synergism , defined as at least a 2-log ( 2 ) -dilution lowering of the minimal inhibitory concentration of either antibiotic in the combination compared with the minimal inhibitory concentration of the antibiotic alone , was observed with 15 of 23 ( 65 % ) isolates tested against trimethoprim and gentamicin and 14 of 23 ( 61 % ) isolates tested against sulfamethoxazole-trimethoprim and gentamicin .
C0041041
trimethoprim
C0041044
sulfamethoxazole-trimethoprim