A nurse is teaching a client who has a new prescription for isoniazid to treat tuberculosis. Which of the following information should the nurse include in the teaching?

The correct answer is A. The nurse should include information about the need for frequent sputum tests to monitor the effectiveness of isoniazid in treating tuberculosis. This is crucial because monitoring sputum tests helps assess the response to the medication and the progression of the disease. Choices B, C, and D are incorrect. B is incorrect because isoniazid treatment for tuberculosis typically lasts for several months, not just one month. C is incorrect because isoniazid absorption can be affected by antacids containing aluminum, so they should not be taken together. D is incorrect because constipation is not a common side effect of isoniazid.