Do not take Doxastad 4 mg prolonged release tablets and associated names • if you have ever suffered an allergic reaction (e. g. itching, reddening of the skin or difficulty breathing) to the active ingredient, doxazosin, or any of the other ingredients listed above • if you know that you are sensitive to quinazolines (e. g. prazosin, terazosin) which is the chemical family of medicines to which doxazosin belongs • if you have or have had any form of obstruction of the digestive tract • if you have benign prostatic hyperplasia and concomitant congestion of the upper urinary tract, chronic urinary infectiond or bladder stones • if you have overflow bladder, anuria or progressive renal insufficiency 21/ 24 Take special care with Doxastad 4 mg prolonged release tablets and associated names • if you suffer from liver disease • if you have suffered acute heart disease such as heart failure • if you are undergoing dialysis • if you are under 18 years of age