Polidocanol is used for the treatment of uncomplicated spider veins (varicose veins ≤1 mm in diameter) and uncomplicated reticular veins (varicose veins 1 to 3 mm in diameter) in the legs, a condition where the veins become large, twisted and swollen when the vein valves do not work properly. This medicine is not recommended for use in patients less than 18 years of age.