My boss's mother would accumulate medicine discarded from pharmacies because it was due to expire. She would sort through it and some medications weren't worth the risk after their expiration date and were discard. The remainder were boxed up and flew with her to a clinic in Mexico where they treated the poor for miles around. Yes, some were good well past their expiration date but others were not. Unless you know for sure, it's best to ask an expert because some drug become dangerous as they age.