The Food and Drug Administration is investigating five deaths and one non-fatal heart attack that may have been caused by Monster Energy Drink, a highly caffeinated beverage.

According to the reports being analyzed, people have had adverse reactions after consuming the popular drink, which contains 240 milligrams of caffeine – seven times the amount of caffeine found in a 12-ounce cola. The drink is packaged in a 24-ounce can.

Further: Are Energy Drinks Dangerous for Kids?