In clinical practice, distinguishing drug-induced parkinsonism from
Parkinson's disease may be difficult. Asymmetry is generally not felt to be
common in drug-induced parkinsonism. The authors investigated asymmetry of
signs and symptoms in 20 patients with drug-induced parkinsonism. Tremor
was identified in seven patients, slowness in five, and mixed symptoms in
eight. A notable asymmetry of signs was seen in six patients. As in
Parkinson's disease, subgroups seem to exist within the group of patients
with drug-induced parkinsonism, and an asymmetry of signs and symptoms is
not uncommon.
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