H1 antihistamines: classification, action, uses, side effects
H1 antihistamines compete with histamine to block its effects at H1 receptors, such as cetirizine, promethazine, pheniramine, azelastine etc. They have antiallergic actions while have poor antipruritic, antiemetic and antitussive actions. According to recent research, the H1 receptor has some constitutive activity, and H1 antihistaminics also possesses inverse agonistic action. H1 ANTIHISTAMINES CLASSIFICATION 1st generation […]
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