Which drug is used for Pneumocystis jirovecii pneumonia prophylaxis in HIV/AIDS patients?

Which drug is used for Pneumocystis jirovecii pneumonia prophylaxis in HIV/AIDS patients?

• A. Azithromycin
• B. Isoniazid
• C. TMP-SMX
• D. Fluconazole

Answer: (C)

Prophylaxis against Pneumocystis jirovecii pneumonia in HIV/AIDS relies on trimethoprim-sulfamethoxazole. This combination is the most effective and widely used first-line option when the CD4 count drops below 200 cells/mm3 or there is another risk factor such as oropharyngeal candidiasis. It provides strong protection against Pneumocystis and also offers coverage against Toxoplasma gondii, making it particularly practical for preventing multiple opportunistic infections with a single agent. Typical regimens include one double-strength tablet daily or three times weekly, with adjustments for kidney function and tolerance. If someone cannot take sulfa drugs, alternatives like dapsone, atovaquone, or inhaled pentamidine can be used, though they may be less effective or have different side-effect profiles. Other drugs listed are not used for PCP prophylaxis: azithromycin is used for MAC prophylaxis and certain respiratory infections, isoniazid targets latent TB, and fluconazole is an antifungal therapy.

Prophylaxis against Pneumocystis jirovecii pneumonia in HIV/AIDS relies on trimethoprim-sulfamethoxazole. This combination is the most effective and widely used first-line option when the CD4 count drops below 200 cells/mm3 or there is another risk factor such as oropharyngeal candidiasis. It provides strong protection against Pneumocystis and also offers coverage against Toxoplasma gondii, making it particularly practical for preventing multiple opportunistic infections with a single agent. Typical regimens include one double-strength tablet daily or three times weekly, with adjustments for kidney function and tolerance. If someone cannot take sulfa drugs, alternatives like dapsone, atovaquone, or inhaled pentamidine can be used, though they may be less effective or have different side-effect profiles. Other drugs listed are not used for PCP prophylaxis: azithromycin is used for MAC prophylaxis and certain respiratory infections, isoniazid targets latent TB, and fluconazole is an antifungal therapy.