I have taken Viagra 10 years after its expiration date. The results? EXACTLY the same as freshly purchased Viagra.
At the time, I consulted with a friend who is a pharmacist and he explained this to me:
- Expiration dates on medications have everything to do with drug companies limiting liability and nothing to do with drug safety.
- With the exception of some tetracycline antibiotics (which can become toxic over time) and nitroglycerin, all meds are safe to take after the expiration date.
- It's true that medications do lose some potency over time, but after, say, 10 years, we're probably talking about only 2% or 3% potency will be lost -- if that.
In fact, the US Army found some codeine tablets a few years back that were left over from WW2. They tested the pills. The findings? The codeine was still effective and perfectly safe to take for pain relief.