It really depends on the woman..kind of an individual thing. Some ladies have hormones that can be swayed by a low dose, others need a larger dose. The thing that can make dosing met tough is that it is unlike other meds that are based on weight...this is based solely on how your hormones move.
The minimum effective dose that medical literature usually indicates is 1500 mg, so many Dr's start there (There is several articles supporting this in the FAQ thread at the top of the metformin page if you want to print them up to show your Dr.). After several months ont hat dose if the labs haven't budged, they generally consider an increase to the maximum which is ~2550 per day.
Hope it helps and good luck at your appointment! 
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Christy
33 yrs, 1 precious hubby, 2 miracle kids, At Goal Wt for 4 yrs, Trygly's down 445 pts, Free Androgen down from 20 to 2, 3 half 'thons ran, 2 mtns hiked, 1 crazy run in the Rockies, 4 forest trail races, profiled in 2 magazines...1 woman determined to kick PCOS butt!
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Before & Aug 2007
'08: Duathlon and another half? | 
What mg of Met works best? 
