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 she suspect?

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In an antagonistic drug interaction,one drug interferes with the actions of another and decreases the resultant drug effect.In a synergistic drug interaction,there is an additive effect; that is,the effects of both drugs combined are greater than the individual effects.An idiosyncratic reaction is an unexpected,abnormal,or peculiar response to a medication.Drug incompatibilities occur when drugs are physically mixed together,causing a chemical deterioration of one or both drugs.

Laboratory Test Results Indicate That Warfarin Anticoagulant Therapy Is Suddenly