Drugs causing neutropenia or agranulocytosis
- A comprehensive list of various drugs that may cause neutropenia by MedicineWorld.org
- http://medicineworld.org/physicians/hematology/neutropenia.html

MedicineNet: Neutropenia
- Presents the causes, normal and abnormal white blood cell counts, and conditions associated with the disorder.
- http://www.medicinenet.com/neutropenia/article.htm

Neutropenia OnLine
- Register, become a member and participate in a forum about this disorder.
- http://login.prospero.com/dir-login/index.asp?getDPref=0&webtag=NEUTROPENIA&lgnDST=http%3A%2F%2Fwww%2Edelphi%2Ecom%2Fneutropenia%2Fstart%2F

Neutropenia Support Association
- An extensive look at this disorder with information about the blood, the causes, the different types, symptoms and the treatment.
- http://www.neutropenia.ca

Severe Chronic Neutropenia International Registry
- A disease registry which was established in Australia, Canada, the European Community and the United States in March, 1994. Information for patients and families and health care providers.
- http://depts.washington.edu/registry/