Dad was taken off Metaformin by the doctor last week.Dad’s kidney function has been declining and is now 37. This is the lowest it has been . He had 500mg x 2 a day.Apparently his blood sugars are stable ,almost like normal (whatever that is). Dad wasn’t too impressed when told .But I understand it can be a side effect of Metaformin to decrease the kidney function.She is going to take bloods in 8 weeks time to see how he goes.