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Peritoneal dialysis fluids (PDFs) impair microorganisms' growth, which may compromise effectivity of some antimicrobials. The purpose of this study was to investigate the effect of three different PDFs (lactate/bicarbonate-buffered Physioneal 40® with 2.2% glucose, lactate-buffered Nutrineal PD4® with 1.1% amino acid, and lactate-buffered Extraneal® with 7.5% icodextrin) on biofilm formation of four different Candida spp and antibiofilm effectiveness of anidulafungin, caspofungin and micafungin against Candida spp. biofilm in PDFs. All tested PDFs attained inhibitory effect on the biofilm formation but also reduced biofilm effectiveness of echinocandins against biofilm in PDFs was detected.