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Birth Control and antibiotics. Where is my period?

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Hello, I would really appreciate it if my question was answered, as I am curious as to what is happening.

At the end of the month of June I was diagnosed with Streptococci G, and began the antibiotic Azithromycin. While I was at the doctor, I asked her if this certain antibiotic would effect my birth control and she said no, only antibiotics ending with -cycline (tetracycline, etc.) were the main ones that effected birth control. I've been on the birth control Lo Estrin 24 Fe for the past year, and my boyfriend and I have unprotected sex regularly.

I will be taking my third placebo tonight and my withdrwal bleeding hasn't started yet. I've done some research, and found very little. Only positive information found was that some women don't even experience bleeding while taking Lo Estrin 24 Fe. As for the antibiotic interference, I wasn't able to find much information.

Pregnant? Where is my period? I would really like to hear back and see what you think doctor, thank you.

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replied July 9th, 2011
Birth Control Answer A24871
Welcome to ehealthforum,
Most antibiotics can affect the efficacy of the birth control. It is recommended to use additional protection while having intercourse when you are on these. Sometimes periods can get delayed due to stress also. Wait and watch for your periods. If you are not pregnant, they should start by the time you finish with taking the placebo pills. Some women can also have missed period while being on hormonal contraceptive pills. Wait and watch for your periods (you can also consider waiting and seeing in you get your next periods after your next pack of pill use). Do not start with your next pill pack if you suspect pregnancy. Visit your doctor/gynecologist back for further evaluation and assistance.
Take care.

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