Why are certain medications contraindicated in pregnant women?

Certain medications are contraindicated in pregnant women primarily because they can harm fetal development or cause complications during pregnancy. During gestation, the developing fetus is particularly vulnerable to the effects of drugs, which can interfere with natural development processes. Some medications may cross the placental barrier and affect the fetus directly, leading to teratogenic effects or other harmful outcomes such as preterm labor, miscarriage, or congenital anomalies.

The decision to contraindicate specific medications for pregnant women is grounded in a thorough understanding of the potential risks versus benefits. While some medications might be safe for the general population, their safety profile changes significantly when considering pregnancy and the unique physiological changes that occur in the body. Therefore, it's crucial for healthcare providers to carefully assess the medication history and current needs of pregnant patients to prevent any adverse effects on fetal health.