Biogen's only drug, the multiple sclerosis fighter Avonex, is under heavy fire from Serono's Rebif.
FORBES: Skin Deep
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Additionally, adverse events like diarrhea, hair thinning and back pain were more common in patients treated with Rebif.
FORBES: European Pharma Stocks Hit on Bad News
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There's a new competing drug just out called Rebif from Swiss biotech outfit Serono, which has teamed up with pharmaceutical marketing powerhouse Pfizer.