Guanosine 5′-diphosphate (GDP) disodium salt, a purine nucleoside diphosphate, is interconverted to guanosine by the action of exonucleotidase and phosphorylation of nucleoside to guanine. Guanosine 5′-diphosphate disodium salt activates adenosine 5′-triphosphate-sensitive K+ channel and is used to study the kinetics and characteristics of GTPases such as those associated with G-protein coupled receptors (GPCR). Guanosine 5′-diphosphate disodium salt is a potential iron mobilizer, which prevents the Hepcidin (HY-P70400)-ferroportin interaction and modulates the interleukin-6 (IL-6)/stat-3 pathway. Elevated levels of guanosine 5’-diphosphate are associated with the pathogenesis of neurological diseases. Guanosine 5′-diphosphate disodium salt