Which of the following is a brand name for a vasoconstrictor?

Phenylephrine is a well-known vasoconstrictor that is often used in medical settings to raise blood pressure and reduce nasal congestion. It works by stimulating alpha-1 adrenergic receptors, leading to the constriction of blood vessels and subsequently increasing vascular resistance, which elevates blood pressure. This makes it particularly useful in situations like hypotension during anesthesia or in the treatment of certain types of shock.

Dobutamine, while important in cardiovascular medicine, primarily acts as a positive inotropic agent, increasing cardiac output without primarily causing vasoconstriction. Hydralazine is a vasodilator, used to lower blood pressure, and works by relaxing the smooth muscles of blood vessels. Captopril is an ACE inhibitor that primarily serves to lower blood pressure by preventing the formation of angiotensin II, a potent vasoconstrictor. Thus, none of these medications share the vasoconstrictive properties of phenylephrine.