KELFER 500MG The Kelfer drug contains Deferiprone as an active ingredient and is used for the treatment of excess iron in the blood and other conditions. Each Kelfer capsule contains Deferiprone 500 mg. Deferiprone is an oral iron chelator used as a second line agent in thalassemia syndromes when iron overload from blood transfusions occurs. Kelfer works by promoting iron removal from the body and preventing iron toxicity.