your best bet for a good answer to this question is to consult your pharmacist. that said we usually tell women taking oral birth control pills to use secondary birth control (such as a condom) when taking any antibiotic (such as bactrim) because some antibiotics may reduce the effectiveness of birth control pills. bottom line: if you don't know for sure if a particular drug is interfering with your birth control pills always use a back-up solution. hope this helps!
does bactrim interfere with or reduce the effectiveness of yaz (birth control) to prevent pregnancy?