Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek emergency help again if unusual sleepiness, confusion, slow or difficult breathing, blue or gray coloring, fainting, or inability to wake returns.
Naloxone is not a replacement for emergency care.
And for anyone, someone who:
New severe abdominal pain, repeated vomiting, yellowing of the skin or eyes, or worsening confusion requires prompt medical assessment.
Arrange routine follow-up with the prescribing clinician to review why the overdose occurred and whether codeine remains appropriate.
A pharmacist can help identify duplicate ingredients and dangerous interactions.
These are not symptoms to wait for at a routine appointment.
If the event involved acetaminophen or another non-opioid ingredient, follow-up blood tests may be needed even if the person feels better.
A follow-up plan may include safe medication storage, disposing of unused opioids, and keeping naloxone available.
Household members can learn where naloxone is stored and how to use it.
And for anyone, someone who:
The article also says
After discharge, follow the care team’s instructions about medicines, laboratory tests, and activity.
If the overdose was related to nonmedical opioid use, cravings, or difficulty controlling use, compassionate treatment is available.
A clinician can discuss medications for opioid use disorder, counseling, and local support.
After a period without opioids, tolerance falls, so returning to a previous amount can be especially dangerous.
Every sign above is quoted from the sofidex article on Codeine overdose. If you are not sure, err upward — it is always reasonable to be checked.