Which of the following medications is not typically used for hypertension in pregnant women?

The correct answer is the medication that is not typically used for managing hypertension in pregnant women—phenylephrine. While it can be used as a vasopressor to increase blood pressure in certain situations (such as during anesthesia), it is not approved for treating chronic hypertension or hypertension in pregnancy.

In contrast, methyldopa is widely regarded as a first-line treatment for hypertension during pregnancy due to its favorable safety profile. Labetalol is another effective option that is often preferred because it provides both alpha and beta-blockade, thereby effectively lowering blood pressure without significant risk to the fetus. Nifedipine, a calcium channel blocker, is also used in the management of hypertensive disorders in pregnancy, particularly for its rapid action and safety.

While all medications must be carefully considered and monitored during pregnancy, phenylephrine's primary use does not align with managing chronic hypertension in pregnant patients. Thus, it stands out as the option that does not conform to typical practices for treating elevated blood pressure in this population.