Pharmacology Which of the following statements is not true for heparin – A Acts by activating anti-thrombin III B Protamine sulphate antagonizes its action C Requires aPTT monitoring in patient D Has only in vivo anticoagulant action 💡 Explanation Which of the following statements is not true for heparin - ✓ Correct Answer: D. Has only in vivo anticoagulant action