Ads
related to: h1 antihistamine drug list
Search results
Results From The WOW.Com Content Network
They are also structurally related to the tricyclic antidepressants (and tetracyclics), explaining the H 1-antihistaminergic adverse effects of those three drug classes and also the poor tolerability profile of tricyclic H 1-antihistamines. The second-generation H 1-antihistamine loratadine was derived from compounds in this group. Promethazine
H 1-receptor antagonists are competitive inhibitor of histamine receptor H 1 and are used to treat allergies. This group is often referred simply as antihistamines . Wikimedia Commons has media related to H1 receptor antagonists .
Clinically, H 1-antihistamines are used to treat allergic reactions and mast cell-related disorders. Sedation is a common side effect of H 1-antihistamines that readily cross the blood–brain barrier; some of these drugs, such as diphenhydramine and doxylamine, may therefore be used to treat insomnia.
Cetirizine acts as a highly selective antagonist of the histamine H 1 receptor. [3] The K i values for the H 1 receptor are approximately 6 nM for cetirizine, 3 nM for levocetirizine , and 100 nM for dextrocetirizine , indicating that the levorotatory enantiomer is the main active form. [ 3 ]
Another type of antihistamines known as H2-antihistamines are used to treat gastrointestinal conditions caused by excessive stomach acid. [8] Mechanism. H-1 antihistamines work by inhibiting histamine from binding to H-1 receptors. Histamine receptors expressed in smooth muscles, vascular endothelial cells, the heart, and the central nervous ...
H1 receptor antagonists (154 P) H2 receptor antagonists (20 P) H3 receptor antagonists (19 P) H4 receptor antagonists (3 P) Pages in category "Antihistamines"