This reminds me, I've seen Benadryl listed before, not just on this list and wondered since a side affect of Benadryl is drowsiness I wouldn't think it would be advisable to take in a survival situation. I have inherited both sleeping and allergy/sinus problems so I take Benadryl at night to help with both issues and it does make you quite sleepy, its not somehting I'd want to take if lost in the woods unless I knew I had a good shelter and was safe to sleep.