Nervous System Home > Interferon Beta-1b

Interferon beta-1b is a prescription drug that is licensed for the treatment of multiple sclerosis (MS). It is injected just under the skin every other day. Studies show that people who took the medication had fewer MS exacerbations and had significantly fewer lesions after taking interferon beta-1b for two years. Potential side effects of interferon beta-1b include flu-like symptoms, weakness, and headaches.

What Is Interferon Beta-1b?

Interferon beta-1b (Betaseron®, Extavia®) is a prescription medication approved for the treatment of multiple sclerosis (MS). It is injected subcutaneously (just under the skin) every other day.
(Click What Is Interferon Beta-1b Used For? for more information on interferon beta-1b uses, including possible off-label uses.)

Interferon Beta-1b Side Effects

As with any medicine, side effects are possible with interferon beta-1b. However, not everyone who takes the drug will experience side effects. In fact, most people tolerate it quite well. If side effects do occur, in most cases, they are minor and either require no treatment or can easily be treated by you or your healthcare provider. Serious side effects are less common.
Common side effects of interferon beta-1b include, but are not limited to:
  • Skin reaction at the injection site (such as redness, pain, or burning)
  • Weakness
  • Headaches
  • Flu-like symptoms (such as fever, chills, or muscle aches).
(Click Side Effects of Interferon Beta-1b to learn more, including potentially serious side effects that you should report immediately to your healthcare provider.)
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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