Background. Evaluation of the efficacy and safety of the drug Foster (fixed combination of beclomethasone di-propionate 100 mcg and formoterol 6 micrograms per single dose) in metered-dose aerosol inhaler technology Modulite® in patients with bronchial asthma (BA). Methods. Prospective non comparative multicenter open observational study. Study group consisted of 120 practicing physicians from the 92 hospitals in 21 cities of Russia. Analyzed 557 case report forms of patients with moderate persistent asthma treated with Foster during 12 weeks who needed to correct the basic therapy (according to asthma control criteria GINA 2006). Results. The effectiveness of treatment with Foster was observed in 555 (99,6%) of 557 patients, who showed improvement in lung function, decreased severity of symptoms, reducing the need for symptomatic therapy compared with baseline and improved asthma control in general. Conclusions. In most cases, control over moderate and severe persistent asthma can be improved by the combined therapy of inhaled steroids (ICS) and в2-agonist long-acting (LABA). In this case, Foster is a drug of choice with a fixed combination of ICS and LABA. Extra-fine form of the drug (thanks to innovative technology Modulite®) is evenly distributed in central and peripheral airways, providing good therapeutic effect of using of low doses of ICS and reducing the likelihood of side effects.