Category X teratogens are defined as?

Category X teratogens are defined as?

• A. There is positive evidence of fetal risk based on human data; benefits may warrant use.
• B. There is no risk in pregnancy.
• C. There is evidence of risk but benefits outweigh.
• D. Studies in animals or humans have demonstrated fetal abnormalities and/or there is positive evidence of human fetal risk; the risks clearly outweigh potential benefits.

Answer: (D)

Category X refers to the highest level of fetal risk a drug can have, such that its use in pregnancy is contraindicated. It means there is positive evidence from animal studies or human data that the drug causes fetal abnormalities or other serious fetal harm, and the risks clearly outweigh any potential benefit. In practice, this category is reserved for drugs where there is no acceptable risk to the fetus, so they should be avoided in pregnancy and, ideally, avoided by anyone who could become pregnant. Other categories describe lesser or uncertain risk or potential benefits that could justify use in some situations, which is why they are not Category X.

Category X refers to the highest level of fetal risk a drug can have, such that its use in pregnancy is contraindicated. It means there is positive evidence from animal studies or human data that the drug causes fetal abnormalities or other serious fetal harm, and the risks clearly outweigh any potential benefit. In practice, this category is reserved for drugs where there is no acceptable risk to the fetus, so they should be avoided in pregnancy and, ideally, avoided by anyone who could become pregnant. Other categories describe lesser or uncertain risk or potential benefits that could justify use in some situations, which is why they are not Category X.