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 needed for difficulty breathing, a seizure, collapse, severe confusion, bluish or gray skin, inability to awaken, or suspected methanol exposure.
Do not let a severely drowsy person “sleep it off” without professional advice.
After emergency treatment, routine follow-up may be recommended if there were abnormal blood tests, persistent stomach symptoms, eye irritation, or complications involving the lungs or nervous system.
Immediate help is appropriate if there are continuing thoughts of self-harm or concern about another ingestion.
And for anyone, someone who:
Seek prompt medical advice if vomiting continues, alertness changes, balance worsens, or new symptoms develop.
Attend any planned laboratory or clinical checks even if the person feels better.
If the ingestion was intentional or connected to alcohol use, follow-up should include compassionate mental health or substance-use care.
The article also says
After home observation, follow the poison center's instructions about how long to watch for symptoms.
Families can reduce future risk by keeping aftershave and other alcohol-containing products locked away in their original containers.
Child-resistant caps lower risk but are not fully childproof.
Every sign above is quoted from the sofidex article on Aftershave poisoning. If you are not sure, err upward — it is always reasonable to be checked.