I have used pain killers that were 5-years old and had them work. But I don’t know really know the answer as to how long meds really keep. I would guess that they are made to expire in a short time as they would not want lots of old meds floating around for years. And it’s more profitable to have people always buying more. I can understand this in a way. But I don’t think you will get a good answer as to how long they will last beyond the expiration date.