Increased risk of high-grade prostate cancer; orthostatic hypotension; patients w/ excessive haemodynamic reaction on previous α
1-blocker treatment & receiving antihypertensives; CHD; intraoperative floppy iris syndrome; swallowing disorders eg, stenosing oesophageal changes or neurological disorders accompanied by impaired oesophageal motility. Breast cancer in men; changes in breast tissue eg, lumps or nipple discharge. Perform digital rectal exam & PSA level for prostate cancer detection. Monitor for acute or chronic urinary retention in patients w/ large residual urinary vol &/or severely impaired urine flow; recurrence of symptomatic BPH after discontinuation. Avoid contact w/ leaking cap. Not to be used in combination w/ other adrenergic α
1-blockers. Not to be co-administered w/ potent CYP3A4 inhibitors eg, ketoconazole, itraconazole, voriconazole, clarithromycin, indinavir, nelfinavir, ritonavir, saquinavir. Concomitant use w/ PDE5 inhibitors; moderate CYP3A4 inhibitors eg, erythromycin, fluconazole, verapamil, diltiazem. May affect ability to drive & use machines. Mild to moderate hepatic & severe renal impairment. Avoid use during pregnancy. Lactation. Not to be used in patients ≤21 yr.