Isotretinoin pregnancy category X implies what?

• A. Only risk during the first trimester
• B. Contraindicated in pregnancy and can cause birth defects
• C. Safe in pregnancy with monitoring
• D. No risk

Answer: (B)

Isotretinoin is a highly teratogenic medication, so pregnancy category X means it is contraindicated in pregnancy because it can cause severe fetal birth defects. Category X indicates that fetal risk clearly outweighs any potential benefit, based on known data. Exposure at any point during pregnancy can lead to serious abnormalities—affecting the face, heart, brain, and other systems—making it unsafe to use while pregnant. Safety measures typically require effective contraception and pregnancy testing before and during treatment, and if pregnancy occurs, the medication is stopped promptly. In short, category X signifies no safe use in pregnancy due to the high risk of birth defects.