H2 receptor antagonists overdose: when to get help
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 person:
Is difficult to wake, collapses, or has a seizure
Has trouble breathing or has blue or grey lips
Has severe confusion, agitation, or unusual behaviour
Has chest pain or a very fast, slow, or irregular heartbeat
Faints or cannot stand because of weakness
Took several substances or an unknown product
Keep the medicine package nearby for emergency staff.
Stay with the person if it is safe, remove access to more medicine, and contact emergency or crisis services.
Do not leave them alone to “sleep it off.”
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
Contact a poison centre promptly after any suspected overdose, even if there are no symptoms.
Early advice may prevent unnecessary treatment while identifying situations that need medical observation.
An intentional overdose needs urgent help even when the amount seems small.
3
Does any of this apply?
Book an appointment
Routine follow-up is appropriate after recovery if dosing mistakes are recurring, the medicine causes ongoing side effects, or there are questions about kidney function or medicine interactions.
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 drive someone who is very drowsy, confused, or medically unstable.
Every sign above is quoted from the sofidex article on H2 receptor antagonists overdose. If you are not sure, err upward — it is always reasonable to be checked.