Tuberculosis Medications

No, recovering from active TB without medication cannot be counted on, and untreated TB disease can be fatal. WHO wrote in 2026 that TB disease can be fatal without treatment, and that TB is preventable and curable. Inactive TB causes no illness, yet CDC rated its treatment in 2025 at about 90% effective against active disease. CDC also said in 2025 that about 1 in 10 people with untreated inactive TB later get sick with active TB. Before antibiotics, Danish doctors gave gold salts from the mid-1920s; in guinea pig experiments they showed no convincing effect (Norn, 2011).

Rifampin is the drug most TB regimens are built around. Its uses, dose and warnings are covered on the page for rifampin.

The four main TB medications are rifampin, isoniazid, pyrazinamide and ethambutol, known together as RIPE. All four are taken for the first 2 months, then rifampin and isoniazid alone for 4 more.

CDC guidance from 2025 prefers this 6-month regimen for most people with new lung TB². Pyrazinamide is switched into its active form, pyrazinoic acid, by the liver, and is used only in the first phase. Ethambutol is never given on its own⁹. Its label does not recommend it for children under 13⁹. If pyrazinamide cannot be used, treatment runs at least 9 months (Nahid, 2016). A lung cavity plus a culture still positive at 2 months extends the course to 9 months². The full plan is set out on the page for the RIPE four-drug regimen.

Inactive TB is treated with isoniazid, rifampin, rifapentine or a pair of them. CDC guidance from 2025 prefers three regimens: 3HP, 4R and 3HR. They use isoniazid, rifapentine or rifampin for 3 or 4 months. Isoniazid alone for 6 or 9 months is the fallback, with more side effects and fewer people finishing³. 3HP means 12 once-weekly doses of isoniazid with rifapentine, from age 2 but not in pregnancy³. 4R is 120 daily doses of rifampin, a fit for people who cannot take isoniazid³. 3HR is 90 daily doses of isoniazid and rifampin together³. At the end, ask for a written record, because later TB tests may stay positive. The once-weekly partner drug has its own page on rifapentine.

Rifapentine and moxifloxacin are the medications that shorten treatment for active TB to 4 months. In the 4-month regimen they are taken with isoniazid and pyrazinamide for 2 months, then with isoniazid alone. It suits people 12 and older weighing at least 40 kg². Their lung TB must not be known or suspected to be drug-resistant². The whole course runs 17 weeks². The rifapentine label approves the drug for active lung TB from age 12, always alongside other TB drugs. Every option is compared on the page about how TB is treated in the US.

Drug-resistant TB is treated with bedaquiline, pretomanid and linezolid, often with moxifloxacin. CDC guidance from 2025 lists two 6-month regimens, BPaLM and BPaL, for people 14 and older with rifampin-resistant lung TB. Multidrug-resistant (MDR) TB resists at least isoniazid and rifampin, CDC noted in 2025⁴. BPaLM is used when the germs still respond to fluoroquinolones⁴. BPaL is used when they do not, or when that drug is not tolerated⁴. The FDA approved bedaquiline (Sirturo) for MDR TB in 2012 and pretomanid on August 14, 2019. The bedaquiline label carries a boxed warning for QTc prolongation, a heart rhythm change, so ECGs are monitored. In a 2020 trial of BPaL, nerve damage in the hands and feet was reported in 81% of patients (Conradie, 2020). People treated are followed for 2 years after finishing⁴.

Yes, TB medications are antibiotics aimed at Mycobacterium tuberculosis, the germ that causes TB. A 2026 WHO fact sheet says TB disease is usually treated with antibiotics. Rifampin, a semisynthetic antibiotic made from rifamycin SV, blocks an enzyme called DNA-dependent RNA polymerase inside the germ⁷. Isoniazid blocks the mycolic acids that form part of the germ's cell wall⁸. Ethambutol halts actively growing mycobacteria, so each drug hits the germ in a different way⁹. The wider germ family is described on the page about Mycobacterium.

TB medication is taken for 4, 6 or 9 months for active TB and 3 to 9 months for inactive TB. CDC guidance from 2025 ties the length to the treatment plan, and some children need longer. The standard course is 2 months of four drugs, then 4 or 7 months of rifampin and isoniazid². Symptoms often ease within a few weeks, but the germs are still alive⁶. Stopping too soon can make you sick again, and surviving germs can learn to resist the drugs⁶. Most healthy people do not need TB treatment again once it is finished¹. Recovery timelines are laid out on the page about how long tuberculosis lasts.

