Flu-like symptoms (including fever, chills, muscle aches, joint pain, headaches)
Tiredness
Upset stomach (like nausea, taste changes, diarrhea)
Blood sugar problems (may lead to diabetes)
Skin problems (like rash, dry or itchy skin, redness and swelling at injection
site)
Hair loss (temporary)
Trouble sleeping
Risks to pregnancies
Mental
health problems (such as irritability, depression, anxiety, aggressiveness, trouble
with drug addiction or overdose, thoughts about suicide, suicide attempts, suicide
and thoughts about homicide)
Blood problems (like a drop in blood cells leading to increased risk for infections,
bleeding and/or heart or circulatory problems)
Infections (which sometimes cause death)
Lung problems (like trouble breathing,
pneumonia)
Eye problems (like
blurred vision, loss of vision)
Autoimmune problems (such as psoriasis, thyroid problems)
Heart problems (including chest pain and, rarely, a heart attack)
Liver problems (rarely, liver function worsens). Patients with both the hepatitis
C virus and HIV can have an increased chance of having liver failure during PEGASYS
treatment. Change in a blood test that measures liver inflammation occurs more
often in patients with hepatitis B. If you have a rise in this blood test you
may need to be watched more closely with additional blood tests.