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 immediately for difficulty breathing, noisy breathing, blue or grey lips, collapse, severe drowsiness, or rapidly increasing tongue or throat swelling.
Do not give food or drink to someone who cannot swallow safely.
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
Call a poison centre promptly after someone chews or swallows an elephant ear plant, especially if it is not confidently identified.
A specialist can advise whether home observation or in-person assessment is appropriate.
Seek urgent medical care for:
Persistent or increasing swelling of the lips, tongue, mouth, or throat
Ongoing vomiting or inability to keep fluids down
Severe pain or difficulty swallowing
Drooling that does not settle
A hoarse or changed voice
Eye pain, blurred vision, light sensitivity, or redness after thorough rinsing
Symptoms that are worsening rather than improving
Breathing difficulty or rapid swelling should not wait for a routine appointment.
The article also says
Mild lingering mouth soreness without breathing or swallowing problems can usually be discussed with a primary care professional or poison centre.
Every sign above is quoted from the sofidex article on Elephant ear poisoning. If you are not sure, err upward — it is always reasonable to be checked.