American Porphyria Foundation: Aims to educate and support patients and families affected by porphyrias and to support research into treatment and prevention of porphyrias American Porphyria Foundation: Safe / Unsafe Drug Database: Provides an up-to-date list of medications available in the United States to assist physicians in prescribing for patients with porphyrias United Porphyrias Association: Provides education and support to patients and their families; provides reliable information to health-care providers; fosters and supports clinical research to improve diagnosis and management of the porphyrias European Porphyria Network: Promotes clinical research about porphyrias The Drug Database for Acute Porphyrias: Provides an up-to-date list of medications available in Europe to assist physicians in prescribing for patients with porphyrias