Colistin, an antibiotic of polymyxin group, has recently been increasingly used in the treatment of multidrug resistant gram-negative bacteria. However, it has serious adverse effects such as acute kidney injury (AKI).

We aimed to determine the factors affecting the development of AKI due to colistin, which has serious adverse effects, such as nephrotoxicity and neurotoxicity.

We retrospectively analyzed the data of patients who received colistin for multidrug resistant gram-negative sepsis in adult intensive care units between January 2020 and December 2022.

Demographic data, blood test results, concomitant drug use, need for renal replacement therapy, and mortality were recorded. Kidney damage was assessed according to the Kidney Disease Improving Global Outcomes criterion.

We obtained data from 103 patients, 45 (43.7%) of whom were women.

The most common comorbidity was a neurological disorder.

Renal damage developed in 59.2% of patients.

Renal replacement was required in 50.8% of the patients.

Among patients who received colistin, 64.1% died.

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