Pharmacology Which of the following is true of propylthiouracil? A It is used in the treatment of myxedema B It has a long half-life in the circulation C It increases proteolysis of thyroglobulin D It blocks thyroxine synthesis 💡 Explanation Which of the following is true of propylthiouracil? ✓ Correct Answer: D. It blocks thyroxine synthesis