If you suspect that someone around you has taken amphetamines in larger quantities, call the local emergency medical services right away. As you wait for help to arise, stay calm and keep reassuring the person that you are with them and that help is on the way. Meanwhile, try to find out as much as possible about the exact type of amphetamine they have taken and in what quantities. Also, enquire about any other drugs that they might be using or any diagnosed medical illnesses that they might have. Once the help arrives, provide as much information as possible to the medical personnel to make the treatment process more straightforward.