How long does metformin take to regularize cycles and ovulation? (pcos patient with irregular ovulation)

6 mos. If it's going to work, it usually does it in less than 6 mos. , if you're on the most effective dose of 2000 mg/day.
No change. While many physicians prescribe metformin to their pcos patients - it does not restore normal cycles. You will not likely see much difference unless you are losing weight - after 30 pounds of weight loss the cycles frequently return to normal. I don't know if the metformin will help with weight loss.