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A 41-year-old member asked:

I had intercourse without a condom during ovulation did the cephalexin cancel out my birth control pills?

1 doctor answer1 doctor weighed in
Dr. Timothy Raichle
Obstetrics and Gynecology 22 years experience
No: This is a common myth. Antibiotics, except for one called rifampin, do not affect the efficacy of the birth control pill.

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A 50-year-old member asked:

I had intercourse without a condom during ovulation and my boyfriend came in me, did the cephalexin cancel out my birth control pills?

1 doctor answer2 doctors weighed in
Dr. Byron Hapner
Specializes in Obstetrics and Gynecology
No: Typical antibiotics do not decrease the normal effectiveness of birth control pills. This is a common myth.

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Last updated Mar 17, 2014

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