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i was just wondering if the mirena iud loses its effectivness when you are antibiotics like the pill does.

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According to this paper that I found (after searching for ages!), using analgesics, antibiotics, anti-inflammatories and anti-depressants have no statistically signficant correlation with IUD failure.

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So no, using antibiotics shouldn't cause the IUD to lose its effectiveness.

**edited by moderator**
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The reason oral contraceptives lose effectiveness during a course of antibiotics is because one of the side effects of antibiotics is to kill the "good" bacteria in your intestines that aid in digestion. Digestion is impaired, which is why you may experience diarrhea. Obviously if you aren't absorbing your food, you aren't absorbing the hormones in your pill either!



The hormones released by your Mirena IUD, on the other hand, are released directly into your uterus. What's going on in your intestine doesn't factor into that, of course.



That's the scientific explanation anyway, but all the usual disclaimers apply -- discuss this with your health care professional!
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That's not true. The reason antibiotics affect birth control, is because some antibiotics activate one of the enzymes that is responsible for drug metabolism. So you metabolize your birth control faster.
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Drug Interactions

Drugs or herbal products that induce enzymes, including CYP3A4, that metabolize progestins may decrease the serum concentrations of progestins.

Some drugs or herbal products that may decrease the serum concentration of levonorgestrel include:

barbituratesbosentancarbamazepinefelbamategriseofulvinoxcarbazepinephenytoinrifampinSt. John’s worttopiramate.

Significant changes (increase or decrease) in the serum concentrations of the progestin have been noted in some cases of co-administration with HIV protease inhibitors or with non-nucleoside reverse transcriptase inhibitors.

Consult the labeling of all concurrently used drugs to obtain further information about interactions with Mirena or the potential for enzyme alterations.


This is from the Mirana IUD Website. Thought it would be useful as some drugs CAN affect the IUD.

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But you don't metabolize Mirena! It is a LOCAL birth control (hormones released directly into the uterus). It is fine with antibiotics.
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