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. Neutropenia Support Association - A look at this disorder with information about the blood, the causes, the different types, symptoms and the treatment. MedicineNet: Neutropenia - Presents the causes, normal and abnormal white blood cell counts, and conditions associated with the disorder. Drugs Causing Neutropenia or Agranulocytosis - A list of various drugs that may cause neutropenia provided by MedicineWorld.org. Medicine On-Line: Agranulocytosis Induced by Vinpocetine - A case report about drug-induced agranulocytosis, a life-threatening disorder that leads to a selective profound granulocytopenia. National Neutropenia Network - Aims to coordinate efforts to promote awareness and education about neutropenia and provides a support system for individuals and families affected. eMedicine.com: Agranulocytosis - Medical presentation of agranulocytosis written by a specialist. Includes information about its causes, related mortality and morbidity, the appropriate treatment and links to other resources. Patient: Neutropenic Patients and Neutropenic Regimes - Factsheet for doctors on how to approach a patient with neutropenia, and other management issues.