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Pharmacology · single question

What is the mechanism of action of atenolol?

  1. Increase cardiac output
  2. Decrease cardiac output
  3. Increase vascular resistance
  4. Decrease vascular resistance by arterial dilation
Show answer and explanation

Correct answer: B. Decrease cardiac output

Atenolol is a cardioselective ╬▓1 antagonist. By blocking ╬▓1 receptors in the heart, it decreases heart rate and contractility, thereby decreasing cardiac output and lowering blood pressure. It is used for hypertension, angina, and post-MI.

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