The exposure-response relationship, often known as the dose-response relationship OR dose-effect curve, is a curve that shows how an organism's response changes depending on how much of a stimulus or stressor it is exposed to overtime. Dose-response curves are used to illustrate dose-effect relationships. For example, the dose-response relation varies from patient to patient because of differences in the numerous pharmacokinetic and pharmacodynamic determinants. Therefore, a prescriber cannot generate individual dose-response curves for each unique patient in clinical practice. There is also another type of curve called Parallel dose-response curves.