A composition in the form of an injectable aqueous solution, the pH of which is comprised from 6.0 to 8.0, including at least:a) amylin, an amylin receptor agonist or an amylin analogue；b) a co-polyamino acid bearing carboxylate charges and hydrophobic radicals Hy, said co-polyamino acid being constituted of glutamic or aspartic units and said hydrophobic radicals Hy being according to formula I below:*GpRrGpAaGpC)p ； ；Formula Iwherein the composition does not comprise a basal insulin the isoelectric point pI of which is comprised from 5.8 to 8.5. It also relates to a composition wherein it further includes prandial insulin.
