The Truth About Energy Drinks 3 Dangers Of Consuming Red Bull Energy Drinks There are three reasons why you should not drink Red Bull energy drinks: -First, drinking one 12 ounce can of Red Bull can significantly increase heart rate and blood pressure within 90 minutes of having the drink for up to 24 hours. The increase in heart rate and blood pressure is largely due to the caffeine content in Red Bull as each can contains 108 mg of caffeine. Although occasional consumption of Red Bull in healt