This video is a detailed description of the allergy agent histamine. Its mode of action, chemical mediators, signs and symptoms, and names of drugs in laymen terms. TIMELINE: 0:02 Introduction 0:18 Objectives 0:47 Chemical mediators 1:22 Histamine 1:55 Symptoms / allergy 2:44 Antihistamines 3:14 Prostaglandins 4:10 Aspirin and ibuprofen 5:00 Summary 5:32 Conclusion 5:49 End