This video describes the differences between efficacy and potency. In the video, we define the two terms and show you in a graphical format the ways in which the two terms differ. This video is specifically provided by EMTprep.com to assist students in preparing for the NREMT exam and related skills sheets and for no other purpose. NREMT study aids and resources provided by EMTprep are not intended to provide training for life-saving techniques, emergency response training, or any other type of medical training.