Which antibiotics affect birth control pills?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Do antibiotics affect birth control? In most cases, no. The majority of antibiotics do not reduce the effectiveness of birth control pills. The main exception is rifampin (and related drugs like rifabutin), used to treat tuberculosis, which can lower hormone levels and make oral contraceptives less reliable. Common antibiotics like amoxicillin, penicillin, and doxycycline are considered safe to take with birth control.

If you're unsure how a medication may be affecting your body or you're experiencing unexpected symptoms, don't guess—get clarity. A free, instant, online symptom check can help you understand what might be going on and guide you toward the right next steps, whether that's reassurance, self-care, or seeing a doctor. It takes just a few minutes and could save you hours of worry.

Reviewed for medical accuracy: 07/20/2026

Important Next Steps

Learn if antibiotics reduce pill protection Discover why your birth control may fail Find out if you need care today See OTC options for antibiotic side effects Find doctors for birth control concerns Understand home remedies for pill upset Check if antibiotic use means pregnancy risk

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Explanation

When it comes to birth control pills and antibiotics, most antibiotics do not interfere with the effectiveness of birth control pills. However, there is one exception: rifampin. Rifampin is an antibiotic used to treat certain bacterial infections, and it can make birth control pills less effective.

Key Points:

Rifampin: This antibiotic can lower the effectiveness of birth control pills, which means there is a higher chance of pregnancy if you are using birth control pills while taking rifampin.
Other Antibiotics: According to the studies, other common antibiotics do not have the same effect as rifampin. Most antibiotics will not change how well birth control pills work.

If you are prescribed rifampin or have concerns about your birth control and any medications you are taking, you can use Ubie's free AI-powered symptom checker to better understand your symptoms and medication interactions before speaking with your healthcare provider. They can give you advice on how to manage your medications to maintain the effectiveness of your birth control.

(References)

Simmons KB, Haddad LB, Nanda K, & Curtis KM. (2018). Drug interactions between non-rifamycin antibiotics and .... American journal of obstetrics and gynecology, 28694152.
Archer JS, & Archer DF. (2002). Oral contraceptive efficacy and antibiotic interaction: a myth .... Journal of the American Academy of Dermatology, 12063491.
Dickinson BD, Altman RD, Nielsen NH, Sterling ML, & Council on Scientific Affairs, American Medical Association. (2001). Drug interactions between oral contraceptives and antibiotics. Obstetrics and gynecology, 11704183.

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