title: [Evaluation of unexpected and toxic effects of omeprazole (Mopral) reported to the regional centers of pharmacovigilance during the first 22 postmarketing months].
abstract: Omeprazole has been marketed in France since 1989, for the healing of peptic ulcers, erosive reflux esophagitis and the Zollinger Ellison syndrome. It is a proton pump inhibitor which inhibits the acid secretion in the stomach. In the majority of the clinical trials, omeprazole has been found to be well tolerated: headache, dizziness, skin rash, constipation have just been noted. Since September 1989, 143 adverse reactions have been reported to pharmacovigilance centres and Astra France: 37 neurological and psychiatric side effects, especially confusion in patients with hepatic diseases and/or advanced age; 35 cutaneous reactions, generally rash and urticaria; 22 hematological effects: leucopenia and agranulocytosis have been reported but the relation with omeprazole is very uncertain; 10 gastrointestinal effects, generally diarrhoea, nausea, vomiting and abdominal pain; 8 hepatic disorders, especially moderate elevation of aminotransferases. This study confirms the safety of this drug, during short treatment; the frequency of notified adverse effects is about 1/12 200 treatments of 4 weeks. The ministry of health, has decided, in november 1991, to inform the prescribers of this potential toxicity of omeprazole, particularly, of the risk of confusion, hepatotoxicity and leucopenia.
authors.affiliation: Centre de Pharmacovigilance, Hôpital Fernand Widal, Paris.
authors.forename: A
authors.initials: A
authors.lastname: Castot
authors.forename: I
authors.initials: I
authors.lastname: Bidault
authors.forename: R
authors.initials: R
authors.lastname: Dahan
authors.forename: M L
authors.initials: ML
authors.lastname: Efthymiou
mesh_terms: D000293:Adolescent; D000328:Adult; D016907:Adverse Drug Reaction Reporting Systems; D000368:Aged; D000369:Aged, 80 and over; D005069:Evaluation Studies as Topic; D005260:Female; D005602:France; D006801:Humans; D008297:Male; D008875:Middle Aged; D009853:Omeprazole / Q000009:adverse effects*; D011358:Product Surveillance, Postmarketing
chemical_list: D009853:Omeprazole
vernacular_title: Bilan des effets inattendus et toxiques de l'oméprazole (Mopral) rapportés aux centres régionaux de pharmacovigilance, au cours des 22 premiers mois de commercialisation.