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 emergency services if you or someone with you has:
Severe difficulty breathing, gasping, or very shallow breathing
Blue or grey lips, tongue, or skin
New confusion, collapse, or difficulty waking
A seizure
Suspected opioid, sedative, or other drug overdose
Breathing that becomes slow or irregular after taking a sedating substance
If naloxone is available for a possible opioid overdose, use it as instructed and still call emergency services.
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 unconscious, or cannot be woken
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
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
Seek prompt medical advice if you develop worsening morning headaches, increasing daytime sleepiness, new breathlessness, or repeated low oxygen readings.
These symptoms are more urgent if you already have lung disease, muscle weakness, a chest wall condition, or use medicines that can suppress breathing.
3
Does any of this apply?
Book an appointment
Routine follow-up is appropriate for equipment discomfort, mild mask leaks, stable symptoms, or questions about monitoring.
Arrange an earlier review if prescribed breathing support is no longer tolerable or does not seem to control your symptoms.
The article also says
Do not let a very drowsy person “sleep it off” after a suspected overdose.
Every sign above is quoted from the sofidex article on Hypoventilation. If you are not sure, err upward — it is always reasonable to be checked.