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Doxylamine and other first-generation antihistamines are the most widely used sleep medications in the world. [6] Typical side effects of doxylamine (at recommended doses) include dizziness, drowsiness, grogginess, and dry mouth, among others. [7] [4] As an antihistamine, doxylamine is an inverse agonist of the histamine H 1 receptor.
Loratadine is a tricyclic antihistamine, which acts as a selective inverse agonist of peripheral histamine H 1 receptors. [22] [26] The potency of second generation histamine antagonists is (from strongest to weakest) desloratadine (K i 0.4 nM) > levocetirizine (K i 3 nM) > cetirizine (K i 6 nM) > fexofenadine (K i 10 nM
Diphenhydramine, sold under the brand name Benadryl among others, is an antihistamine and sedative. It is a first-generation H 1-antihistamine and it works by blocking certain effects of histamine, which produces its antihistamine and sedative effects. [11] [2] Diphenhydramine is also a potent anticholinergic. [12]
Doxepin is a prescription tricyclic antidepressant used to treat various conditions ranging from major depressive disorder (MDD) to insomnia. ... Since it has strong antihistamine properties ...
H 1-antihistamines can be administered topically (through the skin, nose, or eyes) or systemically, based on the nature of the allergic condition. The authors of the American College of Chest Physicians Updates on Cough Guidelines (2006) recommend that, for cough associated with the common cold, first-generation antihistamine-decongestants are ...
Doxepin is a highly potent antihistamine, with this being its strongest activity. [ 49 ] [ 53 ] [ 57 ] [ 8 ] In fact, doxepin has been said to be the most or one of the most potent H 1 receptor antagonists available, with one study finding an in vitro K i of 0.17 nM. [ 37 ]