Objective: To describe a patient with Parkinson disease in whom compulsive singing developed without other types of pathologic behavior after starting treatment with pergolide.
Material: An 82-year-old woman with Parkinson disease was given pergolide (250 μg/d), without modifying the doses of other medications.
Results: She started to hum the same melody and often sang songs repeatedly. Pergolide was discontinued, and the episodes of repetitive humming and singing were markedly decreased.
Conclusions: Our observations suggest that a dopamine agonist may contribute to compulsive singing in Parkinson disease.