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Probable linezolid-induced pancytopenia.

Nita Lakhani¹, William Thompson, Anne Marie Bombassaro

¹London Health Sciences Centre.

The Canadian Journal of Infectious Diseases & Medical Microbiology = Journal Canadien Des Maladies Infectieuses Et De La Microbiologie Medicale

|December 27, 2007

Summary

Linezolid treatment for methicillin-resistant Staphylococcus aureus can cause pancytopenia, a severe drop in blood counts. Close monitoring is crucial for early detection and management of this rare side effect.

Keywords:

Adverse reaction Linezolid Pancytopenia

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Area of Science:

Infectious Diseases
Hematology
Pharmacology

Background:

Linezolid is an antibiotic used for serious infections, including methicillin-resistant Staphylococcus aureus (MRSA).
Patients with comorbidities like diabetes and renal insufficiency may have altered drug metabolism or increased susceptibility to adverse effects.
Diabetic foot osteomyelitis is a complex infection requiring prolonged antibiotic therapy.

Observation:

A 75-year-old male with multiple comorbidities developed pancytopenia (low red blood cells, white blood cells, and platelets) during linezolid therapy for MRSA osteomyelitis.
The patient's blood counts returned to baseline after linezolid discontinuation and supportive care.
The Naranjo scale suggested a probable link between linezolid use and the observed pancytopenia.

Findings:

The patient experienced clinically significant pancytopenia, a rare but serious adverse effect of linezolid.
Hematological recovery occurred after cessation of the antibiotic.
The case highlights a potential drug-induced toxicity impacting multiple blood cell lineages.

Implications:

Clinicians must be vigilant for rare hematological toxicities associated with linezolid.
Prospective identification of at-risk patients and rigorous weekly blood count monitoring are essential.
This case underscores the importance of balancing antibiotic efficacy with potential adverse events in complex patient populations.