Final answer:
PTU can cross the placenta and affect the developing fetus. It is generally considered safe to use during pregnancy but should be closely monitored for potential risks and birth defects.
Step-by-step explanation:
Propylthiouracil (PTU) is a medication used to treat hyperthyroidism, which is an overactive thyroid gland. When it comes to pregnancy, it is important to remember that PTU can cross the placenta and affect the developing fetus. While PTU is generally considered safe to use during pregnancy, it can increase the risk of certain birth defects such as choanal atresia and aplasia cutis congenita.
Therefore, it is recommended that pregnant women taking PTU should be closely monitored by their healthcare provider to ensure proper dosage and to assess any potential risks to the fetus.