Metformin is not used just to help women with PCOS or diabetes. Through studies it is known to help regulate a womens menstral cycle. If you are NOT ovulating on your own then you are NOT having normal cycles, which is why you need to take provera to bring on your period. Your doctor prescribed clomid to help you ovulate, but it seems it is not working alone, so he/she is adding metformin. The combination of the two have been known to work better together for some people than the two medications alone.
I have PCOS, but I am not diabetic. I took clomid alone for three cycles, all different levels, and never ovulated. I took metformin alone, for 3 months, and never had a cycle in that time. I was prescribed 50mg clomid and 200mg metformin and started ovulating and having normal cycles. By my fourth cycle I got pregnant.
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In addition, if you don't ovulate on 100mg, I've always heard that the dose should be increase.
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This is not always true, some doctors want to keep you on the same dosage to give your body a chance to respond. With the fact that Laura's doctor is keeping her on 100mg and adding metformin, this will allow her body to react to a lower dosage before trying a higher dosage.
As a word of caution, if your doctor is giving you metformin make sure he/she also gives you a kidney and liver function blood test before starting the metformin and throughout the time of taking metformin. There are chances of the metformin causing liver and kidney function problems, so it is best to keep an eye on them. If your levels are too high before you start taking the metformin, you shouldn't start it. If your levels begin to rise while taking it, you should stop. Before I started taking it, my levels were a bit high, not much over but enough that they wanted to retest me 30 days later. Come to find out it was that I was drinking pepsi. I stopped drinking as much pepsi (because of the extra sugar) in that 30 days and my next test came back a lot lower.
Good luck and keep us posted.