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H 1 antagonists, also called H 1 blockers, are a class of medications that block the action of histamine at the H 1 receptor, helping to relieve allergic reactions.Agents where the main therapeutic effect is mediated by negative modulation of histamine receptors are termed antihistamines; other agents may have antihistaminergic action but are not true antihistamines.
Acrivastine is a medication used for the treatment of allergies and hay fever.It is a second-generation H1-receptor antagonist antihistamine (like its base molecule triprolidine) and works by blocking histamine H1 receptors.
Fexofenadine is used for relief from physical symptoms associated with seasonal allergic rhinitis and for treatment of hives, including chronic urticaria. [12] It does not cure, but rather prevents the aggravation of allergic rhinitis and chronic idiopathic urticaria, and reduces the severity of the symptoms associated with those conditions, providing relief from repeated sneezing, runny nose ...
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 ]
Chlorphenamine is the INN Tooltip International Nonproprietary Name while chlorpheniramine is the USAN Tooltip United States Adopted Name and former BAN Tooltip British Approved Name. Brand names include Chlor-Trimeton, Demazin, Allerest 12 Hour, Piriton, Chlorphen-12, Tylenol Cold/Allergy, and numerous others according to country.
Sominex is the trademarked name for several over the counter sleep aids.. Different formulations of Sominex are available, depending upon the market. Both the US and UK formulations contain a significant dose of a first generation antihistamine with hypnotic properties.