Laboratory test results indicate that warfarin anticoagulant therapy is suddenly ineffective in a patient who has been taking the drug for an extended time.The nurse suspects an interaction with herbal medications.What type of interaction does the nurse suspect?

Question

Quizplus · Accepted Answer

Antagonistic drug interaction occurs when one drug reduces or counteracts the effect of another, which could explain the sudden ineffectiveness of warfarin if the patient started taking an herbal medication that decreases warfarin's anticoagulant effect.

Laboratory Test Results Indicate That Warfarin Anticoagulant Therapy Is Suddenly