Antiallergic activity of loratadine a non sedating antihistamine


Two hundred and ten patients with chronic urticaria were divided into two groups; one group was treated with Loratadine 10mg daily while the other with cetirizine 10mg daily. Pretreatment and post-treatment evaluations were made. It was noticed that loratadine was superior to cetirizine in terms of a rapid onset of actions, overall clinical efficacy and minimal side effects.

Patients with severe hepatic (liver) disorders may need to start with a lower dose.

Both drugs inhibit the release of histamine from human basophils.

Loratadine, in addition, inhibits other inflammatory mediators like PGD2 and LTC[5-6] via interference with calcium transport across the cell membrane[7] and the expression of adhesion molecules[8] which may be either from the selectin, immunoglobulin or integrin families and are involved in the aetiopathogenesis of allergic inflammation.

as natural source due to the existing modern medicine give various adverse effects to overcome these problems with natural products. noctiflora leaves extract was fractionated with column chromatography; the homogenized fractions were monitored with thin layer chromatography (TLC) and characterized by using UV-visible, FT-IR, 1H NMR, 13C NMR and mass spectrometry spectral studies. noctiflora extract were analysed by gas chromatography-mass spectrometry. noctiflora leaves extract were screened for their antioxidant and antihistamine potential in vitro (2,2-diphenyl-1-picrylhydrazyl radical scavenging activity, 2,2'-azinobis-3-ethylbenzothiozoline-6-sulfonic acid radical decolouration assay, nitric oxide radical scavenging activity, superoxide radical scavenging activity and hydrogen peroxide radical scavenging activity) and in silico (molecular docking), respectively.

Results: Antioxidant and antihistamine barlerinoside has been isolated and characterized from the leaves of B. Barlerinoside revealed their free-radical scavenging ability on OH-, OH•, NO-, O2- and H2O2 radicals and found high percentage inhibition against OH- radical at the IC50 value of 50.45±2.52 µg. noctiflora leaves contains cyclotene; N, N-dimethylglycine; tetrahydrocyclopenta [1,3] dioxin-4-one; phenol, 2-methoxy-; benzofuran, 2-methyl-; 1,4:3,6-dianhydro-α-d-glucopyranose; 2-methoxy-4-vinylphenol; 1,3;2,5-dimethylene-l-rhamnitol; levoglucosan and bicyclo[2.2.2]oct-7-ene-2,5-dione as being the major compounds.

The ongoing identification of immune effector cells and mediators involved in the allergic cascade indicates that further research is necessary to define the role of antihistamines such as desloratadine in anti-inflammatory therapy.

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