A nurse is providing teaching to a client who has a new prescription for disulfiram for alcohol use disorder. Which of the following instructions should the nurse include?

The correct answer is A: Avoid all products containing alcohol, including mouthwash. This is crucial because disulfiram causes a severe reaction when alcohol is consumed, leading to unpleasant symptoms like nausea, vomiting, headache, and flushing. By avoiding all alcohol-containing products, the client can prevent these adverse reactions and support their treatment for alcohol use disorder effectively. Taking the medication in the morning (B) or experiencing a metallic taste (C) are not directly related to the mechanism of disulfiram. Discontinuing the medication if drinking resumes (D) is incorrect as the medication should be continued to deter alcohol consumption.