In this video, we can appreciate the uses of antiallergic drug - Antihistamine. Types of it and its usage based on doses and types of allergies in the body. TIMELINE: 0:09 Introduction 0:47 Antihistamines (1st generation) 1:00 Diphenhydramine 1:04 Chlorphenamine 1:07 Cyclizine 1:11 Antihistamines (2nd generation) 1:22 Cetirizine 1:24 Fexofenadine 1:30 Conclusion