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Summary
Ethambutol can cause peripheral neuropathy and optic neuritis in patients with drug-resistant tuberculosis. Early neuropathy symptoms may warn of impending vision loss, necessitating prompt drug withdrawal.
Area of Science:
- Neurology
- Ophthalmology
- Infectious Diseases
Background:
- Drug-resistant tuberculosis (DR-TB) requires multi-drug regimens, often including ethambutol.
- Ethambutol is a key second-line agent for DR-TB treatment.
- Neurological and visual toxicities are known side effects of ethambutol.
Observation:
- A patient undergoing ethambutol retreatment for DR-TB developed peripheral neuropathy.
- Optic neuritis subsequently developed in the same patient.
- Neuropathy and ocular symptoms resolved after ethambutol discontinuation.
Findings:
- Peripheral neuropathy symptoms can precede ethambutol-induced optic neuritis by months.
- This sequence suggests neuropathy as a potential early warning sign.
- Prompt drug withdrawal is crucial for managing ethambutol toxicity.
Implications:
- Clinicians should monitor for peripheral neuropathy in patients on ethambutol.
- Early recognition of neuropathy may prevent severe visual impairment.
- This case highlights the importance of vigilant monitoring for ethambutol-related toxicities.