I have a couple of years worth of regular and
had a couple of years worth of Lantus but over the last few months my T-cells finished off my beta cells and my dose doubled - so I only have one year of Lantus right now. I had been using much less than my original prescription called for so stocking up was easy, it's taking me a little while longer to get back up to the supply I'd like to keep now.
That's figuring a supply with refrigeration of course. But my investigating indicates most insulin looses only 2%/yr effectiveness at 40* which is why the expiration is set at 2 years (it must be 95% potent to meet the rules) - so theoretically at 3 years it would still be 96% potent. Even at ground (root cellar) temperature of 50-55* I'd guess it would only accelerate degradation somewhat and at 2 years be nearly good as new. I'm pretty sanguine about grid reliability for the foreseeable future but if short term outages became a problem in summer I have an old walk-in freezer compressor unit that could be rigged up to the windmill, add lots of insulation and ground source tempering and I think I could keep the temps down in the 40's easily.
Ah ha! Here from my notes:
Lantus was found to meet stability criteria for at least 24 months when stored between 36 and 46°F (2 and 8°C) (Aventis, data on file). Accelerated stability testing at 77°F (25°C) revealed a slight loss in activity by 9 months. Testing at 95–102°F (35–39°C) for 1 month revealed an increase in impurities without loss of activity. Lantus should be stored in a refrigerator to maintain the labeled expiration date. In the absence of refrigeration, unopened vials of Lantus should be discarded after 28 days.
Also, Lantus (which to me is most important because I can easily get by with little to no quickly digestible carbs) also is not tolerant at all to light and freezing kills it dead so that is a big no-no.
Right now I'm using regular that is past expiration (again because my perscription was for much more than I actually needed) and I see no difference in dosage required.
I have lots of syringes (virtually unlimited supply if I reused them till the needle bends) and test strips for maybe a year currently (if I use 3-4 a day) of course in a pinch I'd not be so diligent and wouldn't be quite as concerned about the tightest control possible so I'd only use them periodically to check my fasting sugar to be sure I wasn't way out of control. Strips expire at 2 years so calibrating solution would be good to have or make.
So, I'm not quite done yet! Even if the whole thing came down completely I'd still be around for a couple of years easy.
P.S. here is a good link I found.
http://care.diabetesjournals.org/conten ... l.pdf+html