I don't exactly know what's in the nyquil, but if it's an artificial sweetener, that could be part of the diarrhea.
I would lean more towards it causing you slower stools since it has a cough suppressant and an antihistamine.
It could just be that today the effects of slowing the colon is hitting.
Hope your cold feels better soon
*Heather* Status..Asacol (3 x2 daily); flaring /Dec 22, tapered to every 3rd nite
~diagnosed January 1989 UC (proctosigmoiditis)
~Bentylol (dicyclomine) 20mg as needed; Ranitidine (reflux); Effexor XR 75mg(depression); Pulmicort/Airomir (asthma)
~vitamins/minerals/supplements; Probiotics....(Natural Factors Protec, Primadophilus Reuteri Pearls, Natural Factors Ultimate). @ bedtime
~various digestive enzymes as needed; started Omega 3
~URSO for PSC (or PBC) 500mg X 2 daily (LFTs back to NORMAL!!)
My doc's logic.. "TREAT (FROM)BOTH ENDS" worth it !!!