I haven't had to experience this situation, but a story made me wonder what I should do in the event that someone swallows a lot of chemicals- enough to potentially be lethal, maybe.

A specific example: Someone swallows several bottles of pills. I find them and they tell me what they did, or their actions are readily apparent- somehow I know what they've done. Should I call poison control first or 911? Should I just try to get to the ER with them as fast as possible?