I'm on 1200 mg of ribavirin daily (along with interferon), at 17 weeks of treatment. When I started treatment, my Hgb was well over 13, then fell into the 12s, then 11s, then 10s, back into the 11s, back down to the 10s. The labs I had drawn yesterday show Hgb at 9.8.
I weigh about 115 lbs (52 kg). According to weight-based guidelines, only 1000 mg (or even 800) of ribavirin would be recommended for someone my size.