Could a Biogen medication be right for you?

Your healthcare provider is your best source of information, especially when choosing treatment. Together, you decide what treatment may work best for you. Download these questions to help get the conversation started at your next appointment.


Avonex Pen

AVONEX® is a once-a-week injectable treatment for relapsing forms of multiple sclerosis (MS).


What is AVONEX?

AVONEX® (interferon beta-1a) is approved by FDA to treat relapsing forms of multiple sclerosis (MS) to decrease the number of flare-ups and slow the occurrence of some of the physical disability that is common in people with MS. AVONEX is approved for use in people who have experienced a first attack and have lesions consistent with MS on their MRI.

How do I take AVONEX? Icon of an injection Once weekly

  • AVONEX is given once a week by injection into the muscle (intramuscular injection)
  • Inject AVONEX exactly as your healthcare provider tells you
  • Your healthcare provider will tell you how much AVONEX to inject and how often to inject AVONEX. Do not inject more than your healthcare provider tells you to
  • If you miss a dose, you should take your next dose as soon as you remember. You should continue your regular schedule the following week. Do not take AVONEX 2 days in a row
  • Do not change your dose unless your healthcare provider tells you to
  • Change (rotate) the injection site you choose with each injection. This will help decrease the chance that you will have an injection site reaction
  • Do not inject into an area of the body where the skin is irritated, reddened, bruised, infected, or scarred in any way
  • Always use a new, unopened AVONEX prefilled syringe, or single-use prefilled autoinjector pen for each intramuscular injection

During the start of your treatment, your doctor may recommend you build up to a full dose of AVONEX gradually over the first month. See Instructions for Use for complete dosing instructions.

How could AVONEX help me?

See how AVONEX was shown in clinical studies to impact:

  • Progression of physical disability
  • Relapses
  • MRI brain lesions

Who should not use AVONEX?

Do not take AVONEX if you are allergic to interferon beta, albumin (human), or any of the ingredients in AVONEX.

Find out more about AVONEX >

Proven results

Learn more about how AVONEX has been shown to treat relapsing forms of MS in clinical studies.

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Understanding Important Safety Information

Before taking any treatment, it’s important to understand as much about it as possible. The Important Safety Information for a treatment describes possible side effects you may experience. It also tells you what information you need to share with your doctor before starting treatment.

On this website, the Important Safety Information appears on each specific treatment page. You'll also find the Indication, which explains the specific condition that the medication was approved to treat by the FDA.