My wife is currently in Central Asia visiting her mother. Since no prescription is needed for most medicines (all painkillers, tranquilizers, basically narcotics need prescriptions), she will be bringing back some medical supplies to include general purpose antibiotics. According to US law, one can bring in a 90 supply of medication so... Question: I am wondering if I store these antibiotics in sealed Mylar bags with O2 absorbers if it will slow their degradation, extending their expiration date? I believe most antibiotics are good for ~2 years and even longer but you lose strength after 2 years so wondering if storing them in this manner might keep them at full strength longer.