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A member asked:

What percentage of people get pregnant while on birth control and antibiotics?

A doctor has provided 1 answer

Overhyped...: Contrary to popular belief, most common antibiotics don't seriously affect birth control pills. Rifampin, used to treat Tuberculosis is an exception. Penicillin, amoxicillin, ampicillin, sulfamethoxazole/trimethoprim (Bactrim), tetracycline, metronidazole have a small effect but pregnancy from this is very rare. Best wishes!

Answered 3/30/2016

2.1k views

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