Reduced Toxicity With Gradual Initiation of Trimethoprim-Sulfamethoxazole as Primary Prophylaxis for Pneumocystis carinii Pneumonia: AIDS Clinical Trials Group 268.Para, Michael F.; Finkelstein, Dianne; Becker, Simone; Dohn, Michael; Walawander, Ann; Black, John R.; the AIDS Clinical Trials Group 268 Study TeamJAIDS Journal of Acquired Immune Deficiency Syndromes: August 1, 2000 CLINICAL SCIENCE: PDF Only Abstract Abstract : Trimethoprim-sulfamethoxazole (TMP/SMX) is recognized as the superior agent for Pneumocystis carinii pneumonia (PCP) prophylaxis but a high incidence of adverse drug reactions, which may be due to toxic drug metabolites, limits its use. AIDS Clinical Trials Group protocol 268 was a randomized, double-blind, controlled two-arm trial designed to determine whether gradual initiation of TMP/SMX suspension reduced the incidence of treatment-limiting adverse drug reactions compared with routine initiation of double-strength (DS; 160 mg/800 mg) tablets. In all, 372 HIV-1infected study subjects with a CD4+ cell count <250 x 10 cells/mm3 who had not previously received TMP/SMX for PCP prophylaxis were randomized to receive either daily TMP/SMX DS tablets or a gradually increasing dose of TMP/SMX suspension. The suspension dose was increased to reach the equivalent of a DS tablet by study day 13. During the first 2 weeks, study subjects also received a matching placebo tablet/suspension. After week 2, all study subjects received TMP/SMX tablets for the next 10 weeks. There were significantly fewer study subjects who discontinued prophylaxis during the first 12 weeks when TMP/SMX therapy was initiated gradually (17%) than when initiated in DS tablet formulation (33%) (p = .0002). Gradual initiation was also associated with significantly fewer adverse drug reactions. Gradual initiation of TMP/SMX for primary PCP prophylaxis reduces the incidence of its treatment-limiting adverse effects. (C) 2000 Lippincott Williams & Wilkins, Inc.