I was on here trying to find out myself before having to call Walgreens and explain why I had 3 bottles of them and didn't take them because of the fact I have chronic condition that will last rest of my life and read some things that were bad about taking them that long, but husband has no insurance and needs them, anyway as to the question at hand I called anyway (just didn't mention anyone else taking them!) and they said that it is standard at all pharmacies that the shelf life is 1 to 1.5 years on most medications.  Which I imagine that would be the life on their shelf so it would be give or take, don't know.  But basically I got some about a year and half and they said they should be fine.  Hope I helped.