Which antihypertensive is commonly administered intravenously during pregnancy?

• A. Methyldopa
• B. Hydralazine
• C. Nifedipine
• D. Enalapril

Answer: (B)

Hydralazine is commonly administered intravenously during pregnancy, particularly in cases of severe hypertension or hypertension in labor. This medication is a direct vasodilator that works by relaxing the smooth muscles in blood vessels, leading to a decrease in blood pressure. It is often used for acute management because it can be given quickly and allows for a prompt effect, which is crucial in a clinical setting where rapid response to high blood pressure is necessary to protect both the mother and the fetus.

The other options, while they may play roles in managing hypertension in pregnancy, are not typically administered intravenously in an acute setting. Methyldopa and nifedipine are generally used in oral forms for managing chronic hypertension during pregnancy. Enalapril, an ACE inhibitor, is usually avoided due to potential adverse effects on the fetus and is not commonly used in pregnancy at all. Therefore, hydralazine stands out as the correct choice for intravenous use in this context.