Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Call your local emergency number now if someone:
Cannot be woken or is only briefly responsive
Is breathing slowly, irregularly, or not at all
Makes choking, gurgling, or unusual snoring sounds
Has blue, gray, or very pale lips, gums, or skin
Collapses after taking heroin or an unknown drug
Improves with naloxone, because breathing can slow again
Give naloxone if available and follow emergency-dispatch instructions for rescue breathing or CPR.
Stay until help arrives.
Calling for help is appropriate even when you are unsure whether opioids were involved.
And for anyone, someone who:
is unconscious, or cannot be woken
you believe has taken an overdose or swallowed something poisonous
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
2
Is any of this happening?
Be seen today
Seek prompt medical advice after discharge for worsening cough, fever, chest pain, shortness of breath, severe muscle pain, dark urine, confusion, weakness, or new problems with memory or movement.
3
Does any of this apply?
Book an appointment
Arrange routine follow-up after any non-fatal overdose, even if you feel well.
Follow-up can address lung or injury symptoms, replace naloxone, test for infections when relevant, and connect you with opioid use disorder treatment.
And for anyone, someone who:
is having side effects from a medicine, or is struggling to take it as prescribed
Every sign above is quoted from the sofidex article on Heroin overdose. If you are not sure, err upward — it is always reasonable to be checked.