Can you take v's or alps when the expiry date has passed? Does the medicine loose it potency, or cause you to fill unwell if you were to be taken any of the medicine mentioned daily, whilst there were in date.
Most listed expiration dates are long before it actually expires. Fent patches are an exception but what you are talking about is very stable and should be fine up to a year or two after expiration. If anything it would lose potency, not mutate into something that was dangerous.