The active ingredient in DIPENTUM Capsules (olsalazine sodium) is a sodium salt of salicylate, disodium 3,3' -azobis (6-hydroxybenzoate) a compound that is effectively bioconverted to 5-aminosalicylic acid (5-ASA), which has anti-inflammatory activity in ulcerative colitis. Its empirical formula is C₁₄H₈N₂Na₂O₆ with a molecular weight of 346.21.

The structural formula is:

Olsalazine sodium is a yellow crystalline powder which melts with decomposition at 240°C. It is the sodium salt of a weak acid, soluble in water and DMSO, and practically insoluble in ethanol, chloroform and ether. Olsalazine sodium has acceptable stability under acidic or basic conditions.

DIPENTUM is supplied in hard gelatin capsules for oral administration. The inert ingredient in each 250 mg capsule of olsalazine sodium is magnesium stearate. The capsule shell has the following inactive ingredients: black iron oxide, caramel, gelatin, and titanium dioxide.

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