Though the popularity of energy drinks is increasing day by day no considerable chemical studies on it has not yet been done in Bangladesh. This investigation was carried out to determine the pH, levels of caffeine and reducing sugar contents in five energy drinks available in local market in Rajshahi, Bangladesh. pH were measured by pH meter. Quantitative estimation of caffeine was performed by a simple and fast standard UV spectrophotometric method, using carbon tetrachloride as the extracting solvent. Reducing sugar content of the energy drink was also determined spectrophotometrically. Results showed that the pH of the beverages were perfectly acidic ranging from 2.85 to 3.11. The minimum caffeine level was observed in Brand-4 (40.34 mg/serving), while Brand-5 showed the highest caffeine content (244.57 mg/serving) showing a range from 40.34 to 244.57 mg/serving. The levels of caffeine in all energy drink samples are well below the maximum allowable limits set by the food regulatory bodies, except Brand-5. The reducing sugar content of the energy drinks ranged from 73.80 mg/serving to 136.08 mg/serving. Brand-1 has the lowest and Brand-4 has the highest reducing sugar providing an idea about the sugar contents of energy drinks. Further investigations are needed to determine the suitability of these energy drinks.