Can You Get Pregnant Taking Bactrim While On The Implanon And Having Unprotected Sex?

I took bactrim for a bladder infection on on the third day of the antibiotics I had unprotected sex with my husband. I have had the implanon since November 2010. What are the chances of the implanon becoming less effective while taking bactrim and is it possible that i could be pregnant? I don't get periods so i have no idea when my missed period would be.

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In a comparison of birth control methods in terms of effectiveness in preventing pregnancy, Implanon is actually one of the most effective forms of birth control currently available.

The failure rate for Implanon is about 0.0449%, as observed in the UK, where only 584 women have reported unwanted pregnancies out of 1.3 million who have used Implanon since 1999. So yes, it is possible to get pregnant, but very unlikely.

Keep in mind though that Bactrim is contraindicated in pregnant patients and nursing mothers, because sulfonamides pass the placenta and are excreted in the milk and may cause kernicterus (damage to the brain centers of infants).

I hope this info helps!

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