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This medication can rarely cause or worsen serious (rarely fatal) medical conditions, including mental/mood conditions (such as depression), immune system problems (autoimmune conditions such as lupus or rheumatoid arthritis), circulation problems, or infections. If your medical history includes any of these conditions, tell your doctor promptly. Also, tell your doctor right away if any serious symptoms or side effects occur (see Side Effects section). This medication may be combined with ribavirin to treat chronic hepatitis C. Ribavirin may cause harm to an unborn baby or death. Women must avoid pregnancy while they or their male partners are using ribavirin. Ribavirin may cause a blood disorder (hemolytic anemia), which can worsen heart disease. If you are using this medication with ribavirin to treat chronic hepatitis C, also carefully read the drug information for ribavirin.

Injection site reactions (pain/swelling/redness), headache, tiredness, diarrhea, upset stomach, loss of appetite, back pain, dizziness, dry mouth, taste changes, nausea, or vomiting may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. Flu-like symptoms such as fever, chills, and muscle aches may occur, especially when you first start this medication. These symptoms usually last about 1 day after the injection and improve or go away after a few weeks of continued use. You can reduce these side effects by injecting this medicine at bedtime and using a fever reducer/pain reliever such as acetaminophen before each dose. Consult your doctor or pharmacist for more information. Tooth and gum problems may sometimes occur during treatment. Having a dry mouth can worsen this side effect. Prevent dry mouth by drinking plenty of water or using a saliva substitute. Brush your teeth well at least twice a day and have regular dental exams. If you experience vomiting during treatment, rinse your mouth afterwards to lessen the chance of tooth and gum problems. Temporary hair loss may occur. Normal hair growth should return after treatment has ended. Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Tell your doctor right away if you have any serious side effects, including: nausea/vomiting that doesn't stop, feeling too hot or cold (more than others around you), fast/irregular heartbeat, increased thirst/urination, menstrual changes (absent/delayed/irregular periods), numbness/tingling of hands/feet, swelling (especially of face/hands/feet), trouble sleeping, trouble walking, vision changes (such as blurred vision, partial loss of vision), easy bleeding/bruising, signs of infection (such as sore throat that doesn't go away, fever), stomach/abdominal pain, dark urine, black/tarry stools, yellowing eyes/skin. Get medical help right away if any of these very serious side effects occur: chest pain, seizures, weakness on one side of the body, trouble speaking. This drug may cause you to develop serious mental/mood changes that may get worse during treatment or after your last dose. Tell your doctor right away if you have symptoms such as confusion, depression, thoughts of suicide or hurting others, unusual irritability, or aggressive behavior. If this occurs, psychiatric therapy and monitoring is recommended during and after treatment with this medication. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Some products that may interact with this drug include: barbiturates (such as phenobarbital), colchicine, drugs that may affect your immune system (such as cancer chemotherapy, aldesleukin, cyclosporine), hydroxyurea, telbivudine, theophyllines (such as aminophylline, theophylline).