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A male asked:

Does macrobid decrease effectiness of alesse 21?

2 doctor answers4 doctors weighed in
Dr. Timothy Brown
Obstetrics and Gynecology 44 years experience
No: While many antibiotics affect the birth control pill, Macrobid (generic is nitrofurantoin) is specifically a urinary tract antibiotic and does not.
Dr. Norma jo Waxman
Family Medicine 33 years experience
No decreased effect: That is a great question, I’m impressed!! Few medications decrease the effectiveness of birth control pills (BCP). Many meds for seizures and one for HIV can decrease BCP effectiveness. The only antibiotic is uncommon, FRifampin, used to treat tuberculosis and serious fungal infections. St. John’s Wort, a “natural herb” for depression and anxiety, also makes the pill less affective
Dr. Timothy Brown
Obstetrics and Gynecology 44 years experience
Traditionally antibiotics have been considered to potentially interact with birth control pills, particularly tetracyclines and ampicillin. My admittedly non-scientific clinical impression is that breakthrough bleeding is more commonly encountered when antibiotics are involved. If there is more definitive information available I would appreciate the references
Oct 19, 2017

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Last updated Nov 28, 2017

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