A Case Involving Linezolid-induced Fatal Lactic Acidosis and Pancytopenia.

We present a case of a 77-year-old female diagnosed with multidrug-resistant (MDR) pulmonary tuberculosis (PTB), on all oral longer regimen [according to Indian Programmatic Management of Drug Resistant Tuberculosis (PMDT) guidelines] for a month. She presented with nausea, vomiting, worsening of breathlessness for a week, pancytopenia, and gradually increasing lactate levels. Various causes of lactic acidosis including metabolic, septic, and hypoxic were ruled out. Despite our dedicated efforts, she tragically passed away due to severe lactic acidosis, a complication associated with linezolid treatment.