Teratogenic drugs are defined as which?

• A. Drugs that cause birth defects
• B. Drugs that treat infections
• C. Drugs that relieve pain
• D. Drugs that prevent pregnancy

Answer: (A)

Teratogenic means a drug has the potential to cause birth defects in a developing fetus when the mother is exposed during pregnancy. The fetus is especially vulnerable during early organ formation, so certain medications can disrupt development and lead to congenital anomalies or growth and neurodevelopmental problems. Because of this specific risk, teratogenic drugs are defined by their ability to cause birth defects, not by what the drug is generally used to treat or do. For example, some medications known to be teratogenic can cause severe birth defects if taken during pregnancy, highlighting why exposure timing matters.