What Kind Of Poisoning Occurred After Taking E Marked Pills?

a 19 year old male goes out with his friends on saturday night.they purchased few pills from a guy standing at the street corner.at 4 am,he is brought to hospital emergency comatosed.his friend told doctor that he took 3 pills with an "e" mark on them.what kind of poisoning occured?name 3 clinical features of this poisoning?name the worst prognostic indicator?how will you treat dehydration?