Avoid concomitant use w/ other α-blockers or strong P-gp inhibitors. Intraoperative floppy iris syndrome during cataract surgery, postural hypotension during initial therapy & syncope may occur. Orthostatic hypotension. Fluctuation in BP. Abnormal ejaculation. Concomitant use w/ other hypotensive agents. Discontinue or reduce dose if a decrease in BP occurs in concomitant use w/ hypotensive drugs. Dizziness may occur & may impair ability to drive & operate machine.