The preferred medication during cardiopulmonary resuscitation is determined by the patient’s condition: if the patient’s cardiac monitoring and electrocardiogram suggest ventricular fibrillation, electrical defibrillation needs to be given promptly, and epinephrine needs to be given as an intravenous push. If blood pressure cannot be measured, continuous drip or pump dopamine therapy needs to be given. If cardiac monitoring shows cardiac arrest at that time, chest compressions and epinephrine infusion are continued. If the patient is not breathing on his own, respiratory stimulants such as niclosamide and lorcaserin should also be given as a continuous intravenous drip, as well as endotracheal intubation and ventilator-assisted respiratory therapy.