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 now if the person has trouble breathing, cannot be awakened normally, has a seizure, collapses, becomes severely confused, or has blue, grey, or unusually pale lips or skin.
Place an unconscious but breathing person on their side if it is safe to do so.
Do not put anything in their mouth.
Stay with the person if you can do so safely and contact emergency services or a crisis service.
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
Call a poison centre promptly if:
More than a small accidental sip was swallowed
The amount or product is unknown
A child swallowed mouthwash
The product was concentrated or contained a high alcohol level
Medicines, alcohol, or other substances were also taken
Nausea, vomiting, dizziness, confusion, or unusual sleepiness develops
Do not wait for symptoms after a large or deliberate ingestion.
Any suspected overdose taken for self-harm needs urgent help, even if there are no symptoms.
New cough, wheezing, chest pain, fever, or shortness of breath after vomiting needs prompt medical assessment because it may indicate aspiration.
3
Does any of this apply?
Book an appointment
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 Mouthwash overdose. If you are not sure, err upward — it is always reasonable to be checked.