The present invention relates to a controlled-release composition for producing a sustained-release preparation containing udenafil. More particularly, the present invention relates to a controlled-release composition for producing a sustained-release preparation containing udenafil, said composition comprising (A) udenafil and a pharmaceutically acceptable salt, (B) a solubility modulator, (C) an adsorbent, and (D) a hydrophilic polymer. The controlled-release composition for producing a sustained-release preparation containing udenafil according to the present invention releases drugs constantly regardless of the pH level in the gastrointestinal tract, and thus freely controls the drug release time within the range of 3 to 24 hours, and reduces the variability in the effect of drugs among individuals. In addition, the composition of the present invention can be produced into a sustained-release preparation which has an optimum condition for expressing the effect of drugs in the treatment of diseases such as pulmonary arterial hypertension, hepatic portal vein hypertension, benign prostatic hyperplasia, and the like, which can be treated by udenafil and which requires the administration of drugs over a long period of time. Further, the composition of the present invention can control the release of drugs in accordance with the time taken for the absorption thereof when said drugs are applied to a living body, and thus can be valuably used in preventing and treating erectile dysfunction.La présente invention concerne une composition à libération contrôlée pour produire une préparation à libération prolongée contenant de ludénafil. Plus particulièrement, la présente invention concerne une composition à libération contrôlée pour produire une préparation à libération prolongée contenant de ludénafil, ladite composition contenant (A) de ludénafil et un sel pharmaceutiquement acceptable, (B) un modulateur de solubilité, (C) un adsorbant, et (D) un polymère hydrophile. La
