Answer:
Ensure there is a heartbeat.
Step-by-step explanation:
19 year old female is unresponsive after taking a whole bottle of her sleeping medicine about 4 hours ago. You should ensure there is a heartbeat. This is because, a heartbeat means the person is still alive and are still able retreive medical attention. However, you should always call the police, asking for an ambulance, even if you think you have everything under control.