US Army did a study in I think ‘86 as part of SLEP, Shelf Life Extension Program to find out about drugs, which they have stockpiled in the many-billions-of-dollars-worth quantities.
I’ve read parts of it available onle and the conclusion was that for almost all medications, it is reasonable to assume 90% effectiveness and no significant deterioration for ten years after packaging, in some, it was more.
There are exceptions, like tetracycline.
But even something like veterinary tetracycline comes stamped with I believe a four-year shelf life after manufacture.
I saw reference to that report. I get hyper cautious on this aspect of prepardness because of the potential hazards involved. Like i said, I cycle my foods, but can’t reasonably do that with these kinds of meds. I’m continuing to do more online research and may even email some of the authors of these web sites for better details.
Dr Bones & Amy talk about the tetracycline myth as well.
There actually wasn’t any study done to determine if “expired” tetracycline caused renal failure. This myth is based on one incident where someone died, unobserved, of renal failure. They found out he had taken “expired” tetracycline and just blamed it on that without any real connection besides circumstances.