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Multiple Sclerosis, Vol. 10, No. 3, 298-301 (2004)
DOI: 10.1191/1352458504ms1007oa
© 2004 SAGE Publications

Elevated aminotransferases during treatment with interferon-beta for multiple sclerosis: actions and outcomes

Helen L Tremlett

University of British Columbia and Department of Medicine, Division of Neurology, Vancouver Hospital and Health Sciences Center, UBC Site, S159-2211 Wesbrook Mall, Vancouver, BC, Canada V6T 2B5, tremlett{at}interchange.ubc.ca

Joel Oger

University of British Columbia and Department of Medicine, Division of Neurology, Vancouver Hospital and Health Sciences Center, UBC Site, S159-2211 Wesbrook Mall, Vancouver, BC, Canada V6T 2B5

The authors report further analysis of a six-year retrospective chart review of multiple sclerosis (MS) patients prescribed interferon-beta (IFNB) in British C olumbia, C anada. A ctions and outcomes taken when 284/835 (34%) of the patients developed de novo elevated aminotransferases are presented; 239/284 (84%) of patients were continued on treatment despite these elevations; 216/246 (88%) of patients reaching grade 1 toxicity (greater than the upper limit of normal) continued IFNB treatment; of these, 167/216 (77%) returned to within normal limits. O f the 22/29 (76%) reaching grade 2 toxicity (> 2.5 times the upper limit of normal) and continuing treatment, 14/22 (64%) returned to within the normal range. O ne of the nine patients reaching grade 3 toxicity (> 5 times the upper limit of normal) was allowed continue treatment and their aminotransferase levels returned to within normal limits. However, one patient reaching grade 3 toxicity went on to develop liver failure (previously reported).

Key Words: adverse drug reaction • aminotransferase • interferon-beta • liver • multiple sclerosis • pharmacovigilance


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