Propranolol has a notable use in the prophylaxis of esophageal variceal bleeding due to what effect?

• A. Essential tremor
• B. Migraine prophylaxis
• C. Esophageal varices prophylaxis
• D. Akathisia

Answer: (C)

Lowering portal venous pressure is the key to preventing esophageal variceal bleeding in portal hypertension. Propranolol is a nonselective beta-blocker, and its protective effect comes from reducing portal inflow to the liver. It does this primarily by causing splanchnic vasoconstriction through beta-2 blockade (which leaves unopposed alpha-adrenergic activity). The result is decreased splanchnic blood flow, and it’s complemented by a reduction in cardiac output from beta-1 blockade. The net effect is a drop in portal venous pressure, which lowers the tension on varices and reduces the risk of bleeding. This is the notable use of propranolol in this context, unlike its other indications such as essential tremor, migraine prophylaxis, or akathisia.