How Long Does It Take For Metformin To Work After Taking It. 4 days, or if you count it in hours, then it will be 96.8. 500mg a day is the smallest dose and probably just to get you used to them.
Also you are taking a small dose of metformin so at some point after it has kicked in you might want to ask doc to up it , if it is not keeping bgs low enough. Also, i wake up during the night ravenously hungry.
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Although metformin starts to work quickly (within a week), the risk of hypoglycemia (dangerously low blood sugar) is very low and more likely to happen if you are on multiple diabetes medications. And is there any chance that you may have reintroduced a few sneaky carbs (also know as carb creep) which may have helped it to rise again?