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
Contact your local poison centre or emergency medical service.
In the United States, Poison Control can be reached at 1-800-222-1222.
Call emergency services now if the person:
Is unconscious, difficult to wake, or severely confused
Has a seizure, collapses, or cannot stand safely
Has trouble breathing
Vomits blood or passes black, sticky stools
Has severe or worsening abdominal pain
Produces very little or no urine
Took diclofenac intentionally to cause harm
Do not delay emergency care while trying to collect this information.
And for anyone, someone who:
is unconscious, or cannot be woken
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 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
Get urgent poison advice immediately after any suspected diclofenac overdose.
Do not wait for symptoms.
3
Does any of this apply?
Book an appointment
And for anyone, someone who:
is having side effects from a medicine, or is struggling to take it as prescribed
The article also says
Do not leave an unconscious or severely drowsy person alone.
If they are breathing, place them on their side while waiting for help.
Do not give anything by mouth.
Take the medication packet or container to the hospital if it is safe to do so.
Note the likely time taken, the number of missing tablets, and any other substances involved.
Every sign above is quoted from the sofidex article on Diclofenac sodium overdose. If you are not sure, err upward — it is always reasonable to be checked.