In this study, the investigators will study both DOT and PN models for treating HCV in PWID. The investigators' goal is to find out which model produces the best results and is preferred by patients. Up to 1,000 HCV-infected PWID will participate in the study in eight sites around the country. Patients will be randomized into either the PN or the DOT groups. Patients who end up in the PN group will get a biweekly blister pack of medication to take home. Their PN will provide education and support. The investigators will find out whether patients adhered to medication using an electronic adherence monitoring system. Patients who are randomly assigned to the DOT group will take their medication in front of a staff member.