title: [Drug-induced parkinsonian syndromes: a 10-year experience at a regional center of pharmaco-vigilance].
abstract: Besides classical neuroleptics, several drugs can induce parkinsonian symptoms. The present retrospective study investigates the characteristics of drug-induced parkinsonism notified to the Midi-Pyrénées Pharmacovigilance Centre between 1983 and 1992. Among 3,923 side effects spontaneously reported between 1983 and 1992 to the center, 53 (1.4%) were drug-induced parkinsonism. Mean age was 65 +/- 2 (s.e.m.) years (range 21-88). Drug-induced parkinsonism appeared after a mean treatment duration of 473 +/- 142 days (range 1 day to 15 years) and occurred most frequently in women (63%). The occurrence onset of drug-induced Parkinsonism exhibited a bimodal pattern with a first peak (between 0 and 6 months) mainly due to peripheral or central antidopaminergic drugs and a second one later (between 9 and 12 months) due mostly to calcium channel blockers. Involved drugs were mostly antidopaminergic agents: neuroleptics (antipsychotic drugs: 39%) but also agents used for nausea or vomiting (domperidone, metoclopramide, metopimazine or triethylperazine: 12%) or symptoms associated with menopause (veralipride: 6%). Other cases were related mainly to drugs with "calcium channel blocker" properties (flunarizine and cinnarizine: 30%), H1 antihistamine (1 case), fluoxetine (1 case), alphamethyldopa (1 case) or reserpine (1 case) whereas 3 cases were due to drug interactions. Imputability scores (according to the method of assessment of unexpected drug reactions used in France) were "doubtful" (11%), "plausible" (34%) and "probable" (53%). The complete triad (tremor, akinesia plus rigidity) was seen in 13 (25%) cases. Symmetrical symptoms occurred in 41 (77%) patients. A total disappearance of the clinical feature occurred in 39 (74%) patients whereas in 8 cases (15%), drug-induced parkinsonism led to the diagnosis of underlying idiopathic Parkinson's disease. The present study shows that around 80% of drug-induced parkinsonism are due to two pharmacological classes: central and peripheral antidopaminergic agents and calcium channel blockers.
authors.affiliation: Service de Pharmacologie Clinique, Centre Hospitalier Universitaire, Faculté de Médicine, Toulouse.
authors.forename: M E
authors.initials: ME
authors.lastname: Llau
authors.forename: L
authors.initials: L
authors.lastname: Nguyen
authors.forename: J M
authors.initials: JM
authors.lastname: Senard
authors.forename: O
authors.initials: O
authors.lastname: Rascol
authors.forename: J L
authors.initials: JL
authors.lastname: Montastruc
mesh_terms: D000328:Adult; D016907:Adverse Drug Reaction Reporting Systems; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging; D014150:Antipsychotic Agents / Q000009:adverse effects; D002121:Calcium Channel Blockers / Q000009:adverse effects; D018492:Dopamine Antagonists / Q000009:adverse effects; D004347:Drug Interactions; D005260:Female; D005602:France; D006801:Humans; D008297:Male; D008875:Middle Aged; D010302:Parkinson Disease, Secondary / Q000139:chemically induced*; D012189:Retrospective Studies
chemical_list: D014150:Antipsychotic Agents; D002121:Calcium Channel Blockers; D018492:Dopamine Antagonists