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Re: birth control pills, antibiotics, and missing a period From: William McIntosh, MD (anonymous@obgyn.net) Tue, 24 Jul 2001 11:43:31 -0500 (CDT) Messages sorted by: [ date ][ thread ][ subject ][ author ] Next message: William McIntosh, MD: "Re: Cervical Stenosis" Previous message: Tracy: "periods and spotting" In reply to: Jessica: "birth control pills, antibiotics, and missing a period" At Tue, 24 Jul 2001, Jessica wrote: > >I understand that antibiotics can cause failure in birth control pills >but I do not entirely understand why. I have been on birth control for >a year and had no problems. I was on 10 days of antibiotics for a UTI >which ended about 4 days ago. My period is due in about 2 weeks. (I >started the antibiotics the week of my period). > >I am planning to continue using another method of birth control until >the end of this cycle. However, I need to miss my next period for an >important event. I have heard that I can skip the sugar pills and take >two paks consecutively in order to miss my period. BUT -- If the >antibiotics did in fact cause my birth control pills to fail and I >ovulated during this cycle, will I still be more likely to get pregnant >if I skip this period? Do I need to have this period to ensure that any >failure because of the antibiotics is cleared away? Or does it not work >that way? Only one antibiotic (Rifampin, used for tuberculosis) is known to cause pill failure. Despite the "common wisdom" that other antibiotics do as well, it is simply not true. That being said, you may just skip the placebo pills of this cycle, and hopefully you will not have any bleeding, though it is possible that you will. -- William D. McIntosh, MD, FACOG This is for educational purposes only, and is not a substitute for consultation and examination by a licensed medical professional. Next message: William McIntosh, MD: "Re: Cervical Stenosis" Previous message: Tracy: "periods and spotting" In reply to: Jessica: "birth control pills, antibiotics, and missing a period"

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