Eligibility criteria
Adult patients (≥18 years) with normal renal function (GFR ≥60 mL/min/1.73 m2) who received co-trimoxazole during the study period and had documented potassium serum levels during follow up, were included. Patients who received less than two doses of co-trimoxazole and/or had no potassium follow-up were excluded from the study.