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, blue or grey lips, or severe wheezing
Collapses, has a seizure, cannot be awakened, or is very confused
Has severe chest or abdominal pain
Vomits blood or has signs of a major chemical burn
Cannot swallow, is drooling heavily, or has rapidly increasing throat swelling
Elsewhere, contact the local poison information service or emergency medical service.
Follow the discharge plan provided after emergency treatment.
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 ink remover has been swallowed, even if there are no symptoms.
Also seek prompt advice for an unknown product, a large or concentrated exposure, persistent coughing, significant skin burns, or any eye exposure that remains painful after rinsing.
3
Does any of this apply?
Book an appointment
Routine follow-up is appropriate after the immediate danger has passed if there is a continuing cough, painful swallowing, reduced appetite, skin damage, or a change in vision.
The article also says
Do not enter an area with strong fumes unless trained and properly protected.
In the United States, Poison Control can be reached at 1-800-222-1222.
Every sign above is quoted from the sofidex article on Ink remover poisoning. If you are not sure, err upward — it is always reasonable to be checked.