May 22, 2017
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Infergen Patient Information Including Side Effects

Brand Names: Infergen

Generic Name: interferon alfacon-1 (Pronunciation: IN ter FEER on AL fa kon 1)

What is interferon alfacon-1 (Infergen)?

Interferon alfacon-1 is made from human proteins. Interferons help the body fight viral infections.

Interferon alfacon-1 is used to treat chronic hepatitis C.

Interferon alfacon-1 may also be used for purposes not listed in this medication guide.

What are the possible side effects of interferon alfacon-1 (Infergen)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using interferon alfacon-1 and call your doctor at once if you have a serious side effect such as:

  • severe depression, aggressive behavior, or thoughts of hurting yourself;
  • fever, chills, sore throat, body aches, flu symptoms;
  • easy bruising, unusual bleeding (nose, mouth, vagina, or rectum);
  • feeling like you might pass out;
  • fast, pounding, or uneven heartbeats;
  • increased urination, pain or burning when you urinate;
  • bloody diarrhea;
  • cough with yellow or green mucus, feeling short of breath;
  • chest pain, pain spreading to the arm or shoulder, nausea, sweating, general ill feeling;
  • sudden numbness or weakness, headache, confusion, or problems with vision, speech, or balance;
  • worsening liver symptoms such as severe stomach pain, jaundice (yellowing of the skin or eyes);
  • pancreatitis (severe pain in your upper stomach spreading to your back, nausea and vomiting, fast heart rate);
  • thyroid problems (trouble concentrating, feeling too hot or cold, weight changes); or
  • high blood sugar (increased thirst, fruity breath odor, increased urination, drowsiness, dry skin, nausea, and vomiting).

Less serious side effects may include:

  • mood changes, feeling irritable, nervous, or anxious;
  • mild headache, tired feeling;
  • numbness, tingling, or pain in your hands or feet;
  • joint or muscle pain, back pain;
  • mild stomach pain or nausea, diarrhea; or
  • weight loss or thinning hair.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Read the Infergen (interferon alfacon-1) Side Effects Center for a complete guide to possible side effects

What is the most important information I should know about interferon alfacon-1 (Infergen)?

You should not use this medication if you are allergic to interferons, or if you have autoimmune hepatitis, severe liver problems from causes other than hepatitis C, severe kidney disease, or a hemoglobin blood cell disorder such as sickle cell anemia or thalasssemia.

Interferon alfacon-1 is sometimes used together with another drug called ribavirin. Ribavirin can cause birth defects or death in an unborn baby. If you are a woman, do not take ribavirin if you are pregnant. If you are a man, do not take ribavirin if your female sexual partner is pregnant. An unborn baby could also be harmed if a man fathers the child while he is taking ribavirin.

Before using interferon alfacon-1, tell your doctor if you have other liver problems (including hepatitis B), kidney disease, diabetes, pancreatitis, cancer, bone marrow suppression, HIV or AIDS, a bleeding or blood clotting disorder, numbness or circulation problems, a thyroid disorder, problems with your eyes, a breathing disorder, an intestinal disorder, high triglycerides, heart problems, high blood pressure, an autoimmune disorder, a history of organ transplant, a history of heart attack or stroke, or a history of depression, mental illness, suicidal thoughts, or drug or alcohol addiction.

Tell your doctor if you use any medications that weaken your immune system, such as cancer medicine, steroids, medicines to treat autoimmune disorders, or medicines to prevent organ transplant rejection.

Interferon alfacon-1 can cause serious side effects, some of which may be life-threatening. However, the benefits of treating your condition may outweigh any risks posed by using interferon alfacon-1. Talk to your doctor about the risks and benefits of using this medication.

Side Effects Centers

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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