It has also improved on Rebetron with a drug called Peg-Intron, a "pegylated" combination of interferon and polyethylene glycol (Peg for short).

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Pegasys takes an old hepatitis C drug, interferon, and wraps it in a protective polymer coating of polyethylene glycol (PEG for short) that prevents the interferon from being broken down quickly in the body.

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But it also is an expert in polyethylene glycol (PEG) technology.

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