title: Letter: Dependence on antiparkinsonian drugs.
mesh_terms: D000978:Antiparkinson Agents / Q000009:adverse effects; D006801:Humans; D019966:Substance-Related Disorders; D014282:Trihexyphenidyl / Q000009:adverse effects*
chemical_list: D000978:Antiparkinson Agents; D014282:Trihexyphenidyl