192 Wistar male rats (180- 200 g) were used to evaluate the prophylactic effect of ozone combined with antibiotics in septic shock model. The proinflammatory cytokines (IL-1b, TNFa, IL-6 and IL-2) expression were also determinated in different haemathopoyetic organs. The animals were taken at random and divided into 16 groups, 12 animals each: Group A, positive control (sepsis without treatment); groups B and C treated with ozone (200 ug / 250 g b. w) and