TB medication is swallowed on a set schedule, either on your own or under directly observed therapy (DOT). With DOT, a health worker watches each dose in person or by video, daily or several times a week. Under 2025 CDC guidance, watched dosing is the standard of care, and watching by video works as well as in person. People who take medicine on their own can use alarms, calendars or pill dispensers as reminders⁶. Rifampin is taken with water 1 hour before or 2 hours after a meal⁷. Isoniazid is not taken with food⁸. Rifapentine, by contrast, is taken with meals, and its tablets may be crushed into a little soft food. After a missed dose, CDC advised in 2025, you skip it, take the next scheduled one and tell your provider. Missing too many doses raises the chance of drug resistance². The visits and video calls are explained on the page on directly observed therapy (DOT) for tuberculosis.

Yes, active TB in the lungs or throat can stay contagious for a while after medication starts. CDC guidance from 2025 says most people feel better after a few weeks of medicine and may no longer be infectious. Stay away from work or school until your provider says it is safe, CDC advised in 2025. At home, sleep apart from others and let fresh air into the room. Repeat sputum tests or chest X-rays tell your provider when the risk of spreading TB has passed. In hospital, airborne precautions end once the patient is on effective therapy, improving and has 3 negative sputum smears on separate days. TB outside the lungs and throat usually does not spread, and inactive TB cannot. Where and how long people stay apart is covered under isolation for tuberculosis.

Yes, TB medication can damage the liver, mainly isoniazid, rifampin and pyrazinamide. A 2016 US treatment guideline says pyrazinamide is often the drug implicated in liver injury. On the four-drug regimen, the liver enzyme ALT rises without symptoms in nearly 20% of patients (Nahid, 2016). Liver injury is suspected when ALT reaches 3 times the upper limit of normal with symptoms. The drugs are stopped once ALT reaches 5 times that limit, with or without symptoms. Once the liver recovers, the drugs are restarted one at a time, rifampin first. Liver tests are done at the start of treatment for TB disease. More frequent tests suit people who drink alcohol daily or have liver disease, HIV or hepatitis. For isoniazid, the label puts the hepatitis risk at about 23 per 1,000 people aged 50 to 64⁸. The page on pyrazinamide side effects covers liver injury and gout from that drug.

TB medications cause some harmless side effects and a few serious ones. Rifampin and rifapentine turn urine, sweat, tears and saliva orange, which CDC guidance from 2025 calls harmless. CDC guidance from 2025 says reactions are relatively rare but can be severe⁵. The most common are stomach problems, hepatitis, rash and fever⁵. Minor effects such as a rash or upset stomach usually let people keep taking the medicine⁶. Nerve damage is the most common toxic effect of isoniazid, and vitamin B6 is added for people prone to it⁸. Pyrazinamide raises uric acid, which can bring joint aches and, rarely, gout⁵. Rifampin and rifapentine can lower platelets, which shows up as easy bruising⁵. On the weekly 3HP regimen, flu-like and allergic reactions top the list of side effects. CDC guidance from 2025 lists these warning signs to report at once¹.

• Belly pain
• Nausea or vomiting
• Yellow skin or eyes
• Dizziness or lightheadedness
• Loss of appetite
• Flu-like symptoms
• Tingling or numbness in the hands or feet

The nerve and liver effects of one drug are detailed under isoniazid side effects.

While taking TB medication, you should avoid alcohol, missed doses and any new medicine or herbal product your provider has not checked. Hormonal birth control works less reliably with rifampin or rifapentine, and CDC advice from 2025 is to add a barrier method. Alcohol can harm the liver during treatment, CDC warned in 2025¹. With isoniazid, avoid foods high in tyramine, such as cheese and red wine, and in histamine, such as tuna⁸. Rifampin is taken at least 1 hour before any antacid⁷. It lowers the levels of warfarin, methadone and several HIV medicines⁷. Rifampin can stain soft contact lenses for good⁷. A fuller list sits on the page about rifampin interactions.

These short answers cover combination, timing, history, eyesight, cost and prevention.