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Expiry dates are present for two reasons, the first is that approximately only 90% active ingredients remain and the second is that the tablets may have deteriorated into other metabolites. Unfortunately some of those metabolites may have serious side effects and we cannot predict those with accuracy.
I would not use the product after the expiry date.
Your pharmacist should have checked that you should have used up the medication before the expiry date occurred (unless you have had these tablets for some considerable period).