How many phases does standard tuberculosis treatment usually have?

How many phases does standard tuberculosis treatment usually have?

• A. One
• B. Four
• C. Two
• D. Three

Answer: (C)

Two phases are used in standard tuberculosis treatment: an intensive initial phase and a continuation phase. The goal of the initial phase, usually about two months, is to rapidly reduce the bacillary load and prevent the development of resistance by using a four-drug regimen (isoniazid, rifampin, pyrazinamide, and ethambutol). After this, the continuation phase, typically around four months, uses two drugs (isoniazid and rifampin) to finish eradicating the remaining bacteria and minimize relapse risk. This two-phase structure aligns with the usual six-month regimen for drug-susceptible TB. In drug-resistant TB, regimens are longer and more complex, but they still follow a phased approach.

Two phases are used in standard tuberculosis treatment: an intensive initial phase and a continuation phase. The goal of the initial phase, usually about two months, is to rapidly reduce the bacillary load and prevent the development of resistance by using a four-drug regimen (isoniazid, rifampin, pyrazinamide, and ethambutol). After this, the continuation phase, typically around four months, uses two drugs (isoniazid and rifampin) to finish eradicating the remaining bacteria and minimize relapse risk. This two-phase structure aligns with the usual six-month regimen for drug-susceptible TB. In drug-resistant TB, regimens are longer and more complex, but they still follow a phased approach.