No one is encouraging you to right now, under normal circumstances when fresh supplies are available, take or use expired drugs.
But truthfully, I am always surprised when I hear people talking about what they would do AFTER SHTF “Ewwww... I’d never eat a rat!!” oh OK then just run down to that Chinese deli on the corner and get some take out... that deli burned down 2 years ago!!! In that case, do you want dark-meat rat or rat-tails???
No, no! I wasn't implying that. I just want to be sure of my purchases' storage and longevity requirements so that I can plan properly for those requirements. I am comfortable with the knowledge that Fish-mox for example is not going to cause me to grow gills ;P I just have to be comfortable and knowledgeable in what I'm getting into as far as these items go - particularly since I've nearly achieved my interium food storage goals and am now looking at first aid/medical additions.