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Loratadine, sold under the brand name Claritin among others, is a medication used to treat allergies. [5] This includes allergic rhinitis (hay fever) and hives . [ 5 ] It is also available in drug combinations such as loratadine/pseudoephedrine , in which it is combined with pseudoephedrine , a nasal decongestant . [ 5 ]
[medical citation needed] Loratadine is a long-acting antihistamine (H 1 histamine antagonist) that is less sedating than older substances of its type. [ medical citation needed ] In 2022, it was the 289th most commonly prescribed medication in the United States, with more than 500,000 prescriptions.
An H 3-antihistamine is a classification of drugs used to inhibit the action of histamine at the H 3 receptor. H 3 receptors are primarily found in the brain and are inhibitory autoreceptors located on histaminergic nerve terminals, which modulate the release of histamine .
These agents also commonly have action at α-adrenergic receptors and/or 5-HT receptors. This lack of receptor selectivity is the basis of the poor tolerability profile of some of these agents, especially when compared with the second-generation H 1-antihistamines. Patient response and occurrence of adverse drug reactions vary greatly between ...
Desloratadine sold under the brand name Clarinex among others, is a tricyclic H 1 inverse agonist that is used to treat allergies.It is an active metabolite of loratadine. [6]It was patented in 1984 and came into medical use in 2001. [7]
Among second-generation antihistamines, cetirizine is more likely than fexofenadine and loratadine to cause drowsiness. [7] Use in pregnancy appears safe, but use during breastfeeding is not recommended. [8] The medication works by blocking histamine H 1 receptors, mostly outside the brain. [6] Cetirizine can be used for paediatric patients.