What is the most commonly used oral anticoagulant?
a. Acetylcholine esterase
b. Heparin
c. Streptokinase
d. Warfarin
ANS: D
The coumarin derivative, warfarin sodium, is the most commonly used oral anticoagulant. It must be given for 6 to 7 consecutive days to achieve a full antithrombotic effect. Warfarin should not be used solely for the initial management of venous thromboembolism because the peak effect is delayed for at least 72 to 96 hr.
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