A controlled, double-blind study of the effect of Quazolast on nasal challenge with ragweed antigen

N. K. Dave, S. C. McMahon, R. E. Grubbe, A. K. Bewtra, R. J. Hopp, N. M. Nair, J. Smith, R. G. Townley

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Quazolast is a potent mediator release inhibitor as determined by in vitro and in vivo testing. A placebo-controlled, double-blind, two-way crossover study compared the safety and efficacy of Quazolast, 400 mg bid orally, with placebo with 23 subjects with ragweed (RW) allergy, out of season. Subjects were assigned to two 7-day treatments in a random sequence with an 8-day washout. Subjects were challenged on days 1 and 7 of each trial with serial dilutions (10, 100, 1000, 1350, and 2700 PNU/0.135 mL) of RW, using metered pump spray bottles, (two sprays delivered 0.135 mL), preceded by saline control. Efficacy evaluation consisted of nasal flow rates measured by rhinomanometry, sneeze counts, nasal itchiness scores, and weight of nasal secretions during challenges. During Quazolast treatment, subjects had significantly lower (P <.05) mean percent decreases in nasal flow rate at 1350 and 2700 PNU. Nasal itchiness scores were significantly lower (P <.05) during Quazolast treatment than placebo at 1000, 1350, and 2700 PNU. Although sneeze counts were lower during treatment with Quazolast than with placebo, the results did not reach statistical significance. No significant improvement was seen in the weight of nasal secretion. Adverse experiences, clinical laboratory results, and physical examinations were unremarkable, posttreatment. Quazolast was superior to placebo in protecting against nasal congestion and nasal itchiness after ragweed nasal challenge.

Original languageEnglish (US)
Pages (from-to)298-302
Number of pages5
JournalAnnals of allergy
Issue number4
StatePublished - Jan 1 1990

All Science Journal Classification (ASJC) codes

  • Immunology and Allergy


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