We therefore explored the in vitro combination of amphotericin B with itraconazole against 14 clinical Aspergillus fumigatus isolates ( 9 itraconazole susceptible and 5 itraconazole resistant ) with a colorimetric broth microdilution checkerboard technique using two drug interaction models able to explore complicated patterns of interactions : the response surface analysis of Bliss independence and the isobolographic analysis of Loewe additivity zero interaction theories .
The concentration-dependent nature of in vitro amphotericin B-itraconazole interaction against Aspergillus fumigatus: isobolographic and response surface analysis of complex pharmacodynamic interactions. The interaction between polyenes and azoles is not well understood. We therefore explored the in vitro combination of amphotericin B with itraconazole against 14 clinical Aspergillus fumigatus isolates ( 9 itraconazole susceptible and 5 itraconazole resistant ) with a colorimetric broth microdilution checkerboard technique using two drug interaction models able to explore complicated patterns of interactions : the response surface analysis of Bliss independence and the isobolographic analysis of Loewe additivity zero interaction theories . Synergy was found at combinations with low concentrations of amphotericin B (<0.125 mg/L), whereas antagonism was found at combinations with higher concentrations of amphotericin B. For itraconazole-resistant isolates, synergistic interactions were observed at high concentrations of itraconazole (>0.5 mg/L). Synergy was more frequently observed for the itraconazole-resistant isolates than for the itraconazole-susceptible isolates.
### Instruction:
            Given the context about compound efficacy for the given treatment mentioned within the input, mentioned the compounds 
            that can co-occur for the mentioned treatment

            ### Input:
            The concentration-dependent nature of in vitro amphotericin B-itraconazole interaction against Aspergillus fumigatus: isobolographic and response surface analysis of complex pharmacodynamic interactions. The interaction between polyenes and azoles is not well understood. We therefore explored the in vitro combination of amphotericin B with itraconazole against 14 clinical Aspergillus fumigatus isolates ( 9 itraconazole susceptible and 5 itraconazole resistant ) with a colorimetric broth microdilution checkerboard technique using two drug interaction models able to explore complicated patterns of interactions : the response surface analysis of Bliss independence and the isobolographic analysis of Loewe additivity zero interaction theories . Synergy was found at combinations with low concentrations of amphotericin B (<0.125 mg/L), whereas antagonism was found at combinations with higher concentrations of amphotericin B. For itraconazole-resistant isolates, synergistic interactions were observed at high concentrations of itraconazole (>0.5 mg/L). Synergy was more frequently observed for the itraconazole-resistant isolates than for the itraconazole-susceptible isolates.

            ### Response:
            amphotericin, itraconazole, itraconazole, itraconazole
            