Desloratadine

Desloratadine is a long-acting second-generation H1 antihistamine used to relieve allergic rhinitis and chronic idiopathic urticaria symptoms, with limited penetration into the brain.

Histamine H1 receptor: A G-protein-coupled receptor through which histamine produces effects including itching, sneezing, and increased vascular permeability. Desloratadine blocks this receptor to reduce allergy symptoms.
Second-generation antihistamine: An H1-receptor-blocking medicine designed to cause less central nervous system sedation than first-generation antihistamines. Desloratadine belongs to this class of allergy medicines.
Diphenhydramine: A first-generation H1 antihistamine that commonly causes drowsiness and has anticholinergic effects. Its stronger central effects illustrate the sedation difference sought with desloratadine.
Schering-Plough: A pharmaceutical company that developed and marketed loratadine and desloratadine. The company developed desloratadine as a medicine derived from loratadine.
Inverse agonist: A ligand that reduces a receptor’s constitutive activity by favoring its inactive state. Desloratadine’s H1-receptor action is commonly described as inverse agonism.
Antihistamine: A medicine that blocks or reduces the effects of histamine at one or more receptor types. Desloratadine is an H1-selective member of this broad medicine class.
Cetirizine: A second-generation H1 antihistamine used for allergic rhinitis and urticaria, with possible drowsiness. It is a common alternative whose sedation profile can differ from desloratadine’s.
Active metabolite: A product of drug metabolism that retains pharmacological activity in the body. Desloratadine is the principal active metabolite of loratadine.
Allergic rhinitis: Inflammation of the nasal lining caused by an allergic response to airborne substances. This is a primary condition for which desloratadine relieves sneezing, itching, and runny nose.
Drug metabolism: Enzymatic chemical transformation of medicines in the body, often affecting their activity and elimination. Metabolism and liver function can affect desloratadine exposure and dosing considerations.

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