Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
The poison service can help determine whether home observation, an urgent clinic visit, or emergency department care is appropriate.
Call emergency services immediately if the person:
While waiting for emergency help, do not give food or drink to someone who is drowsy, confused, seizing, or unable to swallow safely.
If the person is unconscious but breathing, place them on their side if you can do so safely.
And for anyone, someone who:
Contact a poison information service promptly whenever Jerusalem cherry may have been swallowed.
This is appropriate even when the person feels well because symptoms can be delayed and the amount of toxin is difficult to estimate.
Seek urgent medical assessment if the person develops repeated vomiting, significant abdominal pain, increasing drowsiness, confusion, unusual behaviour, weakness, or trouble walking.
Every sign above is quoted from the sofidex article on Jerusalem cherry poisoning. If you are not sure, err upward — it is always reasonable to be checked.