Dose-response curves and therapeutic index

In this talk, the focus is dose response curves and therapeutic index, highlighting how a drug's effects change with varying doses and how these curves inform us about potency, efficacy and safety. We will discuss key metrics such as EC 50 and LD 50, and how therapeutic index is used to assess a drugs safety margin. The lecture will also address how individual patient factors, including genetics and age, influence drug responses and underscore the importance of personalized dosing. Understanding the relationship between a drug's dose and its effect is fundamental in both drug development and clinical practice. When a medication is given, its effect varies according to the dose. This relationship is depicted using a dose response curve with dose on the horizontal axis and effect on the vertical axis. Dose response curves reveal key details such as the threshold dose range of increasing effect, and when higher doses increase risk. The shape of dose response curves varies with the drug and its mechanism of action. Many drugs show a sigmoidal or S shaped dose response curve with a steep middle range between lower and upper plateaus. Low doses produce little effect at first. Then effects rise rapidly before plateauing, where higher doses add minimal benefit. In some cases, such as with certain toxins or weak agonists, the relationship may be more linear. Dose response curves allow for