### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I am suffering from bone TB with infection and inflammation in my left sacral bone. The diagnosis was done after open biopsy. Therapy: Taking antibiotics from last two months. Started with Rifampicin, Isonizid, Pyrazinamide and Ethambutol. As the organism was found as fully sensitive/susceptible, Ethambutol was stopped after two weeks and the therapy continued with three medicines mentioned above. As, I have completed two months, now the plan is continue with Rifampicin and Isoniazid and stop Pyrazinamide. Observation: I felt a lot of improvement in the first two weeks of treatment but the condition detoriated rapidly after discontinuation of Ehambutol. Pain retuned back and much higher this time. However, new MRI and CT scan showed that the infection was not spreading. So, I was advised that the TB therapy is correct and I should continue with the three antibiotics. Now after completing two months of therapy, I am still in pain and way behind the improvment I was noticing after first two weeks of treatment. Bone abscess: Abscess is formed at the infection site, which is supposed to be treated by the immune system of my body and no external interference is done. Nerve involvement: I have severe pain and weakness in my left leg due to the pressure on the nerve roots caused by the inflammation at the infection site (left saclral bone). I took a lot of pain killers and was on a steroid (prednisone) course also for 20 days but pain and weakness returned back once I stopped taking the steroid. Can you please tell me whether the TB therapy is correct and how long will it take to get relief from pain? Also, how long the bone inflammation will last so that my nerve can get a relief and my left leg will feel better? Thanks a zillion in advance.

### output:

Hello. I appreciate the way you have explained your symptoms in detail, it is very helpful for a physician. The regimen for TB of the bone (whicChatDoctores under extrapulmonary TB) is 2 months of Isoniazid, Rifampicin, Pyrazinamide and Ethambutol. This is called the Intensive phase. This is later followed by the maintained phase of 4 months of Isoniazid and Rifampicin only. Total duration of therapy is 6 months. This is the regimen recommended by WHO in DOTS and is also followed in India where TB is very prevalent. We have observed very good results with this regimen in patients with bone TB. Though Ethambutol has side effects affecting the vision, we donor generally stop it only after 2 weeks. Even though it does not kill the TB bacteria but only stops it from multiplying, it is considered an important Chat Doctor.  Since it was stopped for you, I presume that it was according to the guidelines which are followed in your country. Generally, it would not be significant, but in the light of reappearance of your symptoms, I would consider it significant. Abscess which is formed due to TB bacteria is called a cold abscess as it does not have any active inflammation. It will gradually disappear with the same treatment. Surgical intervention like 