beaker
NES Member
I have meds stored in a vacuum bag, and in a dark cool place. I have to think removing most of the oxygen and moisture will extend the liffe.Do you have them in tablets or capsules? I think tablet form is a little better for storage. Doxycycline in tablet form is in the Strategic National Stockpile. The expiration dates on those batches have been extended multiple times. At some point they will just be less effective but so far so good on that.
Toxicity from old tetracycline is still debated. The reports of that were few and from considerable time ago. Modern manufacture of tetracycline is probably just fine. All the same I wouldn't take it as far past the expiration date as I would doxycycline (since that's been tested thoroughly).
But the thing that everyone stresses is 100% true: Store medications in a COOL, DRY, DARK place. All three are important. We even keep our extra bottles of vitamins, ibuprofen, etc in the basement in a closed box. I don't think storing in a freezer is better. Have you opened any of the frozen containers? Is there condensation on the inside?