Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Emergency care is appropriate for breathing difficulty, collapse, seizure, inability to awaken, severe confusion, or chest pain.
And for anyone, someone who:
Urgent reassessment is needed if symptoms return after seeming to improve, the person cannot maintain hydration, or signs of dehydration develop.
Routine follow-up is reasonable if digestive symptoms continue beyond the expected laxative effect, constipation keeps returning, or the overdose happened because the label was confusing.
A clinician or pharmacist can review all medicines and suggest ways to avoid repeated dosing errors.
And for anyone, someone who:
The article also says
Follow the monitoring plan given by Poison Control or the treating healthcare professional.
Watch for worsening diarrhea, repeated vomiting, increasing abdominal pain, dizziness when standing, unusual sleepiness, or reduced urination.
After symptoms settle, regular meals and fluids can usually be resumed as tolerated.
Do not restart castor oil or another laxative until a healthcare professional or pharmacist confirms that it is appropriate.
Ongoing constipation may need a safer long-term plan based on its cause.
Store castor oil in its original child-resistant container, separate from foods and household chemicals.
Use the measuring device provided with the product rather than an ordinary kitchen spoon.
Every sign above is quoted from the sofidex article on Castor oil overdose. If you are not sure, err upward — it is always reasonable to be checked.