I have been on 2000 mg/daily metformin for over 2 years and have never had a problem with this, nor have I ever heard of this in metformin use. I also take actos and that can cause changes in the menstrual cycle. Stress can also casue changes in your cycle. See a DR if you don't get your period soon.
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Thanks for your reply, i asked my nurse and she said it could be due to the tablets or due to my change to healthy eating. I know i am not pregnant cos i have been sterilised! Has anyone else had this happen to them? Thanks again