Antibiotics reduce the effectiveness of oral contraceptives.
November 2002
Women have been warned for decades to use backup contraception when taking oral contraceptives and antibiotics together.
This all started back in the '70s when a few women on oral contraceptives took rifampin and then got pregnant.
Additional anecdotal reports started popping up, suggesting that other antibiotics might be related to unwanted pregnancies in women taking oral contraceptives.
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