A 21-year-old medical student with a history of anxiety is brought to the Emergency Department by her parents after a possible propranolol overdose. The amount taken and time of ingestion are unclear. She appears mildly confused.
Her observations are:
Heart rate 80 beats/min
Blood pressure 110/70 mmHg
Respiratory rate 18 breaths/min
Oxygen saturation 100% on room air
Capillary blood glucose 5.1 mmol/L
Physical examination is otherwise unremarkable.
What is the most appropriate initial management step?
