What actions should you take if a casualty is not breathing?

The appropriate action to take if a casualty is not breathing is to begin CPR immediately. This is crucial because the absence of breathing indicates that the person is not getting oxygen, which is vital for survival. Quick intervention is essential; CPR helps maintain blood flow to vital organs and can prevent brain damage or death.

Starting CPR involves chest compressions and rescue breaths which work to circulate oxygenated blood throughout the body. Time is of the essence in these situations, and immediate action significantly increases the chances of survival until professional medical assistance can take over.

While ensuring the area is safe is important, it should not delay the lifesaving actions required when someone is not breathing. Administering medication is not appropriate in this emergency situation, as it does not address the immediate need for oxygenation through CPR. Waiting for medical professionals to arrive also does not address the immediate danger to the casualty's life posed by the lack of breathing. Therefore, beginning CPR is the best and most effective response.