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 for any suspected methamphetamine overdose, especially if there is:
Tell emergency responders what may have been taken and when, if known.
This information is used to guide care, not to judge the person.
If they are not breathing normally, begin CPR if you know how and follow the emergency dispatcher’s instructions.
Give naloxone if an opioid like oxycodone or morphine may be involved and it is available.
An unconscious person, breathing problem, seizure, stroke symptom, chest pain, or severe overheating requires emergency services rather than routine Poison Control follow-up.
And for anyone, someone who:
Do not wait for every symptom to appear.
Arrange non-emergency follow-up for continuing anxiety, low mood, sleep problems, hallucinations, chest discomfort, or reduced urination after discharge.
Support for methamphetamine use can also be sought without waiting for another crisis.
And for anyone, someone who:
The article also says
While waiting, move nearby hazards away and keep the area as calm and cool as possible.
Do not try to hold down someone who is severely agitated unless needed to prevent immediate injury.
Do not give food, drinks, or additional drugs, and do not make the person vomit.
If the person is unconscious but breathing, place them on their side if you can do so safely.
In the United States, Poison Control can be reached at 1-800-222-1222 for immediate advice.
Every sign above is quoted from the sofidex article on Methamphetamine overdose. If you are not sure, err upward — it is always reasonable to be checked.