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/

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

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

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

DrugDigest: Interferon Beta-1a  
   Information on dosage, usage, side effects, interactions, and drug comparisons, including generics when available.
   http://www.drugdigest.org/DD/DVH/Uses/0,3915,551050|Interferon%2BBeta%252D1a,00.html

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|Interferon%2BBeta%252D1a%2BInjection,00.html

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/

National MS Society (USA): Avonex  
   Beta-Interferon 1A use in the treatment of multiple sclerosis.
   http://www.nationalmssociety.org/Meds-InterferonBeta1aAvo.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): Rebif  
   Beta-Interferon 1A (Rebif) in the treatment of MS
   http://www.nationalmssociety.org/Meds-InterferonBeta1aRib.asp

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

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