Laboratory test results indicate that warfarin anticoagulant therapy is suddenly ineffective in a patient who has been taking the drug for an extended period of 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 opposes the effects of another, which could explain why warfarin's effectiveness is suddenly diminished, possibly due to an herbal medication that induces the enzymes metabolizing warfarin, leading to decreased warfarin levels and effect.

Laboratory Test Results Indicate That Warfarin Anticoagulant Therapy Is Suddenly