الفهرس 
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Abstract
Energy drinks (EDs) are beverages which contain sugar, caffeine, taurine, herbs and vitamins. They have been increasingly consumed, particularly by teen agers and young adults, in the states, Europe and Aisa. Marketing of the beneficial effects of EDs magnifies their role in improving physical and mental status. Thesee beverages are thought to overcome sleepiness, maintain alertness, and increase physical and mental fitness. Recently, consumers use the stimulant
effect of EDs to counteract the sedative effect of alcohol. EDs are more used by male athletes
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practicing sports, by students during study and exams, and by young adults facing career interviews. Acontroversy has developed regarding the benefits and possible adverse effect of EDs. Most of the benefits of EDs are related to two constituents: caffeine and taurine. High caffeine level of EDS may result in caffeine intoxication in susceptible individuals. Caffeine intoxication may result in tachycardia, cardiac arrhythmias, vomiting, fits and death. Also, excessive consumption of EDs may be associated with poor mental health, metabolic and renal disorders, and obesity. Frequent ED consumers usually suffer from headache, anger, breathlessness, polyuria, and seizures. Dental enamel erosion could be produced by the acidity of these drinks.
The adverse effects of ED are poorly documented, although they have lately been assigned specific reporting codes so that their toxicity may be tracked. Since 2002, Germany has started keeping track of ED-related incidents, and a number of negative results have been documented. Considering that energy drinks have become a worldwide phenomenon, it is important to examine their short term and long term impacts on various body organs. In addition, the acute and chronic effects of extended use of these additives have not been adequately studied and documented.
So, the aim of this work was to investigate the effects of sub-chronic consumption of different doses of Power Horse energy drink on the liver and heart tissues of male experimental rats.
In this study four groups (6 animals /each) of rats are assigned and treated as following:
• group I (control) was orally administered water.
• group II was orally administered with a dose equal 0.4 mL/lOOg b.w/day (low dose).