What to do if you think someone is overdosing on a substance like fentanyl or heroin?
It may be hard to tell whether a person is high or experiencing an overdose. If you aren’t sure, treat it like an overdose—you could save a life.
•Call 911 Immediately!
•Administer naloxone, if available.
•Try to keep the person awake and breathing.
•Lay the person on their side to prevent choking.
•Stay with the person until emergency assistance arrives.
Original source can be found here.