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  • Title: Levocabastine. A review of its pharmacological properties and therapeutic potential as a topical antihistamine in allergic rhinitis and conjunctivitis.
    Author: Dechant KL, Goa KL.
    Journal: Drugs; 1991 Feb; 41(2):202-24. PubMed ID: 1709851.
    Abstract:
    Levocabastine is a long acting, highly potent and selective histamine H1-receptor antagonist, which has been developed for nasal and ocular administration. In controlled trials performed to date levocabastine was effective and well tolerated in the treatment of allergic rhinitis and allergic conjunctivitis. Comparative studies have demonstrated that levocabastine is superior to placebo and at least as effective as sodium cromoglycate (cromolyn sodium) in alleviating symptoms associated with seasonal allergic conditions. Although levocabastine appears to be less effective than the topical corticosteroid beclomethasone with regard to relieving runny and blocked nose, further comparative trials between these 2 agents would be desirable. Similar to other antihistamines, levocabastine provides minimal relief of nasal blockage, but this symptom is believed to be mediated by receptors other than histamine H1. The prompt onset of antiallergic activity after application differentiates levocabastine from the reference topical antiallergic, sodium cromoglycate, which has an onset of efficacy characterised by a lag period, thereby necessitating maintenance treatment. The incidence of adverse effects associated with levocabastine therapy is low and is similar to that observed with placebo and sodium cromoglycate. Levocabastine provides prophylactic protection as well as acute relief from nasal and ocular symptoms in patients with seasonal allergic disorders. With the ever increasing trend towards topical therapy for the treatment of allergic rhinitis and allergic conjunctivitis, levocabastine is a useful addition to the range of drugs currently available. Possible avenues for additional research should include determining whether the antiallergic efficacy of topical levocabastine is superior to that of oral agents such as astemizole and terfenadine, and whether topical therapy is indeed preferred, considering the relative ease of administration of effective oral antiallergic agents.
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