Interferon Beta-1b Injection

Name: Interferon Beta-1b Injection

What should I do if I forget a dose?

If you miss a dose of interferon beta-1b injection, inject your next dose as soon as you remember or are able to give it. Your next injection should then be given about 48 hours (2 days) after that dose. Do not use interferon beta-1b injection two days in a row. Do not inject a double dose to make up for a missed dose. Call your doctor if you miss a dose and have questions about what to do.

What side effects can this medication cause?

Interferon beta-1b injection may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

  • headache
  • vaginal bleeding or spotting between menstrual periods
  • tight muscles
  • weakness
  • changes in sex drive or ability (in men)
  • change in coordination

Some side effects can be serious. If you experience any of these symptoms or any of the symptoms listed in the SPECIAL PRECAUTIONS section, call your doctor immediately or get emergency medical treatment:

  • bruising, pain, redness, swelling, or tenderness at the injection site
  • blackening of skin or drainage at the injection site
  • yellowing of the skin or eyes
  • dark urine
  • extreme tiredness
  • pale stool
  • nausea
  • vomiting
  • loss of appetite
  • unusual bruising or bleeding
  • confusion
  • irritability
  • nervousness
  • difficulty falling asleep or staying asleep
  • thinking about harming or killing yourself or planning or trying to do so
  • anxiety
  • new or worsening depression
  • aggressive or violent behavior
  • seeing things or hearing voices that do not exist
  • acting without thinking
  • seizures
  • shortness of breath
  • fast or abnormal heartbeat
  • chest pain or tightness
  • pale skin
  • increased urinary frequency, especially at night
  • rash
  • hives
  • itching
  • swelling of the eyes, face, mouth, tongue, throat, hands, arms, feet, ankles, or lower legs
  • difficulty breathing or swallowing
  • red or bloody stools or diarrhea
  • stomach pain
  • slow or difficult speech
  • purple patches or pinpoint dots (rash) on the skin
  • decreased urination or blood in the urine

Interferon beta-1b injection may cause other side effects. Call your doctor if you have any unusual problems while receiving this medication.

If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online (http://www.fda.gov/Safety/MedWatch) or by phone (1-800-332-1088).

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