[Object]The present invention is intended to provide a urethral stricture treatment agent and a urethral stricture treatment method capable of avoiding restenosis by a less invasive transurethral endoscopic procedure in urethral stricture treatment.[Solution]A urethral stricture treatment agent including at least a hydrogel-forming polymer, and having a storage elastic modulus of 50 Pa or less at 10°C and a storage elastic modulus of 100 Pa or more at 37°C.A urethral stricture treatment method at least including injecting the urethral stricture treatment agent cooled to 10°C or lower into an inner surface of urethra which has been incised with a transurethral endoscopic procedure, and holding the urethral stricture treatment agent in the inner surface of urethra at a temperature not lower than a room temperature.[Selected Drawing]None
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