Abstract: The present invention is directed to an N-phenyl-N′-phenylpropylpiperazine derivative represented by formula (1): (wherein R1 represents a lower alkyl group; R2 represents a lower alkoxy group; and R3 represents a cyano group, a carboxyl group, or an indolecarbonyl group); a medicament; and to a process for producing the derivative. The compound of the present invention is endowed with potent &agr;1-adrenoceptor blocking activity, and thus is useful for the prevention or treatment of hypertension, congestive heart failure, myocardinal ischemia, arrhythmia, angina pectoris, and urinary obstruction and pollakiuria caused by benign prostatic hyperplasia.

Abstract: The present invention is directed to 3-benzoylindole derivatives represented by the following formula (I): (wherein R1 represents a lower alkyl group, n is an integer from 1 to 5; each of R2 and R3 represents a hydrogen atom, a lower alkyl group, or an optionally substituted phenyl group; and R4 represents a hydrogen atom, a lower alkyl group, or a benzyl group) and to a pharmaceutical containing the same. This compound is endowed with strong &agr;1-adrenergic receptor blocking action and strong testosterone 5&agr;-reductase inhibitory action, as well as high level of safety, and thus is useful as an excellent preventive or therapeutic drug for prostatic hypertrophy or accompanying urination disorder, alopecia, and acne.