This video tells us the types of receptors involved in the drug action in the process of pharmacodynamics, together with its functional classification, examples and chemical antagonism. They are the blocking agents of the drug type. TIMELINE: 0:04 Introduction 0:20 Allosteric antagonist (explanation) 1:13 Functional antagonism 1:41 Examples 1:44 Histamines 1:58 Epinephrine 2:22 Chemical antagonism 2:35 Examples of chemical antagonism 3:18 Summary 3:37 End