Overview of Pharmacodynamics By Abimbola Farinde, PhD, PharmD, Columbia Southern University, Orange Beach, AL Reviewed / Revised Jun 2021 | Modified Sep 2022 View Patient Education Pharmacodynamics (sometimes described as what a drug does to the body) is the study of the biochemical, physiologic, and molecular effects of drugs on the body and involves receptor binding (including receptor sensitivity), postreceptor effects, and chemical interactions.