Vicodin Expiration question.

[PooSniper]

Hey I searched the forum for this but found very little: I found some Vicodin 5/500. However it is pretty old, one bottle says its expiration is 10-01 the other bottle says it expired like 16/98. These are pretty old obviously and I would expect them to decrease in potency. I have tried them and they got me high. However I was also still somewhat high on Adderall when I took them so, I would not expect the amount of Vicodin that I took to be a very good indication of potency.

My question is whether or not they lie about the expiration date for Vicodin like they do with Adderall. For example if your Adderall expired during 2005 it would still have like 2 years before it would start to really start losing potency. Yea so, if this is true I want to know how many years I can safely subtract from the time that the Vicodin has been losing potency.