.png)
The case of longer lasting erections like priapism, which has come out with treatment of risperidone 2 mg/day in 12-year-old male patient with a diagnosis of dissociative disorder, is referred. The use of atypical antipsychotics in children and adolescents is becoming widespread in recent years. In our case, it is related to priapism dose and has emerged over time. In our case, prolonged erection like priapism has not come out with risperidone treatment 1mg/day whereas it has emerged with risperidone treatment 2mg/day. Additionally, the situation of priapism in children and adolescents is emphasized that constitute sexual problems in adulthood. Priapism-like situation are underdiagnosed drug side effects in children and adolescents. The affinities which antipsychotics react to alpha-1 adrenoceptor are different from each other. Risperidone has high affinity to alpha-1-receptor.