I came across two articles recently which highlighted neurological complications of metronidazole I was previously unaware of.
The first is a case report of metronidazole-induced encephalopathy in the journal Neurocritical Care. I admit I only read the abstract and the key word there is involvement of the dentate nuclei.
The second case report is of metronidazole-induced ataxia in the journal Movement Disorders.
These are rather uncommon side-effects and should not deter from prescribing metronidazole. But it is just worth looking more carefully at that medication list if your next patient has unexplained encephalopathy or ataxia.