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 exposed person has:
Trouble breathing, noisy breathing, or blue or grey lips
Severe coughing or choking after swallowing varnish
Confusion, collapse, a seizure, or difficulty waking
Repeated vomiting with increasing sleepiness
Severe chest pain
Sudden loss of vision or severe eye pain
Call emergency services instead.
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
Contact a poison information service promptly after varnish is swallowed, even if the amount seems small and there are no symptoms.
Also seek advice after a substantial fume exposure, an uncertain exposure, or contact with an unfamiliar two-part product.
Elsewhere, use your local poison centre or urgent medical advice service.
3
Does any of this apply?
Book an appointment
For non-emergency follow-up, arrange medical care if cough, wheezing, fever, dizziness, eye irritation, or skin inflammation continues or returns after the initial exposure.
The article also says
In the United States, Poison Control can be reached at 1-800-222-1222 .
Do not enter an enclosed, fume-filled area to rescue someone unless you have appropriate training and equipment.
Every sign above is quoted from the sofidex article on Varnish poisoning. If you are not sure, err upward — it is always reasonable to be checked.