And therin lies the problem. Everything I've found is either a simple decongestant and stimulant (psuedoephidrine) or knocks me on my butt but would take care of a hystamine reaction and maybe buy 5-10 more minutes if someone just found out the hard way they are allergic to something. That latter is the effect I want, but not something that I can use as a sleeping pill on the principle that I want to be able to call for help.