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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Taking Microgynon, Prescribed Trimethoprim For Bladder Infection. Will Antibiotic Affect The Efficacy Of Pill?

I am taking Microgynon 30 and have been prescribed Trimethoprim from a bladder infection . My doctor told me to use additional protection during the course of antibiotics and a week after that. However, it says on the Internet that these two medications don t conflict - will the antibiotic affect the pill and can I get pregnant if I have sex on the pill in the next 12 days?
Mon, 24 Sep 2012
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General & Family Physician,  's  Response
Hi,
There is no mentioned interaction of Trimethoprim with the Microgynon which is an OCP documented till now. Trimethoprim is a common drug used for the treatment of UTI. So when there is no interaction than chances of contraceptive failure is not there and if you are taking the OCP regularly than chances of being pregnant is as low as with the failure rate of OCP. This is there when you are taking only there drugs and no other medication. Your doctor may have instructed you because many antibiotics have interaction with OCP and can lead to pregnancy.
Thanks and take care
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Taking Microgynon, Prescribed Trimethoprim For Bladder Infection. Will Antibiotic Affect The Efficacy Of Pill?

Hi, There is no mentioned interaction of Trimethoprim with the Microgynon which is an OCP documented till now. Trimethoprim is a common drug used for the treatment of UTI. So when there is no interaction than chances of contraceptive failure is not there and if you are taking the OCP regularly than chances of being pregnant is as low as with the failure rate of OCP. This is there when you are taking only there drugs and no other medication. Your doctor may have instructed you because many antibiotics have interaction with OCP and can lead to pregnancy. Thanks and take care