medication-induced parkinsonism
Movement disorder resembling Parkinson's disease caused by medications that block dopamine receptors, common in elderly patients.
Full Definition
Medication-induced parkinsonism represents a significant iatrogenic movement disorder in geriatric populations, caused by medications that block dopamine receptors or deplete dopamine stores. The condition manifests with tremor, rigidity, bradykinesia, and postural instability that clinically resembles idiopathic Parkinson's disease but results from pharmacological interference with dopaminergic neurotransmission. Common causative agents include antipsychotic medications, antiemetics like metoclopramide, and certain antidepressants. Elderly patients are particularly vulnerable due to age-related changes in drug metabolism, increased sensitivity to dopamine blockade, and frequent polypharmacy. The condition is typically reversible upon discontinuation of the offending agent, though improvement may take weeks to months and may be incomplete in some cases. Early recognition is crucial to prevent unnecessary disability and distinguish from idiopathic Parkinson's disease, which requires different treatment approaches.
Usage
Usage note: Always consider recent medication changes when evaluating new-onset parkinsonian symptoms in elderly patients.
In Context
- "The patient developed medication-induced parkinsonism after starting metoclopramide for gastroparesis." — Neurology consultation note
- "Medication-induced parkinsonism improved gradually over three months after discontinuing the antipsychotic." — Movement disorders follow-up visit