Drug-Resistant Tuberculosis (DR-TB) occurs when a strain of the tuberculosis bacteria has become resistant to one or more anti-TB drugs and cannot be treated with standard therapies. In cases like this, it is essential that patients receive prompt diagnosis and treatment in order to avoid long-term health consequences or even death. Treatment plans for DR-TB often include longer courses of medication as well as new drugs that are not used in standard therapy regimens such as injectable medicines.