Parkinsonism can also result from medications (drug-induced parkinsonism), especially the dopamine receptor blocking agents such as the antipsychotics and antiemetics. It can result from certain toxins (such as carbon monoxide and organic solvents) as well as metabolic abnormalities (hypoparathyroidism). Structural injuries – chronic repetitive head trauma, hydrocephalus, subcortical small vessel ischemic vasculopathy ("vascular parkinsonism") – can also produce parkinsonism.
Thus the prognosis is variable, from static to progressive, depending on the etiology. Other symptoms and signs along with predisposing medical history and risk factors can yield valuable clues to the etiology.
Related topic: drug-induced movement disorders
G20.C – Parkinsonism, unspecified
32798002 – Parkinsonism
Differential Diagnosis & Pitfalls
Drug Reaction Data