An agent for the prevention and/or treatment of urine collection disorders associated with lower urinary tract obstructive disease, characterized by containing an indoline derivative represented by the following general formula (I): wherein R; R1; and R2 are defined in the specification. The derivative and salt are usable as an agent for the prevention and/or treatment of urine collection disorders associated with lower urinary tract obstructive disease. Silodosin is the preferred indoline derivative.
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