This video tells us about the anti-allergic drug histamine, its function and mode of action together with different types of effect it exerts on the body system. TIMELINE: 0:04 Introduction 0:48 Cellular responses of histamine 1:43 Histamine receptors in cellular tissue 2:22 Isolation of histamine 4:24 Histamine receptors ( H1,H2,H3,H4) 5:38 Histamine mechanism of action 5:49 H1 receptors 7:32 Cardiovascular and dermatological effects 9:09 Triple response 10:16 H2 receptors 11:26 Anaphylaxis 14:47 Conclusion