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
Collapses or cannot be awakened
Has a seizure
Develops blue, grey, or unusually pale lips or skin
Has severe confusion or sudden abnormal behaviour
And for anyone, someone who:
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 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
2
Is any of this happening?
Be seen today
Call a poison centre promptly after more than a small taste, if the amount is unknown, if the product has added medicated ingredients, or if you are unsure what to do.
This is also appropriate when mild nausea, vomiting, diarrhea, mouth irritation, or eye discomfort develops.
Seek urgent medical care for:
Repeated vomiting or inability to keep fluids down
Persistent coughing, wheezing, or chest discomfort
Ongoing eye pain or blurred vision after thorough rinsing
Increasing drowsiness, confusion, or poor coordination
Symptoms after deliberate swallowing or aerosol inhalation
The article also says
Do not give anything by mouth to someone who is unconscious, having a seizure, very drowsy, or unable to swallow safely.
Every sign above is quoted from the sofidex article on Shaving cream poisoning. If you are not sure, err upward — it is always reasonable to be checked.