I'm curious - I hadn't noticed it yet, but I'm at a place where my snoot always goes crazy, haven't taken my Claritin in a while, and seem to be totally ok.
I believe amphetamine or at least the levo variant used to be sold and used as a decongestant. I may be conflating that with benzedrine, but certainly amphetamines have something in common with ephedrine on a chemical or structural level (I never took organic chemistry so I will make Mark Twain proud and won't open my mouth and remove all doubt). (Edit: for clarity, I was thinking of pseudoephedrine, Sudafed, here, as far as why a resemblance to ephedrine would suggest anti-allergy or decongestant effects)
Is there something there or