Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services immediately if the person:
And for anyone, someone who:
Contact a poison centre promptly whenever pokeweed may have been swallowed, even if there are no symptoms yet.
In the United States, Poison Control can be reached at 1-800-222-1222 .
Elsewhere, use your local poison information service.
Seek urgent same-day medical care for repeated vomiting, frequent diarrhea, worsening stomach pain, marked weakness, reduced urination, or difficulty keeping fluids down.
Children, older adults, and people with kidney or heart problems may become dehydrated more quickly.
The article also says
Have the following information ready if possible:
The person’s age and approximate weight
The plant part involved
Whether it was raw, cooked, dried, or made into a drink
The possible amount and time of exposure
Current symptoms
A photograph or description of the plant
Do not drive someone who is fainting, confused, having a seizure, or struggling to breathe.
Every sign above is quoted from the sofidex article on Pokeweed poisoning. If you are not sure, err upward — it is always reasonable to be checked.