Biogen/AbbVie MS Drug Zinbryta Approved; Faces Crowded Market, Liver Concerns

Biogen Inc. and AbbVie Inc. may have won the FDA's approval to market Zinbryta (daclizumab) as a treatment for multiple sclerosis, but the firms are facing significant barriers in marketing the drug, which is entering an already crowded field and coming to the marketplace with a black-box warning about serious adverse liver risks, limiting its sales potential.