I suspect that the 'danger' of meds is simply that they lose some of their potency, rather than becoming dangerous. I know the Army did some testing on meds in high heat, and were surprised that more stuff didn't go bad. IIRC, it was mainly some antibiotics that went bad. I think Neomycin is one with a relatively short shelf life.

The so-called expiration dates printed on the labels are not a good indication of a real expiration date, I believe that is a law. The Army testing indicated that many meds are good for YEARS.

This may have been the article: Many Medicines Are Potent Years Past Expiration Dates

Sue