Ok from what I've read on this there has been NO known case of antibiotics causing a unwanted pregnancy. Theoretically some AB's can interfere with the pill but again, its never been proven. On the other hand the thought of a lawsuit where you have to pay for the kid for the rest of its life due to a BC failure brought on by a prescribed antibiotic is enough for your doctor to tell you about the risk
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What happens if I take antibiotics while I'm on the pill?
We do know there are certain medicines that diminish the effectiveness of BCPs. The common antibiotics we use shouldn't affect the metabolism of BCPs. However, there have been some anecdotal reports by pill users who became pregnant while taking antibiotics. While the risk is very low, we encourage women to use condoms for the duration of their antibiotic prescription and for the following 7 days.
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