Pharmacology All of the following statements about unfractionated heparin are true except:- A It is a powerful anticoagulant only in vivo B Protamine sulfate is the antidote C It should not be given by intramuscular route D It acts by inhibiting factor IIa and Xa 💡 Explanation All of the following statements about unfractionated heparin are true except:- ✓ Correct Answer: A. It is a powerful anticoagulant only in vivo