title: Isoniazid hepatotoxicity among drug users: the role of hepatitis C.
abstract: The incidence of and risk factors associated with hepatotoxicity in patients with chronic hepatitis have not been systematically studied. Therefore, we conducted a prospective study that included former drug users who were treated with isoniazid for latent tuberculosis infection. Of 415 patients, 20 (4.8%; 95% confidence interval [CI], 3-7.4) had hepatotoxicity diagnosed, and 6 (1.4%; 95% CI, 0.5-3.2) developed clinical hepatitis, none of whom had serious symptoms. The only 2 factors independently associated with isoniazid hepatotoxicity were excessive alcohol consumption (odds ratio [OR]; 4.2, 95% CI, 1.6-10.8; P=.002) and a high baseline alanine transaminase level (OR, 4.3; 95% CI, 1.6-11.4; P=.002). The presence of hepatitis C virus antibodies was associated with hepatotoxicity only on univariate analysis. Treatment with isoniazid in drug users appears to be safe and well tolerated, although frequent asymptomatic elevations in transaminase levels were observed.
authors.affiliation: Unidad de Tuberculosis, Hospital Nicolás Peña, Vigo, Spain. jfv01po@saludalia.com
authors.forename: Alberto
authors.initials: A
authors.lastname: Fernández-Villar
authors.forename: Bernardo
authors.initials: B
authors.lastname: Sopeña
authors.forename: Rafael
authors.initials: R
authors.lastname: Vázquez
authors.forename: Fernando
authors.initials: F
authors.lastname: Ulloa
authors.forename: Enrique
authors.initials: E
authors.lastname: Fluiters
authors.forename: Mar
authors.initials: M
authors.lastname: Mosteiro
authors.forename: César
authors.initials: C
authors.lastname: Martínez-Vázquez
authors.forename: Luis
authors.initials: L
authors.lastname: Piñeiro
mesh_terms: D000293:Adolescent; D000328:Adult; D000995:Antitubercular Agents / Q000009:adverse effects* / Q000627:therapeutic use; D005260:Female; D006526:Hepatitis C / Q000150:complications* / Q000201:enzymology; D006801:Humans; D007538:Isoniazid / Q000009:adverse effects* / Q000627:therapeutic use; D008099:Liver / Q000187:drug effects*; D008297:Male; D008875:Middle Aged; D019966:Substance-Related Disorders / Q000150:complications*; D000637:Transaminases / Q000378:metabolism
chemical_list: D000995:Antitubercular Agents; D000637:Transaminases; D007538:Isoniazid