I am a bit guilty of being overly clever; I tend to use the term anticholinergic as a drying agent and thus decongestants. It is slightly misleading but anticholinergics have been used as decongestants for over 70 years. Contac cold medicine - since forced off of the market - contained hyocyamine, atropine and scopolamine, all tiny doses of anticholinergics (scopolamine was used as a truth drug in WWII {Where Eagles Dare}.
Ipatropium, in the form of ipatropium bromide, is used to treat respiratory distress. Diphenhydramine - Benadryl - is popular as both a decongestant and a sleep aid (but not for me.) I take anticholinergics chlorphenamine (chlorpheniramine maleate) and doxylamine (sold as Unisom - a sleep aid) which work well for me.
I add fexofenadine (brand name Allegra), a 24 hour decongestant and phenylephrine HCl.
Forgive the slide but I fell into it. :^)
Oh my goodness! I was thinking of the word “cholagogue” and maybe same root, I was way off. I have heard of scopolamine. Wow, atropine, too, probably such tiny amounts so harmless.
Just wondering - do you have more than one brain?