Carbamazepine‐Induced Nonepileptic Myoclonus in a Child with Benign Epilepsy

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Abstract
Myoclonic jerks involving the proximal limb musculature and tic-like movements (sniffing, coughing, or sighing) were observed in an 11-year-old boy with benign occipital epilepsy treated with carbamazepine (CBZ). The involuntary movements disappeared a few days after withdrawal of CBZ and reappeared with CBZ reintroduction. Plasma CBZ levels were always within the therapeutic range. Polygraphic studies failed to show any electroencephalogram (EEG) changes during myoclonic jerks. Appearance of nonepileptic myoclonus in epileptic children treated with CBZ should be carefully evaluated to prevent worsening of the clinical picture. The coexistence of other involuntary movements (tics) could suggest the correct diagnosis.