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Updated: Jun 6, 2026

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Published on: October 2, 2018
Metronidazole induced encephalopathy in a patient with brain abscess
Yoochang Bahn1, Eunyoung Kim, Chongoon Park
1Department of Neurosurgery, Inha University Hospital, Inha University College of Medicine, Incheon, Korea.
Abstract:
Metronidazole is commonly used for brain abscess but is not well known for its neurotoxic complications. Metronidazole-induced encephalopathy (MIEP) is toxic encephalopathy associated with the use of metronidazole. We experienced a case of brain abscess which developed reversible severe MIEP during treatment period. Although MIEP occurs in typical locations, it is not easy to differentiate from other conditions such as cerebral infarction, demyelinating diseases and metabolic diseases. Neurosurgeons should be aware that severe MIEP can occur during the use of metronidazole though it is not common.
Insights
Metronidazole is a common brain abscess treatment, but severe neurotoxic complications like Metronidazole-induced encephalopathy (MIEP) can occur. This reversible condition requires neurosurgical awareness for accurate diagnosis and management.
Area of Science:
- Neurology
- Neurosurgery
- Infectious Diseases
Background:
- Metronidazole is a first-line antibiotic for brain abscess treatment.
- Neurotoxic complications of metronidazole, such as Metronidazole-induced encephalopathy (MIEP), are not widely recognized.
- Differentiating MIEP from other neurological conditions can be challenging.
Observation:
- A case of brain abscess treated with metronidazole developed severe, yet reversible, Metronidazole-induced encephalopathy.
- The patient's MIEP presented with symptoms that mimicked other neurological disorders.
- Typical neuroimaging findings of MIEP were observed, but differential diagnosis was complex.
Findings:
- Metronidazole-induced encephalopathy (MIEP) is a rare but significant neurotoxicity associated with metronidazole therapy.
- Severe MIEP can develop during the treatment of brain abscess, presenting diagnostic challenges.
- Prompt recognition and discontinuation of metronidazole can lead to reversible neurological deficits.
Implications:
- Neurosurgeons and clinicians must consider MIEP in patients treated with metronidazole, especially those with neurological symptoms.
- Awareness of MIEP is crucial for accurate diagnosis, preventing misdiagnosis of conditions like cerebral infarction or demyelinating diseases.
- Early identification and management of MIEP can prevent long-term neurological sequelae, highlighting the importance of vigilant monitoring during metronidazole therapy.
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