Abstract: Background: Red bull (RB) energy drinks became popular especially among young adults believing that they improve the level of performance and giving them more energy. Objectives: One of most susceptible organs to the toxicity of red bull is the liver. Therefore, the goal of our study was to assess the effects of RB ingestion on the livers of adult male albino rats as well as the consequences of its withdrawal. Materials and Methods: Thirty six adult male albino rats were divided into 3 groups; control group, Red bull given group (received red bull in a dose 1.5 ml/100g b.wt daily orally for 4 weeks) and withdrawal group (received red bull as in Red bull group and left for 4 weeks without treatment). Specimens of the liver were taken from all groups and processed for the light, electron microscopic and immunohistochemical study. Morphometric measurements and statistical analysis were done. Results: Red bull given group displayed a significantly higher serum level of liver enzymes in comparison to the control group. Loss of the typical liver architecture was noticed through histopathological analysis in the same group; most hepatocytes were degenerated with pyknotic nuclei and cytoplasmic vacuolations. Lipid droplets infiltration was noticed between hepatocytes. Leucocytic infiltration surrounding central vein and vessels of portal area with eosinophilic exudate within and between portal area vessels were seen. The immunohistochemical results demonstrated a significant increase in alpha smooth muscle actin (α-SMA). The ultrastructural assessment confirmed these changes. However, cessation of RB intake showed improvement in the liver histopathological and biochemical changes depicted previously.