RT Book, Section A1 Stringer, Janet L. SR Print(0) ID 1142821564 T1 Drugs Used in Tuberculosis and Leprosy T2 Basic Concepts in Pharmacology: What You Need to Know for Each Drug Class, 5e YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9781259861079 LK accesspharmacy.mhmedical.com/content.aspx?aid=1142821564 RD 2024/04/19 AB The mycobacteria that cause tuberculosis and leprosy are very slow growing, so therapy must be continued for relatively long periods of time. To prevent the emergence of resistant strains, it is vital to employ combination therapy with as many as four or five agents to which the organism is sensitive. The current treatment regimen for TB (which is subject to change) is 2 months of isoniazid, rifampin, pyrazinamide, and ethambutol, followed by 4 months of isoniazid and rifampin. Increasing the duration of therapy or changing the choice of drugs depends on culture and sensitivity results and factors that increase risk of treatment failure.