Patients (40) with various types of bronchial asthma were treated with disodium cromoglycate (DSCG) for various periods of time ranging from 30 days-9 mo. The drug was inhaled through a spinhaller at 8-h intervals. The symptoms of asthma, the respiratory function and the drug-induced reactions were checked during treatment. DSCG was salutary in .apprx. 80% of the patients with extrinsic asthma (even in those with pollen allergy diagnosed within the pollination period). The drug was effective in patients with exercise-induced asthma, asthma associated with pregnancy and asthma with adrenocorticosteroid psychosis. The patients with meal allergy (bakers and millers) treated with DSCG were able to keep their occupational activities. The drug may be used in the intrinsic asthma only in subjects with many positive skin tests and hypereosinophilia.