Shopsin B, Gershon S
Am J Psychiatry. 1975 May;132(5):536-8. doi: 10.1176/ajp.132.5.536.
Neurological examinations of 27 outpatients receiving lithium carbonate maintenance therapy for recurrent affective illness revealed that most of the patients receiving lithium for more than 8 months had cogwheel rigidity. The data suggest a positive correlation between the duration of lithium maintenance and the severity of cogwheeling. Intravenous administration of benztropine, an antiparkinsonian drug, did not abolish or significantly ameliorate this symptom.
