Metformin lasts in your system up to 48 hrs so missing a couple will only lower the level in your blood.But leaving it longer means when you resume you have up to a month for it to become effective again.
If you are new to Metformin it can take up to 2 months for your system to adapt.( Metformin can cause stomach upsets etc.).If you have been taking it for some time you may need different meds ,/ extended release version.Talk to your doc.asap.

This question should be refered to your doctor or even a pharmacist who can better advise you what to do.

If your pills are 500 mg each, then yes some diabetics do take up to 2000 mg per day.

I believe it is the maximum dose (although some doctors may prescribe up to 2500 mg I believe)

Does anyone take 4 pills a day metformin

Metformin used to bother me when I first was diagnosed, but after I got started using Insulin as well the metformin did'nt bother me as much. I now use Humulin "R" , Baslgar, and Metformin plus trying not to eat the wrong foods. 😇