BG, the upper limits for a non-diabetic A1c reading is 5.9 so your reading of 6.5 is considered to be in the "above normal" (pre-diabetic or diabetic) range. The full onset of action for metformin can take up to 30 days. Although hypoglycemic episodes have been reported with metformin, such incidents have been relatively rare. Your doctor seems to know what he/she is doing and I would recommend following his/her advice and guidance.View Thread