Medicinal inorganic chemistry is a discipline of growing significance in both therapeutic and diagnostic medicine. The discovery and development of the cisplatin, and the second generation alternative carboplatin, the most widely used chemotherapeutic drugs worldwide for cancer, played a profound role in establishing the field of medicinal inorganic chemistry. The history and basic concept of medicinal inorganic chemistry have been recently reviewed. The field now encompasses active metal complexes, metal ions, and even metal binding compounds as potential agents. Metal ions can be introduced into a biological system either for therapeutic effect or as diagnostic aids. Alternatively, metal ion can be removed from a biological system by judicious use of metal binding molecules, termed ligands from the Latin word ligare, meaning that which binds.