Outpatient drug-induced parenchymal liver disease requiring hospitalization.

A case-history study of drug-induced liver disorders requiring hospitalization was carried out at the Group Health Cooperative of Puget Sound, a health maintenance organization with about 280,000 members, for the five-year period from January 1, 1977 to December 31, 1981. During this time, there were 12 instances of hospitalization for liver disorders judged to be probably (nine cases) or possibly (three cases) attributable to outpatient drug ingestion (other than antitumor agents). The rate was on the order of one per 100,000 person-years at risk. Drugs implicated as probable causes were ampicillin (two cases), carbamazepine (one case), erythromycin (one case), methyldopa (one case), sulfasalazine (one case), quinidine (one case), trimethoprim/sulfamethoxazole (one case), and multiple drugs (one case).