• Hypersensitivity to the active substance, other quinazolines (e. g. prazosin, terazosin), or to any of the excipients • Benign hyperplasia and concomitant congestion of the upper urinary tract, chronic urinary tract infections or bladder stones • Overflow bladder, anuria or progressive renal insufficiency • History of oesophageal or gastrointestinal obstruction or decreased lumen diameter of the gastrointestinal tract • Lactation.