Conditions and symptoms
What Is Tuberculosis (TB)? Why Medicine Labels Mention It
Tuberculosis · say it: too-BER-kyuh-LOH-sisAlso written: TB, latent TB, active TB, latent tuberculosis infection
Short answer
Tuberculosis (TB) is an infection caused by a bacterium that usually affects the lungs. It can be active (causing illness) or latent (dormant).
What it means
Tuberculosis is caused by the bacterium Mycobacterium tuberculosis. It spreads through the air when someone with active lung TB coughs. Many people who are infected have latent TB: the germ is in the body but inactive, causing no symptoms, and it cannot spread. Active TB causes illness, often a cough lasting weeks, fever, night sweats and weight loss. It is treated with several medicines taken for months.
TB appears on labels in two main ways. Medicines that weaken the immune system, such as TNF blockers, JAK inhibitors and long-term corticosteroids, warn that latent TB can wake up, so people are tested before starting. TB medicine labels, such as isoniazid and rifampicin, warn about liver effects and many drug interactions, and stress taking every dose.
A positive TB skin test or blood test (IGRA) usually shows infection at some point; it does not by itself mean active, contagious TB. A chest X-ray and other tests help tell the difference.
Where you may see it
- Boxed warnings on TNF blocker and other immune-suppressing medicine labels
- TB medicine labels (isoniazid, rifampicin)
- TB test results and chest X-ray reports
📄 How it looks on a report
Test patients for latent tuberculosis before starting treatment and during therapy.
🙅 What it does not mean
- A positive TB test does not always mean you are ill or contagious.
- Latent TB cannot be spread to others.
- Feeling better does not mean you can stop TB treatment early.
🗒️ Questions to ask your doctor
💊 Medicines whose labels mention “Tuberculosis”
Plain-English explanations of each medicine, from its official FDA label.
- Dexamethasone
A corticosteroid, a synthetic adrenocortical steroid medicine that lowers inflammation and suppresses the immune system
- Fluconazole
an azole antifungal medicine, a type of medicine that treats fungal (yeast) infections
- Isoniazid
An antibacterial medicine of the antimycobacterial type, used against tuberculosis bacteria
- Prednisolone
a corticosteroid, a type of steroid medicine. The label describes glucocorticoids as adrenocortical steroids, both naturally occurring and synthetic, that are readily absorbed from the stomach and intestines.
- Prednisone
a corticosteroid, a type of steroid medicine that works like the adrenocortical (adrenal gland) steroids the body makes naturally
- Rifampin
an antibiotic of the rifamycin type
🔗 Read more from trusted sources
- “Tuberculosis” on MedlinePlus ↗
US National Library of Medicine
- NCI Dictionary definition ↗
US National Cancer Institute: “tuberculosis”
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