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A member asked:

Does bactrim (sulfamethoxazole and trimethoprim) decrease the effectiveness of quartette birth control?

2 doctors weighed in across 2 answers
Dr. Lori Semel answered

Specializes in Pediatrics

Antibiotics and bc: Rifampin is the only antibiotic that decreases the effectiveness of birth control. Bactrim (sulfamethoxazole and trimethoprim) does not.

Answered 8/1/2014

3.8k views

Thank
Dr. Nayana Trivedi answered

Specializes in Internal Medicine

Yes: Some of the Antibiotics do lower the efficacy of Birth Control pills , so you may want to use extra protection like Barrier methods during this period.

Answered 1/21/2019

3.8k views

Thank

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Does bactrim (sulfamethoxazole and trimethoprim) increase chances of getting pregnant if not on birth control?

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