Methemoglobinemia is a rare but fatal disorder of the oxygen-carrying capacity of hemoglobin. Here is a case representing high-dose Sulfamethoxazole/ Trimethoprim ( SMX/TMP ) induced Methemoglobinemia in a boy treated for Ventilator-associated pneumonia (VAP), which was resolved successfully after administration of methylene blue and discontinuation of SMX/TMP

In this report, a case of high dose of sulfamethoxazole/trimethoprim‐induced methemoglobinemia and is reported in a young boy with ventilator‐associated pneumonia and was treated successfully with methylene blue and cessation of the offending agent.