Skip to main contentLast updated: 08-Nov-2026
Dr Harsh Shah
MS, MCh (Surgical Gastroenterology), DrNB (Surgical Gastroenterology)
Registered with Gujarat Medical Council, Reg. No. G-38738
Gastro & Cancer Surgeon
Dr. Jivraj Mehta Hospital, Vasna, Ahmedabad · 18 years of experience
In short
Intestinal TB is mainly a disease for tablets, not for a knife. The usual course is six months: four medicines for two months, then two medicines for four months.
A longer course of nine months or more is not needed as a routine. Blood tests for the liver are done before and during the course.
The belly can feel worse for a while even when the medicine works. An operation is only for scarred narrowings, holes in the bowel and bleeding.
This post is about the medicines. For the whole picture of bowel TB, from tests to surgery, see our intestinal tuberculosis treatment page.
The standard course is six months. For two months you take four medicines, and for the next four months you take two.
Older practice stretched the course to nine, twelve or even eighteen months. A trial in people with bowel TB compared six months with nine and found no real gain from the longer course. So six months is the plan, unless there is a clear reason to go longer. Poor response despite regular tablets, very extensive disease and long gaps in treatment are such reasons.
In India, the tablets are taken daily as a combination pack, and the dose depends on body weight. They are given through the national TB programme at no cost to the patient. Please take them every day. Missed doses are how TB becomes harder to treat.
| Phase | Length | Medicines | What the phase does |
|---|---|---|---|
| First phase | 2 months | Isoniazid, rifampicin, pyrazinamide, ethambutol | Kills most germs fast and stops resistance |
| Second phase | 4 months | Isoniazid, rifampicin | Clears the germs that remain and prevents a relapse |
| Whole course | 6 months | As above | Standard course when the germ is sensitive to these medicines |
Each medicine kills the germ in its own way, and each has one side effect worth knowing. The liver is the main thing we watch.
Isoniazid, rifampicin and pyrazinamide can all irritate the liver. This is more likely in people who are thin, drink alcohol or already have liver disease. So a liver blood test is done before the course and again during it. Yellow eyes, dark urine or repeated vomiting are reasons to call your doctor the same day. Do not wait for the next visit.
Tell your doctor about every other medicine you take. This includes diabetes tablets, blood thinners, contraceptive pills and HIV medicines. Rifampicin can weaken some of them. If a stool or tissue test shows the germ is resistant to rifampicin, the standard course is not used. A separate programme for drug-resistant TB takes over.
Feeling worse early does not always mean the medicine has failed. Two things can happen even when treatment is working.
The first is a paradoxical reaction. The body’s defence wakes up as the germs die, and fever, pain or swollen glands can flare for a few weeks. The right step is to keep taking the tablets and to tell your doctor. Stopping them, or jumping to the idea of resistant TB, is the usual mistake.
The second is a new narrowing. TB ulcers heal by scarring, and a scar can tighten the bowel. Colicky pain after meals, swelling and vomiting then appear while the infection itself is clearing. This is a problem of the passage, and more tablets will not fix it. Our post on a blocked bowel from intestinal TB explains what happens next.
Feeling better is a good sign, but the firm proof is a repeat colonoscopy after two to three months. It shows whether the ulcers have healed.
Some people feel well while ulcers remain. Others have healed ulcers but still have symptoms because of a scar. Looking inside settles both questions. The same test helps when the first diagnosis was uncertain, because TB and Crohn disease can look alike. If the ulcers do not heal on proper treatment, we think again about the diagnosis. Our Crohn disease treatment page explains the other condition.
Surgery is for what tablets cannot undo. That means a scarred narrowing, a hole in the bowel, bleeding that will not stop, or a complete blockage.
Tablets calm inflammation, but they cannot dissolve an old scar. If the bowel stays tight after the infection has settled, a balloon stretch or an operation opens the passage. A hole or a complete blockage is an emergency, and we do not delay it to finish the course first.
The TB medicines continue after any operation, because the infection still needs to be treated. When the gut is badly diseased, tablets may not be absorbed well, and we adjust the plan. Dr Harsh Shah works with your physician or TB doctor and does not take over the TB tablets. We see you when narrowing, pain or vomiting suggests a mechanical problem. Please bring the following:
The usual course is six months. Four medicines are taken for two months and then two medicines for four months. A longer course is only for a clear reason.
No. A trial in intestinal TB found no real gain from nine months over six. A longer course adds side effects, so it is not used as a routine.
Yellow eyes, dark urine, repeated vomiting, numb hands or feet, and blurred vision. Orange urine from rifampicin is harmless.
Fever or pain can flare for a few weeks as the germs die. This is called a paradoxical reaction. Keep taking the tablets and tell your doctor.
No. Tablets calm active inflammation, but an old scar stays. A scarred narrowing needs a balloon stretch or an operation, even if the infection has cleared.
No. Tablets continue before and after the operation. In an emergency, surgery comes first and the tablets are restarted as soon as you are stable.
By symptoms, weight and, most reliably, a repeat colonoscopy after two to three months that shows healed ulcers.
A physician or the TB programme prescribes the tablets. A surgeon is needed when there is a narrowing, a hole, bleeding or a lump that needs an operation.
For questions before you travel, call +91-63555-64601. The pages below cover the next steps.
Dr Harsh Shah — Dr. Jivraj Mehta Hospital, Vasna, Ahmedabad
Dr. Jivraj Mehta Hospital, Dr Jivraj Mehta Marg, Vasna, Ahmedabad 380007.
Consultations, review of reports and scans, operations and follow-up. OPD Monday to Saturday, 9 am to 5 pm.
Appointments: +91-63555-64601 · +91-63590-11009 · Hospital 079-2663 6363
Directions to the hospital · WhatsApp +91-63555-64601
Told you have TB of the bowel, or already on TB tablets and worried about them? The course is long, the tablets have side effects, and the belly can feel odd in the first weeks. Dr Harsh Shah is a surgeon, and he works alongside your TB doctor. He reads your reports and tells you plainly what to expect, and when an operation would be needed. Call, or message us on WhatsApp. Call For Appointment Book on WhatsApp Tapping Book on WhatsApp will likely open the WhatsApp app on your phone.
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