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- ArticleGirard JP, Cuevas M.Acta Allergol. 1977 Feb;32(1):27-34.A clinical trial was performed with a new substance (HC 20-511) derived from the cycloheptothiophene group used in the management of asthma. Twenty-four asthma patients were treated at random, with HC 20-511 or placebo or the antihistaminic substance, clemastin (Tavegyl). A statistical evaluation of the results unequivocally demonstrates good protection with a single dose of 2.0 mg or two times 1.0 mg for 3 days against a challenging antigen, compared with the placebo or the antihistaminic agent. Tolerance was excellent.