In the present work we investigated the effects of Crotalus durissus terrificus venom (CdtV) on the pulmonary mechanic events [static and dynamic elastance, resistive (ΔP1) and viscoelastic pressures (ΔP2)] and histology after intramuscular injection of saline solution (control) or venom (0.6μg/g). The static and dynamic elastance values were increased significantly after 3h of venom inoculation, but were reduced at control values in the other periods studied. The ΔP1 values that correspond to the resistive properties of lung tissue presented a significant increase after 6h of CdtV injection, reducing to basal levels 12h after the venom injection. In ΔP2 analysis, correspondent to viscoelastic components, an increase occurred 12h after the venom injection, returning to control values at 24h. CdtV also caused an increase of leukocytes recruitment (3–24h) to the airways wall as well as to the lung parenchyma. In conclusion, C. durissus terrificus rattlesnake venom leads to lung injury which is reverted, after 24h of inoculation.