http://www.hopkinsmedicine.org/Press_releases/2009/07_22_09.html
"Researchers also found that in the third of study participants whose ribavirin dosage was reduced as a result of anemia, cure rates actually improved to as high as 52 percent, whereas in those whose ribavirin dose stayed the same, cure rates were lower, at 37 percent.
“Contrary to the prevailing belief that ribavirin dose reduction would lead to fewer people recovering from their infection, it actually increased the sustained viral response rate when reduction was used to manage treatment-related anemia,” says Sulkowski, who attributes the onset of anemia as a sign that the body had sufficient ribavirin to fight off the infection.
“Our study shows that in infected people having difficulty tolerating standard dose therapy with peginterferon alfa, we can safely reduce their medication levels,” he says."