Cotrimoxazole-induced hyperkalemia in renal transplant patient-Case report.

We present the case of a 55-year-old male patient who developed hyperkalemia after using Cotrimoxazole (TMP-SMX). There was a marked increase in potassium levels from 3.3 mEq/L on Day 5 when cotrimoxazole was started to 6.2 mEq/L on Day 11 when the drug was withheld.