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Extavia Side Effects

Insomnia, weakness, and headaches were some of the common side effects reported during clinical studies with Extavia. Problems that were reported in postmarketing experience included weight loss, pneumonia, and anemia. While most side effects of Extavia are mild, you should seek prompt medical attention if you experience chest pain, frequent infections, depression, or other serious problems.

An Introduction to Extavia Side Effects

As with any medicine, side effects are possible with Extavia® (interferon beta-1b). However, not everyone who takes the medication will have problems. 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 be treated easily by you or your healthcare provider.
(This article covers many, but not all, of the possible side effects with Extavia. Your healthcare provider can discuss a more complete list of Extavia side effects with you.)

Common Side Effects of Extavia

Extavia was approved based on clinical studies done using Betaseron®, another interferon beta-1b medication that is equivalent to Extavia for most intents and purposes.
In these studies, the side effects that occurred in a group of people taking Betaseron were documented and compared to those that occurred in a group of people taking a placebo (a similar-looking injection with no active ingredient). This way, it was possible to see what side effects occurred, how often they appeared, and how they compared to the group not taking the medicine.
In these studies, the most common side effects included:
  • Skin reactions at the injection site (such as redness or pain) -- in up to 78 percent of people
  • Flu-like symptoms (such as fever, chills, or muscle aches) -- up to 57 percent
  • Weakness -- up to 53 percent
  • Headaches -- up to 50 percent
  • Pain -- up to 42 percent
  • Muscle pain -- up to 23 percent
  • Insomnia -- up to 21 percent.
Other common side effects (occurring in 4 to 20 percent of people) included:
  • Coordination problems
  • Abdominal pain (stomach pain)
  • An urgent need to urinate
  • Irregular menstrual bleeding
  • Impotence (also known as erectile dysfunction, or ED)
  • A general ill feeling (malaise).
Know the Signs - Concussion Safety

Extavia Medication Information

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