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This medication is used in combination with interferon to treat chronic hepatitis C infection. Hepatitis C is a viral infection that causes swelling or enlargement of the liver.

This medication may cause birth defects and/or fetal death when used during pregnancy. Women of childbearing potential and their male partners must use two forms of reliable birth control (contraception such as latex condoms, birth control medication) while taking this medication and for 6 months after treatment ends to avoid pregnancy. Consult your doctor or pharmacist for additional information.

Nausea, vomiting, headache, dizziness, blurred vision, stomach upset, trouble sleeping, and flu-like symptoms (e.g., fever, chills, sore throat, muscle aches) may occur. If any of these effects persist or worsen, notify your doctor. Tell your doctor immediately if any of these side effects occur: hair loss, loss of appetite, weight loss, rash, itching. Tell your doctor immediately if any of these serious side effects occur: unusual tiredness and weakness (fatigue), dark urine, yellowing eyes, mental/mood changes (including severe depression or suicidal thoughts), trouble breathing. Tell your doctor immediately if any of these unlikely but serious side effects occur: chest pain, muscle pain, joint pain, rapid breathing, stomach pain, easy bruising or unusual bleeding. An allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of an allergic reaction include: severe rash, severe itching, swelling, severe dizziness, trouble breathing. If you notice other effects not listed above, contact your doctor or pharmacist.