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Pharmacology · single question

What is the mechanism of action of propranolol?

  1. Selective beta-1 blocker
  2. Non-selective beta (beta-1 and beta-2) blocker
  3. Alpha-1 blocker
  4. ACE inhibitor
Show answer and explanation

Correct answer: B. Non-selective beta (beta-1 and beta-2) blocker

  • A. Selective beta-1 blockade describes atenolol/metoprolol.
  • B. Correct. Propranolol is a non-selective beta-blocker (beta-1 and beta-2); caution in asthma due to beta-2 blockade.
  • C. Alpha blockade is a different class.
  • D. ACE inhibition is unrelated to propranolol.

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