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 thioridazine overdose is known or suspected.
Emergency warning signs include:
If they are not breathing normally, begin CPR if you know how and follow the emergency dispatcher's instructions.
Call emergency services instead if symptoms are present or the exposure was intentional.
Routine follow-up is appropriate after emergency care if the person remains stable but needs medication review, repeat heart testing, or mental health support.
New fainting, palpitations, seizures, severe drowsiness, or breathing trouble remains an emergency.
And for anyone, someone who:
Do not wait for symptoms, and do not drive an unwell person to hospital yourself.
For a possible extra dose without symptoms, contact a poison centre immediately for case-specific advice.
In the United States, Poison Control is available at 1-800-222-1222 .
Elsewhere, use your local poison information service.
And for anyone, someone who:
The article also says
If the person is unconscious but breathing, place them on their side if you can do so safely.
Do not make the person vomit.
Do not give food, drink, or home remedies unless a poison specialist tells you to.
Bring the medicine container and information about any other substances to the hospital.
Every sign above is quoted from the sofidex article on Thioridazine overdose. If you are not sure, err upward — it is always reasonable to be checked.