Impaired effectiveness w/ protein & other unsaturated organic compd. Weakening effects w/ wound treatment prep containing enzymatic components. Reduced effects w/ products containing Hg, silver, hydrogen peroxide, & taurolidine. May cause transient dark discolourations at application site when used before or after octenidine. False +ve lab results (eg, tests w/ toluidine or gum guaiac for Hb or glucose determination in stool or urine). Interference w/ various investigations (thyroid scintigraphy, determination of protein-bound iodine, radioiodine diagnostics).