Final answer:
Amiodarone or lidocaine, along with epinephrine, are used in the management of pulseless Vfib/Vtach; atropine is not indicated for these conditions.
Step-by-step explanation:
In the management of pulseless ventricular fibrillation (Vfib) or ventricular tachycardia (Vtach), the drugs that should be used include amiodarone or lidocaine as antiarrhythmic agents, and epinephrine as a vasopressor. Amiodarone and lidocaine are potassium channel blockers that affect the repolarization phase of the cardiac action potential. Atropine is not used in the management of pulseless Vfib/Vtach because it is generally reserved for bradyarrhythmias, where a higher heart rate is desired.