possible to overdose two deaths have been officially reported risk of overdose not to exceed 500mg a day official DSM-5 Criteria Source caffeine Overdose two deaths have been officially reported common side effects of too much caffeine increased health scrutiny common side effects of too much caffeine caffeine Overdose caffeine intoxication two deaths have been officially reported two deaths have been officially reported Symptoms Src caffeine Overdose Caffeine Overdose Symptoms: Signs, Cases and Prevention overdose on coffee Excessive caffeine not to exceed 500mg a day caffeine rush caffeine Overdose caffeine Overdose