In active TB treatment, what describes the intensive phase?

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Multiple Choice

In active TB treatment, what describes the intensive phase?

Treating active TB aims to rapidly reduce the bacterial load and prevent the emergence of drug resistance, so the initial, intensive phase uses multiple drugs with different actions. The standard intensive phase lasts two months and includes four medications: isoniazid, rifampin, pyrazinamide, and ethambutol. This four-drug combination targets various bacterial populations and blocks resistance pathways; pyrazinamide helps shorten therapy by sterilizing bacilli in acidic environments, and ethambutol provides an initial safeguard when drug susceptibility is not yet confirmed. After this intensive phase, therapy moves to a continuation phase with two drugs for several more months. Why the other options don’t fit: combining only two drugs for four weeks isn’t enough to prevent resistance or effectively clear the infection; using six medications for three months isn’t the standard TB regimen; and using three drugs for two months misses one of the key agents needed to prevent resistance and ensure thorough initial sterilization.

Treating active TB aims to rapidly reduce the bacterial load and prevent the emergence of drug resistance, so the initial, intensive phase uses multiple drugs with different actions. The standard intensive phase lasts two months and includes four medications: isoniazid, rifampin, pyrazinamide, and ethambutol. This four-drug combination targets various bacterial populations and blocks resistance pathways; pyrazinamide helps shorten therapy by sterilizing bacilli in acidic environments, and ethambutol provides an initial safeguard when drug susceptibility is not yet confirmed. After this intensive phase, therapy moves to a continuation phase with two drugs for several more months.

Why the other options don’t fit: combining only two drugs for four weeks isn’t enough to prevent resistance or effectively clear the infection; using six medications for three months isn’t the standard TB regimen; and using three drugs for two months misses one of the key agents needed to prevent resistance and ensure thorough initial sterilization.

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