Interferon beta-1a

Generic name: interferon beta-1a [ in-ter-FEAR-on-BAY-ta ]
Brand names: Avonex, Rebif, Avonex Prefilled Syringe, Avonex Pen, Rebif Rebidose
Dosage forms: intramuscular kit (30 mcg/0.5 mL); intramuscular powder for injection (30 mcg); subcutaneous kit (-); subcutaneous solution (22 mcg/0.5 mL; 44 mcg/0.5 mL)
Drug class:Interferons

Medically reviewed by Drugs.com on Jul 27, 2020. Written by Cerner Multum.

What is interferon beta-1a?

Interferon beta-1a is used to treat relapsing forms of multiple sclerosis in adults (including clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive disease).

interferon beta-1a will not cure MS, it will only decrease the frequency of relapse symptoms.

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

Warnings

Interferon beta-1a can harm your liver. Call your doctor if you have symptoms such as nausea, loss of appetite, tiredness, confusion, easy bruising or bleeding, dark urine, clay-colored stools, or yellowing of your skin or eyes.

Some people have thoughts about suicide while using interferon beta-1a. Stay alert to changes in your mood or symptoms. Report any new or worsening symptoms to your doctor.

Before taking this medicine

You should not use interferon beta-1a if you are allergic to natural or recombinant interferon beta or albumin.

Tell your doctor if you have ever had:

• bleeding problems or a blood clot;

• depression, mental illness, or suicidal thoughts or actions;

• liver disease;

• bleeding problems;

• low blood cell counts;

• heart disease;

• a thyroid disorder;

• a latex allergy;

• an autoimmune disorder such as rheumatoid arthritis, lupus, or psoriasis;

• a seizure; or

• if you drink alcohol.

Some brands of interferon beta-1a contain donated human plasma and may contain viruses or other infectious agents. Donated plasma is tested and treated to reduce the risk of contamination, but there is still a small possibility it could transmit disease. Ask your doctor about any possible risk.

Tell your doctor if you are pregnant or plan to become pregnant, or if you are breastfeeding.

Interferon beta-1a is not approved for use by anyone younger than 18 years old.

How should I use interferon beta-1a?

Follow all directions on your prescription label and read all medication guides or instru...