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A member asked:
I am taking clarthromycin, and was supposed to start my period on tuesday, i haven't had sex in 3 months, is it normal to miss your period on bc?
A doctor has provided 1 answer
OC probs with antibx: Antibiotics interfere with the effectiveness of oral contraceptives. But don't usually prevent periods from occurring. There can be hormonal variation to account for a missed period. First step check gyn if your period doesn't arrive. Use protection backup if you have sex until you've seen your gyn.
Answered 9/8/2012
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