The max does of Metformin is 2250mg a day so you can take your 500 mg as late as 1 hour before you nexed does and still not go over your daily limit.
So dont fret and just take it.
By the way how often or when is the best time to measure my sugar levels?
Hi,
to be effective metformin should be taken every day. It will be good to get into a routine of taking it at the same time every day.
500 mg is a low dose, so if you miss it at your normal time, you could still take it any time throughout the day. [Maximum daily dose of metformin is up to 2500 mcg/day].
Are you monitoring your blood sugars? This will be helpful for you to identify what foods do and don't raise your blood sugars.
Many people find that eating low carb (cutting most sugars, grains, fruits) will be helpful in controlling blood sugars as well.