A nurse is teaching a client who has tuberculosis and is to start medication therapy with isoniazid, rifampin and pyrazinamide. Which of the following instructions should the nurse include?

A. "Take isoniazid with an antacid.": Isoniazid should not be taken with an antacid. Antacids containing aluminium, calcium, or magnesium can reduce the absorption of isoniazid, making it less effective. Isoniazid is typically taken on an empty stomach for better absorption. B. "Drink at least 8 ounces of water when you take the pyrazinamide tablet.": While it is generally good practice to take medications with water, this instruction is not specific to pyrazinamide. C. "Expect your sputum cultures to be negative after 6 months of therapy.": Sputum cultures may not be negative after 6 months of therapy. Although treatment with isoniazid, rifampin, and pyrazinamide is typically effective, sputum cultures may remain positive for several months during treatment depending on severity and response to treatment. D. "Provide a sputum specimen every 2 weeks to the clinic for testing.": Regular sputum specimens are required to monitor the effectiveness of tuberculosis treatment. Providing a sputum sample every 2 weeks is done to ensure the bacteria are being effectively eliminated and to monitor for drug resistance.