Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
After emergency treatment, follow the discharge instructions about activity, hydration, medicines, and returning to work, school, or driving.
Do not restart brompheniramine or another sedating antihistamine until the treating clinician says it is appropriate.
Call emergency services for a seizure, fainting, severe breathing difficulty, inability to awaken, or sudden severe agitation.
If there is an immediate risk of further self-harm, contact emergency services or a local crisis service rather than waiting for a routine appointment.
And for anyone, someone who:
Seek urgent reassessment for worsening confusion, repeated vomiting, inability to urinate, persistent rapid heartbeat, increasing weakness, or a fever with hot, dry skin.
Follow-up depends on the severity and cause of the exposure.
Arrange routine follow-up if symptoms such as mild tiredness, dry mouth, or concentration problems persist after discharge.
A clinician or pharmacist can also review the person's medication list and help identify products with overlapping ingredients.
If the exposure was intentional, follow-up should include mental health care and a practical safety plan.
And for anyone, someone who:
The article also says
After an accidental exposure, prevention may include storing medicines in locked or elevated locations, keeping them in their original containers, and using the supplied measuring device for liquids.
Check the “active ingredients” panel before combining cold, allergy, or sleep products.
Every sign above is quoted from the sofidex article on Brompheniramine overdose. If you are not sure, err upward — it is always reasonable to be checked.