Fasting test on Metformin?

[KittyKatty]

I'm having my first fasting blood test tomorrow, three months after starting Metformin. But the thing is, isn't it dangerous to fast AND take Metformin? The drug is supposed to lower the blood sugar but if you don't eat, won't it get dangerously low in those 12 hours of no food?

 

[sally and james]

Your blood sugars will not get dangerously low because of fasting on metformin. You might feel rather hungry and very ready for food, but this is not the same as slipping into unconsciousness.
Metformin is not insulin, nor does it promote insulin production. It also only has a very minimal effect on lowering blood sugars. Your liver will release glucose from stores to keep you going - this is what is often called the dawn phenomena.
Sally

 

[Bluetit1802]

I agree entirely with @sally and james