Hi, yes, a short time ago I had some kind of an allergic reaction after taking several OTC things. I took Zantac 150, quite a few stool softeners, or Magnesium (for constipation) possibly some Gas-X pills (3) and a Tylenol... over the course of a few hours, I totally forgot about the ones I took earlier so b/4 bed took a Tylenol and began having shortness of breath, I felt my face swelling. Paramedics and they advised 2 Benedryl and then I was fine. I don't know if there was an interaction or if I just took took darn many things?