<p>Imidazoline derivatives represented by general formula (I) or pharmacologically acceptable salts thereof, which exhibit high selectivity for a1L and are useful as drugs for the treatment of urinary incontinence. In general formula (I), either X or Y is hydrogen, and the other is NR1R2; R1 and R2 may be the same or different and are each hydrogen or methyl; and Z is chloro or methyl.</p>
