Drug Any substance which when absorbed into a living organism may modify one or more of its functions. The term is generally accepted for a substance taken for a therapeutic purpose, but is also commonly used for abused substances. SCDO:1000200 Sufficient Add sub-class "Iron Chelator" with sub-classes "Deferoxamine" and "Deferiprone" (see wikipedia page for "Beta Thalassemia"...mentions how they're used to treat beta thalassemia major). Also add "Deferoxamine" and "Deferiprone" below "Iron Chelation Therapy". CHEBI:23888 Therapeutics