The FDA uses a pregnancy category system to classify the possible risks to a fetus when a specific medicine is taken during pregnancy. Pregnancy Category B is given to medicines that have not been adequately studied in pregnant humans but do not appear to cause harm to the fetus in animal studies.
Flagyl crosses the placenta. In general, animal studies have failed to show that the drug causes problems during pregnancy. Surveys and other similar types of studies in humans seem to suggest that Flagyl probably does not cause birth defects.
There is some concern that exposure to Flagyl during pregnancy might increase the risk of childhood (or even adult) cancers. Flagyl increases the risk of certain cancers in mice and rats; it is unknown if the same is true for humans. Studies have failed to consistently show that Flagyl exposure does (or does not) increase the risk of childhood cancers.
However, it is important to note that animals do not always respond to medicines the same way that humans do. Therefore, a pregnancy Category B medicine should be given to a pregnant woman only if a doc believes that the benefits to the pregnant woman outweigh any possible risks to the unborn child. Because of the possible risks, Flagyl is not recommended for treating trichomoniasis or bacterial vaginosis during the first trimester of pregnancy. If no other alternatives are available, Flagyl may be used to treat other types of infections if necessary (if the infection is very serious).
However, best would be to ask your gynecologist for details, take care, best wishes!
- Flagyl Information for Consumers
- Flagyl Information for Healthcare Professionals (includes dosage details)
- Side Effects of Flagyl (detailed)
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