The initial and final serum ferritin concentrations in 25 patients who discontinued deferiprone therapy. (▵), Agranulocytosis; (---○), renal failure; (—•), increasing ferritin; (▪†), death; (┌), nausea; (—○), neutropenia; (□), tachycardia; (––•), anthropathy; (▴), went abroad; threshold of effective treatment: (▧), USA; (▨), WHO.