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 dont know if there was an interaction or if I just took took darn many things?
Yes all these are allergies and medicine allergies are permanent you need to get allergy tests for groups causing you allergy and avoid in future if yous are okay with been Chat Doctor.