In this video, we can get the concept of concentration of drug affecting the response produced in the system, its clinical significance and its therapeutic index. TIMELINE: 0:04 Introduction 0:16 Log concentration-response curve 0:48 Reasons and analysis 1:13 Quantal dose-response curve 1:14 Graphical example 2:55 Therapeutic index 3:15 Clinical efficacy 3:50 Graphical explanation of the .efficacy 4:37 Conclusion / summarizing 4:52 End