Where can I find more info on Metformin,I started taking metformin 500mg extended release tablets for type 2 diabetes about a month ago, once a day was prescribed and I lost some weight also my urine has darkened and sexual desire increased is this a common side affect and will it go away? I can't find anything about these type of side affects or is it because my sugar is regulated. I don't seem to have any other side effects.