Peginterferon beta-1a, known by its brand name Plegridy, is an approved treatment for relapsing and remitting forms of multiple sclerosis (RRMS). The drug is a “pegylated” form of interferon beta-1a, meaning polyethylene glycol (PEG) attaches to interferon molecules so as to enable them to maintain biologic effects for longer periods of time, allowing for less frequent dosing. It is an injectable formulation, administered subcutaneously, once every two weeks. Biogen Idec is responsible for clinical development and marketing of the drug in the United States and the European Union.
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