Answer:
It could be cocaine, MDMA, amphetamine...
Step-by-step explanation:
Those are the drugs that can cause life threatening conditions, sometimes even death.
It mainly causes hyperthermia.
Some of the symptoms: very high temperature, which can damage brain pretty badly, other organs, too.
Other symptoms: muscle cramps, dizziness, headache, vomiting, feeling weak in general.
Heart rate is very high and redness of the skin might appear.