Although Neosporin may be one of the drugs that may degrade in storage, most drugs retain potency and safety for years after the arbtrary expiration date of three years (one year in Tenn.) Google -military drug expiration test- to see a slew of articles on this. Cipro is famous for being so stable as to last for years and years. On the other hand insulin, Nitroglycerine and some others don't last that long. This can have a huge economic impact for all of us and can decrease the cost of keeping our emergency supplies up to date.