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 now if someone has:
And for anyone, someone who:
Contact a poison centre or seek prompt medical advice after eating a green, sprouted, bitter, or damaged potato if vomiting, diarrhea, stomach pain, dizziness, weakness, or unusual drowsiness develops.
Prompt advice is also appropriate when a child has eaten sprouts, potato berries, or another part of the plant, even if the amount is uncertain.
Repeated vomiting, inability to keep fluids down, very little urine, blood in vomit or stool, or symptoms that continue or worsen should be assessed urgently.
Routine follow-up is usually unnecessary after mild symptoms have completely resolved.
Arrange follow-up if digestive symptoms persist, hydration remains difficult, or you do not return to your usual level of health.
The article also says
Do not give food, drink, or charcoal to someone who is unconscious, having a seizure, or unable to swallow normally.
Every sign above is quoted from the sofidex article on Potato plant poisoning - green tubers and sprouts. If you are not sure, err upward — it is always reasonable to be checked.