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Metronidazole-induced central nervous system toxicity: a systematic review
Akira Kuriyama1, Jeffrey L Jackson, Asako Doi
1Department of General Internal Medicine, Rakuwakai Otowa Hospital, Kyoto, Japan.
Clinical Neuropharmacology
|October 15, 2011
Summary
Metronidazole rarely causes central nervous system toxicity, not linked to dose or duration. Most patients show MRI abnormalities but fully recover after stopping the medication.
Area of Science:
- Neurology
- Pharmacology
- Toxicology
Background:
- Metronidazole is an antibiotic commonly used to treat anaerobic bacterial and protozoal infections.
- Central nervous system (CNS) toxicity is a rare but serious adverse effect associated with metronidazole use.
Observation:
- A review of 64 case reports identified metronidazole-induced CNS toxicity.
- Cerebellar dysfunction was the most common manifestation (77%), followed by altered mental status (33%) and seizures (15%).
- Toxicity was not clearly dose- or duration-dependent, with some patients experiencing symptoms after short-term use.
Findings:
- Most patients (86%) underwent brain imaging, with magnetic resonance imaging (MRI) revealing abnormalities in most cases (69%).
- Cerebellar lesions were common (93%) in patients with cerebellar dysfunction.
- Complete symptom resolution occurred in 65% of patients after metronidazole discontinuation, with 83% showing resolution of MRI abnormalities.
Implications:
- Metronidazole-induced CNS toxicity is a rare but recognized adverse effect.
- Early recognition and cessation of metronidazole are crucial for favorable outcomes.
- Further research may elucidate specific patient or medication factors predisposing to this toxicity.
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