The Monster energy drink corporation responded to a lawsuit brought on from parents of a teen who parents believed had suffered from a heart attack from drinking two 24 oz. monster energy drinks in one day. A 24 ounce can of Monster Energy contains 240 milligrams of caffeine from all sources. This is less than a 12 ounce cup of Starbucks brewed coffee, which contains about 260 milligrams of caffeine. A 16 ounce cup of Starbucks brewed coffee contains about 330 milligrams of caffeine.
