Drug Information Online 

www.drugs.com

National Institute of Neurological Disorders and Stroke 

www.ninds.nih.gov/disorders/migraine/migraine.htm

Medline

www.nlm.nih.gov/medlineplus/ency/article/000709.htm

WebMD

www.webmd.com/migraines-headaches/default.htm

eMedicineHealth

www.emedicinehealth.com/migraine_headache/article_em.htm