspection). Sometimes they care, sometimes they don't. Half the time someone picks it up and looks. If it were in my luggage, I'd have to be stopped/searched.