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can SMZ/TMP DS 800-160 (antibiotics) interfere with Plan b one step?

By March 4, 2013 - 3:42am
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I posted a question earlier and explained my experience with plan b recently. I started reading up on how certain antibiotics can interefere with plan b. how long does it take for smz/tmp to leave yoyr system? I stopped using it on the 15th and then used plan b on the 18th. please help. will plan b be affected even though I stopped using the antibiotic a few daysbbefore? I still meed to take a pregnancy test.

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Hi Balcatraz,

As a precaution to avoid pregnancy, an alternate form of birth control should be used while on antibiotics and two weeks after. If you think that Plan B may have been ineffective, please test for pregnancy if your next period is more than one week late.

Best of luck,


March 4, 2013 - 6:06am
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