You'll be prescribed at least a six-month course of a combination of antibiotics if you're diagnosed with active pulmonary TB, where your lungs are affected and you have symptoms. The usual treatment is: two antibiotics (isoniazid and rifampicin) for six months. This means that the person is cured of TB. However, TB bacteria die very slowly, and so the drugs have to be taken for quite a few months. Even when a patient starts to feel better they can still have bacteria alive in their body. So the person needs to keep taking the TB treatment until all the bacteria are dead. Multi-drug-resistant tuberculosis (MDR-TB) is a form of tuberculosis (TB) infection caused by bacteria that are resistant to treatment with at least two of the most powerful first-line anti-TB medications (drugs), isoniazid and rifampin. Although you may feel better, if you don't finish treatment the TB bacteria are still in your body. You could become seriously ill, develop drug-resistant TB or pass TB on to others. Remember – TB can be fatal. Finishing treatment is the only way to cure tuberculosis completely. TB disease can cause permanent body damage and death. Medicines which can cure TB disease are given to these people. People with TB infection also have the germs that cause TB in their body. But they are not sick because there are not as many of the germs, and the germs lie dormant (sleeping) in their body.