Increased blood pressure
Taking energy drinks can elevate systolic blood pressure [2] within a short time after drinking. If you are trying to control your blood pressure in a healthy way, then you should avoid adding energy drinks to your diet.
Increase blood glucose
This can cause diabetes [3]. Taking energy drinks may cause your blood sugars to elevate. You must be cautious of this effect, especially if you have diabetes.
May negatively affect dental health
You might have to visit your dentist to monitor this effect. Since energy drinks are mostly produced with sugar and the pH values are beneath the critical value (5.5) associated with dental erosion, drinking them can have negative effects on your dental health. Specifically, you become more susceptible to dental erosion [4] and cavity risk.