Livia, They are the same thing. Pegasys is a brand name for Pegylated interferon-alpha-2b. Pegylated interferon-alpha-2b is simply a longer lasting form of interferon-alpha-2b. The "PEG" in Pegylated stands for polyethylene glycol (PEG), which is added to prolong the effects of the interferon-alpha-2b so it only needs to be injected once a week, rather than three times each week for conventional interferon- alpha.
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