In many patients, but not all, these conditions get better after they stop taking PEGASYS (see the Medication Guide
for more information and Warnings).
, including COPEGUS®, can cause birth defects and/or death to an unborn baby. Female patients and the female partners of male patients should avoid getting pregnant. Ribavirin is known to cause anemia (low red blood cells), which can make heart disease worse (see the COPEGUS Medication Guide for more information and Warnings).