You're right, the studies for Met indicate a higher incidence of lactic acidosis in pts who take more than the max dose which is 2250 mg per day. You can read about the symptoms and risk factors of LA in the "FAQ" thread at the top of the Metformin page.
I would definetly talk to your Dr about his reasons for a higher dosage and the possible risks involved.
Hope it helps. 
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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? | 
max dose for met? 
