Drug-Related Eyelid Nystagmus: Two Cases of a Rare Clinical Phenomenon Related to Carbamazepine and Derivatives.

BACKGROUND: Eyelid nystagmus is a rare clinical phenomenon described mostly related to brainstem or cerebellum lesions. The mechanism of this phenomenon is incompletely understood. PATIENTS AND METHODS: We report 2 cases of eyelid nystagmus induced by carbamazepine and oxcarbazepine intoxication. CONCLUSIONS: Carbamazepine and derivatives may induce eyelid nystagmus in the setting of acute intoxication. To the best of our knowledge, these are the first cases of drug-related eyelid nystagmus.