title: Desloratadine therapy for symptoms associated with perennial allergic rhinitis.
abstract: BACKGROUND
  Perennial allergic rhinitis (PAR) has a substantial negative social and economic impact. Recent studies emphasize the potential seriousness of PAR and the need for improved treatment of this condition.
  
  
  OBJECTIVE
  To confirm the efficacy and safety of the H1-antihistamine desloratadine in reducing the symptoms of PAR in a randomized, double-blind, placebo-controlled trial.
  
  
  METHODS
  Patients with PAR (N = 1,179) from 67 US/international centers received desloratadine, 5 mg once daily, or identical placebo tablets. The primary efficacy measure was the change from baseline to week 4 in average morning and evening reflective total symptom scores (TSSs). Secondary end points included changes from baseline in total nasal and nonnasal symptom scores and peak nasal inspiratory flow (PNIF) rates.
  
  
  RESULTS
  Desloratadine was significantly more effective than placebo in reducing morning and evening reflective TSSs for each week and during weeks 1 through 4 (P = .001). Mean changes in TSSs during the 4-week study were -3.9 (26.6% reduction) and -3.2 (22.3% reduction) for the desloratadine and placebo groups, respectively (P = .001, desloratadine vs placebo). With desloratadine therapy, significant improvements were also seen in secondary efficacy end points compared with placebo use (total nasal and nonnasal symptom scores: P < or = .04). Improvements in mean morning PNIF were significantly greater in the desloratadine-treated group than in the placebo group (P = .03).
  
  
  CONCLUSIONS
  These results confirm and extend previous findings that desloratadine is safe and is associated with a statistically significant reduction in nasal and nonnasal symptoms in patients with PAR. Objective nasal airflow, evaluated by PNIF, was statistically significantly improved after desloratadine treatment.
authors.affiliation: West Coast Clinical Trials, LLC, Long Beach, California 92626, USA. drkkim@wcctrials.com
authors.forename: Kenneth
authors.initials: K
authors.lastname: Kim
authors.forename: Gordon
authors.initials: G
authors.lastname: Sussman
authors.forename: Jacques
authors.initials: J
authors.lastname: Hébert
authors.forename: William
authors.initials: W
authors.lastname: Lumry
authors.forename: Barry
authors.initials: B
authors.lastname: Lutsky
authors.forename: Davis
authors.initials: D
authors.lastname: Gates
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D004311:Double-Blind Method; D005260:Female; D039563:Histamine H1 Antagonists, Non-Sedating / Q000009:adverse effects / Q000627:therapeutic use*; D006801:Humans; D017336:Loratadine / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D012221:Rhinitis, Allergic, Perennial / Q000175:diagnosis / Q000188:drug therapy*; D016896:Treatment Outcome
chemical_list: D039563:Histamine H1 Antagonists, Non-Sedating; D017336:Loratadine; C121345:desloratadine