Can't speak for parent specifically, but high doses of caffeine can cause: - Cardiovascular events - Seizures - Panic attacks - Psychotic episodes These ar

Can't speak for parent specifically, but high doses of caffeine can cause: - Cardiovascular events - Seizures - Panic attacks - Psychotic episodes These are all exceptional, but it's not that difficult to get to the associated dose range, particularly if you have some preexisting vulnerability that lowers the threshold for one or more of them. Since sensitivities vary in general it's hard to nail down any specific number, but the order of magnitude is around a pot of coffee or a six-pack of one of the more potent energy drinks.