The examination were carried out in a group of 14 patients with mild bronchial asthma. The effect of Berodual (1 dose = 0.02 mg ipratropium bromide + 0.05 mg fenoterol), ipratropium bromide (Atrovent, 1 dose = 0.02 mg) and fenoterol (Berotec, 1 dose = 0.2 mg) were assessed. All the drugs were administered 3 x 2 doses/daily, except Berotec--3 x 1 dose/daily--during 14 days. Dyspnoea, cough, sputum scores were calculated and values of FEV1, FVC, FEF25-75 and PC20 (mg/ml metacholine) were measured. All this drugs after 2 weeks therapy statistically significantly reduced dyspnoea, cough and sputum. The best bronchodilating and protective effect were observed after Berodual compare with Atrovent or Berotec.