Compositions comprising the succinate salt of 2-[6-(3-Amino-piperidin-1-yl)-3-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-ylmethyl]-4-fluoro-benzonitrile (referred to herein as Compound I) which has the formula: wherein the Compound I is present in one or more polymorphic forms. Also provided are novel methods for the preparation of the polymorphs of Compound I, and kits and articles of manufacture of the compositions, and methods of using the compositions to treat various diseases.
