interferon beta-1b (Betaseron, Extavia) (cont.)

Pharmacy Author:
Medical and Pharmacy Editor:


Possible serious side effects include:

PREPARATIONS: Powder for injection (single use vial): 0.3 mg/vial

DRUG INTERACTIONS: Combining interferon beta-1b with zidovudine (Retrovir) may increase blood levels of zidovudine and the risk of bone marrow suppression.


  • Use of interferon beta-1b has not been adequately evaluated in pregnant women. Due to the lack of conclusive safety data, interferon beta-1b should be used in pregnancy only if the potential benefit justifies the potential risk to the fetus.
  • It is not known if interferon beta-1b is excreted in breast milk. As many drugs enter breast milk and can potentially cause harm to the nursing infant, interferon beta-1b should be used cautiously in nursing mothers.
Medically Reviewed by a Doctor on 6/15/2016

Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

Pill Finder Tool

Need help identifying pills and medications?
Use the pill identifier tool on RxList.

Back to Medications Index

Health Solutions From Our Sponsors