Final answer:
The nurse should include information about the correct dosage and frequency of the tuberculosis medications.
Step-by-step explanation:
The most important medication information for the nurse to include when educating a client diagnosed with tuberculosis is the correct dosage and frequency of the medications. In this case, the nurse should inform the client about taking isoniazid and rifampin three times a day for at least three months. The nurse should emphasize the importance of taking the medications as prescribed to ensure effective treatment and prevent the development of drug resistance.