Disodium-4,4'-azo-bis-salicylate and pharmaceutical compositions containing the same

Methods and formulations for treating inflammatory bowel disease are disclosed. The methods and formulations include, but are not limited to, methods and formulations for delivering effective concentrations of 4-aminosalicylic acid and/or 5-aminosalicylic acid to affected areas of the intestine. The methods and formulations comprise modified-release elements, providing for drug delivery to the affected or desired area. Diseases and conditions treatable with the present invention include Crohn's disease and ulcerative colitis.