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  • Title: A randomized trial of daily and thrice-weekly trimethoprim-sulfamethoxazole for the prevention of Pneumocystis carinii pneumonia in human immunodeficiency virus-infected persons. Terry Beirn Community Programs for Clinical Research on AIDS (CPCRA).
    Author: El-Sadr WM, Luskin-Hawk R, Yurik TM, Walker J, Abrams D, John SL, Sherer R, Crane L, Labriola A, Caras S, Pulling C, Hafner R.
    Journal: Clin Infect Dis; 1999 Oct; 29(4):775-83. PubMed ID: 10589887.
    Abstract:
    We enrolled 2,625 human immunodeficiency virus-infected patients into a randomized trial to assess the efficacy and tolerability of daily vs. thrice-weekly trimethoprim-sulfamethoxazole (160 mg/800 mg) for prophylaxis of Pneumocystis carinii pneumonia (PCP). The rate of PCP was 3.5 and 4.1 per 100 person-years in the daily and thrice-weekly groups, respectively, with a relative risk (RR) of 0.82 (95% confidence interval [CI], 0.61-1.09; P = .16) (RR of <1.0 favors daily trimethoprim-sulfamethoxazole). The RR for PCP determined by on-treatment analysis was 0.59 (P = .03). The RR for death was 0.91 (P = .12); for bacterial pneumonia, 0.82 (P = .06); and for combined PCP and bacterial pneumonia, 0.84 (P = .04). Discontinuation due to adverse events occurred more commonly in the daily trimethoprim-sulfamethoxazole group (RR, 2.14; 95% CI, 1.73-2.66; P < .001). Overall estimates for efficacy end points favored daily trimethoprim-sulfamethoxazole, although rates of intolerance were higher among patients receiving that dose. Daily trimethoprim-sulfamethoxazole may offer advantages as a first choice for PCP prophylaxis; thrice-weekly dosing is an appropriate option for patients intolerant of the daily dose.
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