Doxazosin, as mesilate (Alfadil XL) is contraindicated in patients with a known hypersensitivity to quinazolines, doxazosin, or any of the inert ingredients such as polyethylene oxide, hypromellose, ferric oxide, magnesium stearate, sodium chloride, cellulose acetate, polyethylene glycol, Opadry white, and Opacode Black Ink.