Which statement describes Category A teratogens?

Which statement describes Category A teratogens?

• A. Adequate, well-controlled studies in pregnant women have not shown an increased risk of fetal abnormalities
• B. There is positive human fetal risk with possible benefits
• C. Animal studies show harm but human data is lacking
• D. There is clear fetal harm in both animals and humans

Answer: (A)

Category A refers to drugs for which well-controlled studies in pregnant women show no increase in fetal risk in any trimester. This is the strongest human-data indication of safety during pregnancy, so the statement that adequately controlled studies in pregnant women have not shown an increased risk of fetal abnormalities is the best description of Category A teratogens. The other statements describe different risk categories: positive human fetal risk with possible benefits aligns with categories where risk has been demonstrated (often labeled as D), animal data showing harm but no human data fits Category C, and clear fetal harm in both animals and humans corresponds to Category X.

Category A refers to drugs for which well-controlled studies in pregnant women show no increase in fetal risk in any trimester. This is the strongest human-data indication of safety during pregnancy, so the statement that adequately controlled studies in pregnant women have not shown an increased risk of fetal abnormalities is the best description of Category A teratogens. The other statements describe different risk categories: positive human fetal risk with possible benefits aligns with categories where risk has been demonstrated (often labeled as D), animal data showing harm but no human data fits Category C, and clear fetal harm in both animals and humans corresponds to Category X.