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Efficacy double-blind, crossover study of sodium cromoglycate in patients with seasonal allergic rhinitis.

In a double-blind, crossover, placebo-controlled study, consisting of 100 clinical trials, the active drug (sodium cromoglycate) was effective in 83.2%, while in 11.6% the placebo was judged more effective (p less than 0.0001). Four patients suffered minor side effects. No deleterious effect on the nasal mucosa was noticed and no one complained that the drug produced sedation.