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 for:
Trouble breathing, noisy breathing, choking, or blue-grey lips
Swelling of the tongue, mouth, face, or neck
Collapse, fainting, severe confusion, or inability to wake
A seizure
Chest pain or a very fast, slow, or irregular heartbeat
Severe weakness, dark urine, or very little urine
Serious eye pain or sudden loss of vision
Routine follow-up is different from emergency care.
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 centre or urgent medical service immediately after any swallowed hair dye exposure.
Do this even when there are no symptoms.
Have the product label available if possible.
3
Does any of this apply?
Book an appointment
Arrange routine review after hospital treatment if advised, particularly to recheck kidney function, muscle injury, heart health, or healing chemical burns.
Ongoing itchy rashes after normal hair dye use can usually be assessed through routine primary care or dermatology unless breathing or facial swelling develops.
Every sign above is quoted from the sofidex article on Hair dye poisoning. If you are not sure, err upward — it is always reasonable to be checked.