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A member asked:
Is the antibiotic keflex one of the antibiotics that weaken the effectiveness of birth control? if so, by how much?
A doctor has provided 1 answer
Urban myth: The problem of antibiotics interfering with hormonal birth control (pill, insert, hormone shots) is very rare -- mostly a theoretical problem. It's not quite an urban myth, but it's very rare. In theory cephalexin (Keflex) could do this, but it's so rare you really needn't worry.
Answered 9/14/2019
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