I have done it taking 500mg twice a day. It was not comfortable the first time I did it, to be honest. I believe I had an upset stomach that do. Now I do it maybe 50% of the time and I'm ok.
There are days where I dont feel like eating until lunch, and take my Metformin on an empty stomach in the morning. I've also skipped dinner once in a while, and that's when I take my 2nd dose, and I've been fine.
I think for me, my body just got used to it.
Did you have an upset stomach when you initially started the medication?