Quality and Patient Safety Articles-Toxic Neuropathy Following Treatment With Linezolid

Toxic Neuropathy Following Treatment With Linezolid

Pdf Summary

This case describes a 54-year-old man who developed progressive sensory loss, gait unsteadiness, and exam findings consistent with a length-dependent axonal sensory-motor polyneuropathy after several months of linezolid therapy. Other common causes of neuropathy were not supported by testing, and symptoms stabilized after stopping the drug, making linezolid toxicity the likely cause.

The key teaching point is that the <strong>most significant risk factor for linezolid-associated toxic neuropathy is prolonged treatment, especially beyond 28 days</strong>.

<strong>Correct answer: D. Prolonged treatment (28 days)</strong>

<h3>Summary of the explanation:</h3>
- Linezolid is an oxazolidinone antibiotic used for resistant gram-positive infections and some multidrug-resistant infections.
- Peripheral and optic neuropathy are known adverse effects, particularly with <strong>extended use</strong>.
- Toxicity is linked to <strong>mitochondrial protein synthesis inhibition</strong>.
- Risk is driven mainly by <strong>duration of therapy</strong>, not so much by dose or comorbidities like diabetes.
- Neuropathy may become irreversible if treatment continues too long.
- Early recognition and discontinuation can improve outcomes.

<h3>Clinical phenotype:</h3>
- Sensory or sensorimotor <strong>axonal polyneuropathy</strong>
- Often length-dependent
- May present with numbness, gait instability, and loss of proprioception

<h3>Practical takeaway:</h3>
When patients are on linezolid for more than 28 days, clinicians should monitor closely for neurologic symptoms and consider stopping the drug if neuropathy develops.

Keywords

linezolid

toxic neuropathy

prolonged treatment

28 days

peripheral neuropathy

axonal polyneuropathy

sensory-motor neuropathy

mitochondrial toxicity

gait unsteadiness

drug adverse effect