The nurse performs a medication history on a patient who will begin targeted therapy for cancer with gefitinib (Iressa).The nurse learns that the patient is taking carbamazepine,a histamine₂blocker,and warfarin.The nurse will anticipate that the provider will make which change to the medication regimen?

Question

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When patients taking warfarin take gefitinib,the effectiveness of the warfarin is greatly increased,and bleeding risks increase.Carbamazepine and histamine₂ blockers decrease the effectiveness of gefitinib,so decreasing the gefitinib dose or decreasing the carbamazepine or histamine₂ blocker is not recommended.

The Nurse Performs a Medication History on a Patient Who