Essential oil of Rhododendron capitatwm Maxim, has beneficial effects in the treatment of bronchitis. Its hydrocarbon fraction possess eapectorand ant antitussive activities, whereas hydrocarbon-free fraction is able to inhibit evidently the common species of bacteria in the respiratory tract such as Bacillus influenzae, Diplococcus pneumoniae, Streptococcus viridans, Staphytococcus albus, Staphylococcus tetragenus, Bacillus subtilis etc.