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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Does Taking Flagyl Reduce The Efficacy Of Birth Control Pills?

Yes, I have a question concerning birth control. I am currently on trinessa and have been for a couple of years. A few weeks ago I was on flagyl for bacterial vaginosis. I continued to take my birth control throughout at the same time every day and did not miss a pill. 11 days after I was off the antibiotics I did have sexual intercourse. Like I said, I continued to take my birth control as normal, and he withdrew before ejaculating. I also had been off the antibiotic for over a week. I am just concerned on my risk of pregnancy.
Mon, 11 Sep 2017
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General & Family Physician,  's  Response
Hi dear. Thanks for trusting HCM. I have gone through your questions and understood your query.

Firstly, trinessa contains contraceptive hormones norgestimate and ethinyl estradiol to prevent pregnancy. While flagyl is a brand for metronidazole, antibiotic for treating bacterial infection.

There's interaction when using trinessa and flagyl together. Flagyl will decrease the level or effects of ethinyl estradiol (female hormone in trinessa) by altering the intestinal/digestive flora, it applies for stomach infection. While on vaginosis bacterialis, it showed only low risk of contraceptive failure. Nevertheless, the use better should monitor closely. You can check with pregnancy test pack if there's delay period.

I hope this can be useful for your concerns to reduce your worries. If there's anything else you need to know, feel free to discuss it with me in HealthCareMagic. Take care.

Best regards,
dr. Asti Yuliadha
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Does Taking Flagyl Reduce The Efficacy Of Birth Control Pills?

Hi dear. Thanks for trusting HCM. I have gone through your questions and understood your query. Firstly, trinessa contains contraceptive hormones norgestimate and ethinyl estradiol to prevent pregnancy. While flagyl is a brand for metronidazole, antibiotic for treating bacterial infection. There s interaction when using trinessa and flagyl together. Flagyl will decrease the level or effects of ethinyl estradiol (female hormone in trinessa) by altering the intestinal/digestive flora, it applies for stomach infection. While on vaginosis bacterialis, it showed only low risk of contraceptive failure. Nevertheless, the use better should monitor closely. You can check with pregnancy test pack if there s delay period. I hope this can be useful for your concerns to reduce your worries. If there s anything else you need to know, feel free to discuss it with me in HealthCareMagic. Take care. Best regards, dr. Asti Yuliadha