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