The FDA has dictated a code of federal registry that delineates five categories of the relative safety of drugs when used during pregnancy. (Section 201.57 of the federal drug registry.) Pregnancy Class X means that studies in animals and in humans demonstrate fetal risk such that the potential benefits of taking the drug could not possibly outweigh the risks. Also, drugs that would not normally be taken during pregnancy, such as all contraceptive products, fall within this category, even though the data for those drugs may not indicate a risk during pregnancy. Accutane, Danazol, and Clomiphene Citrate are considered Class X medications.
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