After a relapse of tuberculosis, it is usually necessary to take medication for more than nine months before cure is possible. It is recommended that the medication be taken without interruption, and that the lungs be examined on a regular basis, and that medical attention be sought in a timely manner if there is any abnormality. Recurrence of tuberculosis refers to the reinfection of tuberculosis after the initial cure. Common causes of recurrence of tuberculosis include insufficient initial treatment course and irregular use of medication. After a relapse of TB, medication should be taken for more than nine months, including a three-month intensive period and a six-month consolidation period, to help maintain the effectiveness of the treatment. During the period of relapse, isoniazid, rifampicin and ethambutol should be taken every day as part of a continuous treatment program, and should not be skipped during this period of time. In addition, regular lung examinations should be performed to monitor the effectiveness of the medication.