Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Immediate danger still requires emergency services.
Seek emergency care for fainting, severe breathing difficulty, chest discomfort, confusion, inability to wake, or a new suspected overdose.
And for anyone, someone who:
After discharge, contact the treating clinician promptly for new dizziness, unusual weakness, medication questions, or trouble following the recovery plan.
After an accidental overdose, follow-up may include reviewing all prescription and nonprescription medicines with a clinician or pharmacist.
Pill organizers, written medication schedules, pharmacy-prepared packaging, and reminders may help prevent repeat dosing errors.
Medicines should be stored in their original child-resistant containers, locked away from children and others who could be harmed.
If the overdose was intentional, follow-up should include a mental health assessment and a practical safety plan.
Family members or trusted supports may be asked to help secure medicines while the person recovers.
In the United States, someone experiencing suicidal thoughts can call or text 988 for the Suicide & Crisis Lifeline.
And for anyone, someone who:
The article also says
Before discharge, the care team will confirm that blood pressure, heart rhythm, alertness, breathing, and laboratory results are stable without intensive support.
The required observation period is individualized.
Do not restart, replace, or change a calcium-channel blocker unless the treating clinician or regular prescriber advises it.
The team may need to reconsider blood pressure or heart treatment after recovery.
Every sign above is quoted from the sofidex article on Calcium-channel blocker overdose. If you are not sure, err upward — it is always reasonable to be checked.