Tuberculosis is treated with a combination of antibiotics taken for several months. For standard, drug-susceptible TB in adults, the latest CDC guidelines recommend a total of four months of treatment: two months on four medications, followed by two months on a smaller combination. Finishing the full course is critical, even after symptoms improve, because stopping early allows surviving bacteria to multiply and potentially develop drug resistance.
Active TB Treatment in Adults
The current CDC-recommended regimen for adults and adolescents aged 12 and older is a four-month course. During the first two months (the intensive phase), you take four medications daily. During the final two months (the continuation phase), you take three. This is a significant change from the older six-month standard and reflects updated 2025 guidelines that incorporate newer antibiotics to shorten treatment.
The medications work differently from each other: some kill actively growing bacteria, others target dormant bacteria hiding in your tissues, and others prevent resistance from developing. That’s why multiple drugs are always used together. You’ll never be prescribed just one antibiotic for active TB.
For children between 3 months and 16 years old with non-severe lung TB, the regimen uses a slightly different drug combination but follows the same two-phase structure over four months. Children’s doses are calculated by weight, and child-friendly formulations (fruit-flavored tablets that dissolve in liquid) have been available since 2015 to make the process easier for younger kids.
What Latent TB Treatment Looks Like
If you’ve been infected with TB bacteria but don’t have symptoms or active disease, you have latent TB. Treating it prevents the infection from becoming active later, which happens in about 5 to 10 percent of untreated cases over a lifetime. The CDC now recommends shorter treatment courses over the older approach of taking a single medication for six to nine months.
The preferred options are:
- 3 months of two medications taken once weekly. This is the shortest option and requires only 12 total doses.
- 4 months of a single daily medication. This adds up to 120 doses.
- 3 months of two medications taken daily. A total of 90 doses.
These shorter regimens are equally effective and have significantly higher completion rates than the older six- or nine-month options. The longer courses (daily medication for six or nine months) are still available as alternatives when the shorter regimens can’t be used, often because of drug interactions with other medications you’re taking.
TB in the Brain, Bones, and Other Sites
TB doesn’t only affect the lungs. When it appears in other parts of the body (called extrapulmonary TB), the same core medications are used. Most extrapulmonary TB responds to a standard six-month regimen. However, two forms typically require longer treatment: TB in the central nervous system (especially TB meningitis) and TB in the bones or joints. Both are generally treated for 9 to 12 months because of the difficulty in assessing whether the infection has truly cleared and the serious risks of undertreating these locations.
Drug-Resistant TB
When TB bacteria are resistant to the two most important first-line drugs, the condition is classified as multidrug-resistant TB (MDR-TB). Treatment becomes significantly more complex and longer, often lasting 9 to 18 months or more depending on the resistance pattern. The specific drugs used are different from standard treatment, and your care team will tailor the regimen based on laboratory testing that shows which medications the bacteria still respond to.
Drug resistance most commonly develops when people don’t finish their full treatment course, take medications irregularly, or receive an inadequate regimen. This is one of the main reasons completing every dose matters so much.
Staying on Track With Treatment
TB treatment works, but only if you take every dose on schedule. A strategy called Directly Observed Therapy (DOT) was designed to help with this: a healthcare worker watches you take each dose, either in person or via video. Between 2015 and 2022, DOT achieved an 82% treatment success rate compared to about 72% for people managing their medications on their own. The benefits were especially clear for people experiencing homelessness and those living with HIV.
That said, DOT isn’t the only path to success. What matters is having a system, whether that’s DOT, video check-ins, or another support structure, that helps you stay consistent for the full treatment duration. Missing doses or stopping early is the single biggest risk factor for treatment failure and drug resistance.
Side Effects to Watch For
TB medications are hard on the liver. The most important warning signs to know are loss of appetite, nausea or vomiting, dark brown urine, light-colored stool, and yellowing of the skin or eyes. Any of these could signal liver toxicity, which is the most serious potential side effect. If you notice them, stop your medication and contact your provider immediately for blood testing.
Other side effects to report include:
- Tingling, numbness, or burning in your hands or feet. This nerve irritation is a known effect of one of the core medications and can often be managed with vitamin B6 supplements.
- Blurred or changed vision, including altered color perception. One of the medications used in the intensive phase can affect the eyes, so any vision changes need prompt evaluation.
- Unexplained rash, easy bruising, or persistent fever. These can indicate an allergic reaction or blood cell changes.
You’ll have check-ins at least monthly throughout treatment. The type and frequency of monitoring depends on your age, whether you drink alcohol, and other health conditions. Your provider will ask about side effects at each visit and may order blood work to check liver function, particularly in the early weeks.
TB and HIV Together
People living with HIV face a much higher risk of developing active TB, and treating both infections at the same time requires careful coordination. If you’re diagnosed with TB and aren’t yet on HIV treatment, the timing of starting antiretroviral therapy depends on how suppressed your immune system is. People with very low immune cell counts should begin HIV treatment within two weeks of starting TB medications. Those with stronger immune function typically start HIV therapy within 8 to 12 weeks. The one exception is TB meningitis, where HIV treatment is delayed for at least eight weeks to reduce the risk of dangerous inflammation in the brain.
Nutrition During Treatment
TB and its treatment can take a toll on your weight and energy levels. Despite this, there’s currently no strong evidence that routine vitamin or mineral supplements above normal daily amounts improve treatment outcomes. The WHO does not recommend megadose supplements for TB patients as standard practice.
Where nutrition support does matter is for people who are already underweight or losing weight during treatment. If you haven’t regained a healthy weight after two months of TB treatment, that’s a signal to investigate further. It could mean the medications aren’t being absorbed properly, there’s a coinfection, or you need additional calorie-dense and nutrient-rich foods. Pregnant women with active TB should take a daily prenatal multivitamin containing iron and folic acid, and children under five who are underweight should receive supplementary feeding according to standard malnutrition guidelines.
The practical takeaway: eat well and maintain your calorie intake during treatment, but don’t expect supplements alone to speed your recovery. Consistent medication adherence matters far more than any dietary intervention.