Patent ID: 8735422

Claim:
A cationic pharmaceutically active ingredient containing composition comprising: (a) about 0.0001 wt. % to about 5 wt. % cationic pharmaceutically active ingredient comprising an aromatic amine or a salt of an aromatic amine; (b) at least about 3 wt. % of a hydrophobic polymer/hydrophilic polymer adduct comprising a poly(vinylpyrrolidone-alkylene) polymer and a polymer comprising carboxylic acid groups, hydroxyl groups, or mixture of carboxylic acid groups and hydroxyl groups; (c) at least 0.05 wt. % of a compatibilizing amount of a long chain organic acid having a carbon chain of about 10 to about 20 carbon atoms; and (d) at least about 50 wt. % water; and wherein the composition has a pH that is within about 2 pH units of the pK value of the cationic pharmaceutically active ingredient or within about 2 pH units of the pK value of the long chain organic acid.