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 your local emergency number immediately if pentazocine overdose is suspected, especially if the person:
Follow the product instructions and the emergency dispatcher’s guidance.
If the person is not breathing normally, begin CPR or rescue breathing if instructed or trained.
If they are breathing but unconscious, place them on their side when it is safe to do so.
Stay with them until help arrives.
If you are the person who may have taken too much and you are still awake, call emergency services or a poison centre and unlock the door for responders if you can do so safely.
Routine follow-up is appropriate after emergency treatment to review medicines, pain care, substance use, or mental health needs.
And for anyone, someone who:
New sleepiness, breathing difficulty, confusion, or fainting after discharge needs urgent reassessment.
And for anyone, someone who:
The article also says
Give naloxone if it is available.
Do not let someone “sleep it off.” Do not allow them to drive themselves to care.
Every sign above is quoted from the sofidex article on Pentazocine overdose. If you are not sure, err upward — it is always reasonable to be checked.