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 for a seizure, collapse, severe breathing difficulty, or inability to wake the person.
An intentional poisoning is a medical emergency, not a personal failure.
And for anyone, someone who:
Seek prompt medical advice after discharge for decreasing urination, worsening swelling, repeated vomiting, new weakness, increasing confusion, or a return of breathing problems.
After hospital treatment, follow-up usually focuses on kidney recovery and any remaining symptoms.
The care team may repeat blood tests to check kidney function, electrolytes, and the body's acid balance.
People who required dialysis may need continued assessment by a kidney specialist until kidney function is stable.
Routine follow-up may include reviewing medicines, hydration instructions, activity limits, and the timing of laboratory testing.
Follow the discharge plan rather than using supplements or changing fluid intake without medical guidance, especially if kidney function has been affected.
If the exposure was intentional, compassionate mental health care is an important part of follow-up.
This may include a safety plan, crisis support, counseling, or treatment for depression, substance use, or another contributing condition.
The article also says
Families can also reduce future risk by checking how automotive chemicals are stored, keeping them in original containers, securing caps, and disposing of unwanted products through an appropriate hazardous-waste program.
Every sign above is quoted from the sofidex article on Antifreeze poisoning. If you are not sure, err upward — it is always reasonable to be checked.