ANTI‐ASTHMATIC PROPERTIES OF A NEW PERORAL DRUG (HC 20–511.)

Abstract
A clinical trial was performed with a new substance (HC 20-511) [4-(1-methyl-4-piperidylidene)-4H] derived from the cycloheptothiophene group used in the management of asthma. Asthma patients (24) were treated at random with HC 20-511 or placebo or the antihistaminic substance clemastine (Tavegyl). A statistical evaluation of the results unequivocally demonstrated good protection with a single dose of 2.0 mg or 2 times 1.0 mg for 3 days against a challenging antigen, compared with the placebo or the antihistaminic agent. Tolerance was excellent.