Meget sjælden: parosmi (nedsat lugtesans), anosmi (forsvinder normalt efter afbrydelse), grand mal - anfald, unormal (ustabil) gang, intrakraniel hypertension, ataksi, hyperæstesi, hypertoni.
Very rare: parosmia (impaired smell), anosmia (usually reversible after interruption), grand mal convulsion, abnormal (unstable) gait, intracranial hypertension, ataxia, hyperesthesia, hypertonia.