Abstract: A co-crystal composition comprised of Quercetin and at least one antidiabetic agent acts as a combination drug having unique physical properties and biological activity, which differ from both Quercetin in pure form and the at least one antidiabetic agent in pure form. The co-crystal composition may comprise quercetin and metformin. The co-crystals of quercetin and metformin may be prepared by grinding the compounds, and used in pharmaceutical compositions comprising these co-crystals. Co-crystal compositions of quercetin and Metformin may be used in combination with other anti-diabetic agents, including DPP-IV inhibitors.

Abstract: Disclosed herein is synergistic pharmaceutical co-crystals composition comprising Quercetin and an antidiabetic agent(s) as combination drug that have unique physical properties and biological activity which differ from the active agent in pure form. The invention further discloses process for preparation of the same and pharmaceutical compositions comprising these synergistic co-crystals.