Yeah, the guys here are correct.
I work in the medical field and all my expired medication is either used in training scenarios or shipped to "third world" (sorry for using that term, I hope you know what I mean) countries and they utilize them for YEARS to come. It all comes down to liability.
Now, that being said - some meds DO in fact have expiry dates and should be taken seriously. However, pills are VERY rarely one of the culprits. Personally, I'd still take em'