For MAC prophylaxis in AIDS, which regimen is recommended?

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Multiple Choice

For MAC prophylaxis in AIDS, which regimen is recommended?

Explanation:
Preventing MAC infection in AIDS relies on starting prophylaxis when the immune system is severely weakened, specifically when the CD4 count falls below 50 cells per microliter. The recommended approach is azithromycin 1200 mg once weekly, because this regimen effectively prevents disseminated MAC, is easy to take, and has fewer drug interactions. Clarithromycin 500 mg twice daily is an acceptable alternative if weekly dosing isn’t feasible, but weekly azithromycin is preferred for practicality. Drugs like isoniazid or rifampin are used for TB prophylaxis and do not prevent MAC; rifampin also interacts with macrolides, making it less suitable here. Prophylaxis at a CD4 threshold of 50 is standard, so starting azithromycin at that level best aligns with guidelines.

Preventing MAC infection in AIDS relies on starting prophylaxis when the immune system is severely weakened, specifically when the CD4 count falls below 50 cells per microliter. The recommended approach is azithromycin 1200 mg once weekly, because this regimen effectively prevents disseminated MAC, is easy to take, and has fewer drug interactions. Clarithromycin 500 mg twice daily is an acceptable alternative if weekly dosing isn’t feasible, but weekly azithromycin is preferred for practicality. Drugs like isoniazid or rifampin are used for TB prophylaxis and do not prevent MAC; rifampin also interacts with macrolides, making it less suitable here. Prophylaxis at a CD4 threshold of 50 is standard, so starting azithromycin at that level best aligns with guidelines.

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