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Correspondence

Linezolid-Induced Lactic Acidosis

N Engl J Med 2003; 348:86-87January 2, 2003

Article

To the Editor:

Linezolid is an oxazolidinone antibiotic used to treat a variety of gram-positive infections, including those due to methicillin-resistant Staphylococcus aureus and vancomycin-resistant enterococci, as well as nocardia species.1,2 Lactic acidosis is an adverse effect that has been associated with other drugs, including metformin and the nucleoside reverse-transcriptase inhibitors,3 but not with linezolid. We report a case in which severe lactic acidosis developed as an adverse effect of linezolid treatment.

A 52-year-old woman presented with fever, chills, and a two-week history of intermittent cough. Computed tomography (CT) of her chest revealed an infiltrate in the right middle lobe, as well as mediastinal adenopathy. Nocardia otitidis-caviarum was isolated from bronchoalveolar-lavage fluid as well as from a mediastinal biopsy specimen. Additional CT scanning revealed disseminated disease with involvement of the brain, kidneys, and adrenals.

The patient was initially treated with trimethoprim–sulfamethoxazole but had serious side effects that necessitated discontinuation. She was subsequently switched to linezolid and clarithromycin. Her treatment was complicated by myelosuppression, nausea, and vomiting, and gatifloxacin was substituted for the clarithromycin in the hope of relieving the nausea. During the subsequent five weeks, she had persistent vomiting and ongoing myelosuppression. Endoscopy revealed duodenal ulcers, and pantoprazole was started. The patient was hospitalized for intractable nausea and vomiting after 11 weeks of treatment with linezolid and 5 weeks of treatment with gatifloxacin. The findings on repeated endoscopy were normal. The patient was euvolemic and received intravenous fluids during hospitalization.

Because she had low bicarbonate levels, the patient's lactate level was checked and found to be more than 9.9 mmol per liter. Both antibiotics were stopped, resulting in a normalization of lactate levels at 1.4 mmol per liter after 10 days. Both antibiotics were then restarted, but the lactate level measured seven days later was 4.8 mmol per liter. Her nausea returned. The gatifloxacin was discontinued, and the lactate level had increased to 6.5 mmol per liter one week later. Discontinuation of linezolid resulted in normalization of the lactate level after two weeks. There were no other changes in medications during that time. The patient was then treated with moxifloxacin. Her lactate levels remained normal, and the disseminated nocardiosis resolved.

Lactic acidosis is a toxic effect of linezolid whose mechanism is unknown. Other drugs, including metformin and nucleoside reverse-transcriptase inhibitors, have been associated with lactic acidosis. In the case of nucleoside reverse-transcriptase inhibitors, lactic acidosis is thought to involve mitochondrial toxicity,4,5 and linezolid may have a similar effect. As we report here, a potentially serious side effect occurred in a patient receiving linezolid. The serum lactate level in patients taking linezolid should be measured if they have nausea or a low serum bicarbonate level.

Aaron A. Apodaca, M.D.
Robert M. Rakita, M.D.
Virginia Mason Medical Center, Seattle, WA 98111

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