Doxycycline had a real exasperation date it decays over time to toxic levels under no circumstances take expired doxycycline it will absolutely trash the liver and kidneys sometimes fatally just FYI stay safe brother’s.
I wasn’t referring to medicines.
It was to canned and boxed foods.
With meds, one has to be very careful for the reason you stated.
Penicillin is another one that goes bad, and Synthroid has a very short shelf life.