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A 19-year-old female asked:

I am on keflex for acne, as well as mononessa for bc, my dermo told me keflex would not interfere with the bc pills- is this true?

1 doctor answer1 doctor weighed in
Dr. Jenny Sung
Pediatrics 24 years experience
Conflicting studies: 1st of all, no oral bc is 100% effective in preventing pregnancy. 2nd, antibiotics can interact with bc and possibly reduce bc effectiveness. 3rd, study results are conflicting -- some said antibiotics use while on bc increases risk of pregnancy, others said they don't. Advice: if worried, use a 2nd method of bc such as condom (which can lower risk of contracting stds).

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Last updated Jul 12, 2017

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