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 the exposed person has trouble breathing, collapses, cannot be awakened normally, has a seizure, becomes severely confused, or develops blue or grey lips or skin.
Move away from fumes only if it is safe to do so.
And for anyone, someone who:
Do not wait for symptoms after a known or suspected swallowing.
Contact a poison centre promptly for advice based on the exact product.
In the United States, Poison Help is available at 1-800-222-1222.
Elsewhere, use your national or regional poison information service.
Get urgent medical assessment for repeated coughing or choking after swallowing, persistent vomiting, chest pain, wheezing, increasing drowsiness, fainting, or an irregular heartbeat.
Eye pain or blurred vision that continues after rinsing also needs prompt assessment.
After initial treatment, seek urgent reassessment if breathing becomes harder, cough worsens, fever develops with respiratory symptoms, alertness changes, or symptoms return.
Routine follow-up is appropriate for stable, gradually improving symptoms when this was recommended at discharge.
Every sign above is quoted from the sofidex article on Tar remover poisoning. If you are not sure, err upward — it is always reasonable to be checked.