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 someone has:
Trouble breathing, severe wheezing, or blue or grey lips
Collapsed, stopped responding, or cannot be awakened normally
A seizure
Severe confusion, agitation, or weakness
Difficulty swallowing, heavy drooling, or swelling around the mouth
Severe eye pain, loss of vision, or a chemical burn
Swallowed a substance intentionally or as an act of self-harm
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 for any uncertain exposure, even if there are no symptoms.
This is especially important for children, unknown products, pesticides, rodenticides, nicotine, concentrated cleaners, or medicine sachets.
Have the packet or label available when possible.
New severe symptoms should be treated as urgent rather than waiting for a routine appointment.
3
Does any of this apply?
Book an appointment
Arrange medical review if mild symptoms do not settle, or if coughing, vomiting, eye discomfort, skin pain, unusual bruising, or marked tiredness develops after the exposure.
Routine follow-up is appropriate when a healthcare team has requested repeat blood tests, an eye check, breathing assessment, or review of a healing chemical burn.
The article also says
Move away from fumes if this can be done without entering a dangerous area.
Do not enter a contaminated space without appropriate protection.
Every sign above is quoted from the sofidex article on Sachet poisoning. If you are not sure, err upward — it is always reasonable to be checked.