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Testicular torsion is a serious urologic emergency and one of the causes of infertility in males. Hence, prompt diagnosis and treatment are important to prevent testicular damages. It has been proved that dapsone (4, 40 diamino-diphenyl sulfone) has anti-oxidative and anti-inflammatory effects. Therefore, the aim of this study was to investigate the influence of dapsone on ischemia/reperfusion (I/R) injury in bilateral testes after unilateral testicular torsion/detorsion (T/D) in rats. In this experiment, eighteen male Wistar rats were allocated into three groups, including sham-operated, T/D + vehicle, and T/D + dapsone (12.5 mg/kg). Testicular torsion was induced for 1 h by rotating right (ipsilateral) testis 7200 in the clockwise direction. After 7 days of reperfusion, bilateral orchiectomy was conducted and evaluations of biochemical markers – tumor necrosis factor alpha (TNF-α) and superoxide dismutase (SOD) – and histological changes were performed. While induction of testicular T/D remarkably increased the level of TNF-α in the ipsilateral (torted) and contralateral (non-torted) testes, intraperitoneal (i.p) administration of dapsone (12.5 mg/kg) significantly lowered the TNF-α level (p