A patient has been taking a drug for several years and tells the nurse it is no longer working.The nurse learns that the patient has recently begun taking an over-the-counter antacid medication.What does the nurse suspect is occurring?

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Drug interactions are an altered or modified action or effect of a drug as a result of interaction with one or more other drugs.An adverse drug reaction can occur with one or more drugs and has effects ranging from mild to severe toxicity.Drug incompatibility is a chemical reaction of two or more drugs that occurs in vitro.Drug tolerance is the development of reduced response to a medication over time.

A Patient Has Been Taking a Drug for Several Years