Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Elsewhere, contact the local poison centre or emergency medical service.
Have the container, ingredient list, tablet strength, estimated amount, and time of exposure available.
Call emergency services now if the person has:
Do not give food, drink, charcoal, or another medicine unless a poison specialist or emergency professional advises it.
And for anyone, someone who:
Contact a poison centre promptly if someone may have taken more than the recommended amount.
This is especially important for a child, a pregnant person, an unknown amount, or a product containing iron.
Seek more urgent help if these symptoms become severe or are accompanied by confusion, fainting, or heart symptoms.
For gradual symptoms linked to long-term supplement use, arrange routine medical care.
Examples include ongoing thirst, frequent urination, constipation, headaches, skin changes, numbness, balance difficulty, or unexplained weakness.
And for anyone, someone who:
The article also says
In the United States, Poison Help is available at 1-800-222-1222 .
Every sign above is quoted from the sofidex article on Multiple vitamin overdose. If you are not sure, err upward — it is always reasonable to be checked.