Patent ID: 7820676

Claim:
A dry powder therapeutic composition comprising: a pharmaceutically acceptable anion of a heterocyclic compound according to Formula 1: wherein R 1 and/or R 2 comprise a terminal carboxlate functional group and E 1 and E 2 are NH such that said anion is selected from the group consisting of 3,6-di(succinate-4-aminobutyl)-2,5-diketopiperazine, 3,6-di(maleate-4-aminobutyl)-2,5-diketopiperazine, 3,6-di(fumarate-4-aminobutyl)-2,5-diketopiperazine and 3,6-di(glutamate-4-aminobutyl)-2,5-diketopiperazine; and at least one cation; and a biologically active agent; and wherein said dry powder therapeutic composition is formed by spray drying.