Objective :To evaluate the efficacy and safety of Sertraline in the treatment of adolescents with internet addiction disorder .Methods :Using randomized ,double - blind controlled clinical trial included 64 adolescents with in‐ternet addiction ,according to the clinic or hospital order number .According to completely random method (applica‐tion of SPSS software random sampling group) ,all 64 patients received 8 weeks treatment with either Sertraline tab‐lets(Sertraline treatment group ,the dose of 50 to 100 mg /d ,n = 32)or placebo(placebo t...