DrugDigest: Avonex
- Information on dosage, usage, side effects, interactions, and drug comparisons, including generics when available.
- http://www.drugdigest.org/DD/DVH/Uses/0,3915,892%7CAvonex,00.html

MedlinePlus: Interferon beta-1a Intramuscular Injection
- Provides information about dosage, usage, warnings, and side effects.
- http://www.nlm.nih.gov/medlineplus/druginfo/medmaster/a693040.html

MS Pathways
- From Berlex. Offers drug and disease information for US residents.
- http://www.mspathways.com

Society for Neuroscience: Beta Interferon and Multiple Sclerosis
- Describes how Beta interferon corrects a deficiency in cells that control the immune system. Includes detailed graphics.
- http://web.sfn.org/content/Publications/BrainBriefings/ms.html

National MS Society (USA): Rebif
- Beta-Interferon 1A (Rebif) in the treatment of MS
- http://www.nationalmssociety.org/Meds-InterferonBeta1aRib.asp

National MS Society (USA): Betaseron
- Beta-Interferon 1b use in the treatment of multiple sclerosis.
- http://www.nationalmssociety.org/Meds-InterferonBeta1b.asp

National MS Society (USA): Avonex
- Beta-Interferon 1A use in the treatment of multiple sclerosis.
- http://www.nationalmssociety.org/Meds-InterferonBeta1aAvo.asp

Rebif
- An interferon beta 1-a for relapsing forms of MS. Find out about recommended dose, potential side effects, clinical studies and proper self-injection technique. Official site by the manufacturer.
- http://www.rebif.com/

DrugDigest: Interferon Beta 1-a Injection
- Information on dosage, usage, side effects, interactions, and drug comparisons, including generics when available.
- http://www.drugdigest.org/DD/DVH/Uses/0,3915,892%7CInterferon%2BBeta%252D1a%2BInjection,00.html

Interferon beta-1a
- Information from the RxList.
- http://www.rxlist.com/cgi/generic2/interferon.htm

Interferon beta-1b
- Information from the RxList.
- http://www.rxlist.com/cgi/generic/interferon_beta.htm

Betaseron
- Features product information, news, FAQs, and multiple sclerosis resources.
- http://www.betaseron.com/

Avonex
- Interferon beta-1a. Details about this Multiple Sclerosis prescription drug treatment. Research and information on symptoms and diagnosis. Includes FAQs and a MS resource center.
- http://www.avonex.com/