PROBLEM TO BE SOLVED: To provide medicament for treating and/or improving symptoms accompanied by interstitial cystitis, and/or having effectiveness for inhibiting their deterioration.SOLUTION: To provide medicament comprising naftopidil for treating and/or improving and/or inhibiting deterioration of symptoms accompanied by interstitial cystitis.COPYRIGHT: (C)2014,JPO&INPIT【課題】 間質性膀胱炎に伴う症状を治療及び/又は改善及び/又は悪化抑制に有効性を有する医薬を提供する。【解決手段】 間質性膀胱炎に伴う症状を治療及び/又は改善及び/又は悪化抑制するためのナフトピジルを含有する医薬。【選択図】なし