This study evaluated the spread and possible changes in resistance patterns of ESKAPE bacteria to first-choice antibiotics from 2015 to 2019 at a third-level university hospital after persuasive stewardship measures were implemented. Isolates were divided into three groups (group 1, low drug-resistant; group 2, multidrug/extremely drug-resistant; and group 3, pan-resistant bacteria) and a
chi-squared
test (
χ
2
) was applied to determine differences in their distributions. Among the 2,521 isolates,
Klebsiella pneumoniae
was the most frequently detected (31.1%). From 2015 to 2019, the frequency of isolates in groups 2
and
3 decreased from 70.1% to 48.6% (
χ
2
= 63.439;
p
< 0.0001). Stratifying isolates by bacterial species, for
K. pneumoniae
, the frequency of PDR isolates decreased from 20% to 1.3% (
χ
2
= 15.885;
p
= 0.003). For
Acinetobacter baumannii
, a statistically significant decrease was found in groups 2
and
3: from 100% to 83.3% (
χ
2
= 27.721;
p
< 0.001). Also, for
Pseudomonas aeruginosa
and
Enterobacter
spp., the frequency of groups 2
and
3 decreased from 100% to 28.3% (
χ
2
= 225.287;
p
< 0.001) and from 75% to 48.7% (
χ
2
= 15.408;
p
= 0.003), respectively. These results indicate that a program consisting of persuasive stewardship measures, which were rolled out during the time frame of our study, may be useful to control drug-resistant bacteria in a hospital setting.