Doxazosin mesylate is a quinazoline compound that is a selective inhibitor of the alpha₁ subtype of alpha adrenergic receptors. The chemical name of doxazosin mesylate is 1-(4-amino-6,7-dimethoxy-2-quinazolinyl)-4-(1,4-benzodioxan-2-ylcarbonyl) piperazine methanesulfonate. The empirical formula for doxazosin mesylate is C₂₃H₂₅N₅O₅•CH₄O₃S and the molecular weight is 547.6. It has the following structure:

Cardura is freely soluble in dimethylsulfoxide, soluble in dimethylformamide, slightly soluble in methanol, ethanol, and water (0.8% at 25°C), and very slightly soluble in acetone and methylene chloride. Doxazosin mesylate is available as colored tablets for oral use and contains 1 mg (white), 2 mg (yellow), 4 mg (orange) and 8 mg (green) of doxazosin as the free base.

The inactive ingredients for all tablets are: microcrystalline cellulose, lactose, sodium starch glycolate, magnesium stearate and sodium lauryl sulfate. The 2 mg tablet contains FD&C yellow 10 and FD&C yellow 6; the 4 mg tablet contains FD&C yellow 6; the 8 mg tablet contains FD&C blue 10 and FD&C yellow 10

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