The military program to test the shelf life of medicines is called the Shelf Life Extension Program. It was conducted in 1986 with the FDA performing the laboratory analysis. The SLEP site is now restricted and you must be registered to access it but when it was open I recall that most of the drugs tested fell into the 15 year shelf life with a few exceptions. The exceptions included liquid antibiotics and liquid vitamins. Having said that, it's important to note that these were unopened original packaging stored in ideal conditions. Once the package is opened the date fell to 1 year. Since then I know they have done studies on Tamiflu as well as Potassium Iodide.
The state stockpiles are rated at 2 years for Cipro and Doxy. I'm not sure why the difference.
I hate making a post like this with no source to refer to but the SLEP site is now restricted. You can do a google on SLEP. There is a lot of documentation out there if you want to wade through it. If anyone has a credible source please post it.
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