Abstract
Many drugs are added to peritoneal dialysis solutions In continuous ambulatory peritoneal dialysis (CAPD) patients, principally during episodes of peritonitis when antibiotics and nonantiblotic agents are often administered together. To evaluate the Influence of nonantiblotic drug additives on antibiotic action, we determined the effect of ten drug additives on the antimicrobial activity of rifampin against S. epidermiddis biofilms. None of the additives had any direct effect on biofilm bacteria. While five additives did not affect rifampin action, the other five strongly antagonized rifampin. Insulin and heparin were among these five antagonists. This antagonism suggests that a significant degree of Inhibition of antibiotic action may occur by the coadministration of agents In the treatment of peritonitis, particularty in diabetic patients.
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