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Antibiotics and your cycle?

by zerogirl86, Feb 17, 2009 07:09AM
Does anyone know if antibiotics can mess up your menstrual cycle?  Up until a week and a half a go I was on antibiotics for a UTI and just yesterday I noticed spotting which I thought was weird because it's pretty rare for me to have breakthrough bleeding.  Now today it looks like it could be my full-on period.  But I'm not due for my period again until the end of next week.  So it's a full two weeks early.

I know antibiotics can mess with the effectiveness of your birth control (which I am on but was careful and used back-up during the antibiotic courses) but can it also change your cycle around?

Thanks
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