Carbamazepine-induced orofacial dyskinesia

Area of Science:

• Neurology
• Pharmacology

Background:

• Extrapyramidal syndromes are known adverse effects of certain antiepileptic drugs like phenytoin and primidone.
• While carbamazepine (Tegretol) is associated with symptoms such as asterixis, dystonia, and tremor, orofacial dyskinesia has not been previously reported.

Observation:

• A patient presented with involuntary movements affecting the tongue, face, and cheeks.
• These symptoms were observed in the context of carbamazepine intoxication.

Findings:

• The reported case demonstrates a dose-related extrapyramidal reaction, specifically lingual-facial-buccal dyskinesia.
• This represents a novel association between carbamazepine and this type of movement disorder.

Implications:

• Clinicians should be aware of the potential for carbamazepine to induce orofacial dyskinesia, even if rare.
• This finding expands the known spectrum of neurological side effects associated with carbamazepine therapy.