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Drugs used in pregnancy

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I'am 13 weeks pregnant, my doc has prescribed me the nitrofurantoin for urine tract infection, but i don't feel confortble taking it because i'am affraid it can harm the baby.I saw that it is "probably" safe to use while pregant and also that some woman had lost the pregnancy because of it, I'am waiting for the culture exam from lab this monday, right now, is not that bad but i feel unconfortble, i'am taking yogurt, cranberry juice and a lots of water that helped, I don't know what to do and would like some advise please! :)
We whent trough a lot going trough the fertility treatment this is our third time and Thank God that it worked and I just want to be safe and not do anything wrong, and for me to get pregnant ivf is the only way out.
I don't know about this medication and i'am very concerned about taking it???????? PLease help me!!!!

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First Helper tjackson224

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replied January 26th, 2009
Pregnancy Answer A5514
Current medical status: 3 months pregnant trhough fertility treatment
Current medical treatment: nitrofurantoin mono/mac 100 mg caps for urine tract infection

Nitrofurantoin is classified as a pregnancy category B agent, which means that animal reproduction studies have failed to demonstrate a risk to the fetus and there are no adequate and well-controlled studies in pregnant women OR Animal studies have shown an adverse effect, but adequate and well-controlled studies in pregnant women have failed to demonstrate a risk to the fetus in any trimester.

Medicine groups that are widely used in pregnancy include: penicillin, erythromycin, cephalosporin (1st and 2ng generation only) and nitrofurantoin. There are recommendations that each of these medications should be used only if the benefit for the mother is bigger than the potential risk.

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