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Alferon N

Generic name: interferon alfa-n3IN-ter-FEER-on-AL-fa ]
Drug class: Interferons

Medically reviewed by on Jun 2, 2021. Written by Cerner Multum.

What is Alferon N?

Alferon N is used to treat genital warts in adults. Alferon N is for use only on the outside of the body.

Alferon N is usually given after other treatments have failed.

Alferon N may also be used for purposes not listed in this medication guide.


Call your doctor if your genital warts do not completely clear up within 3 months after your last injection of interferon alfa-n3.

Before taking this medicine

Tell your doctor if you have ever had:

Tell your doctor if you are pregnant or breastfeeding.

How is Alferon N given?

Alferon N is injected directly into each genital wart lesion, usually given 2 times per week for up to 8 weeks.

A healthcare provider will give you this injection.

Your lesions may only partially clear up after 8 weeks, but you may notice improvement even after your treatment ends.

Tell your doctor if your warts do not completely clear up within 3 months after your last injection.

What happens if I miss a dose?

Call your doctor for instructions if you miss an appointment for your Alferon N.

What happens if I overdose?

In a medical setting an overdose would be treated quickly.

What should I avoid while receiving Alferon N?

Follow your doctor's instructions about any restrictions on food, beverages, or activity.

Alferon N side effects

Get emergency medical help if you have signs of an allergic reaction (hives, chest tightness, wheezing, difficult breathing, swelling in your face or throat) or a severe skin reaction (fever, sore throat, burning eyes, skin pain, red or purple skin rash with blistering and peeling).

Alferon N may cause serious side effects. Call your doctor at once if you have:

  • chest pain or pressure;

  • a light-headed feeling, like you might pass out;

  • blurred vision;

  • a hoarse voice; or

  • low white blood cell counts--fever, mouth sores, skin sores, sore throat, cough.

Common side effects of Alferon N may include:

  • headache;

  • vomiting;

  • fever, chills, flu-like symptoms; or

  • joint or muscle pain.

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.

What other drugs will affect Alferon N?

Other drugs may affect Alferon N, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell your doctor about all other medicines you use.

Where can I get more information?

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.