The invention discloses antimicrobial usefulness of Nepeta ciliaris (Jupha) root essential oil as inhalant against respiratory tract bacterial as well as fungal organisms. The essential oil vapours are inhaled as a practical method to reduce the risks of infection by the microorganisms causing respiratory diseases. The essential oil has unique fragrance with the function of bacteriostasis and disinfection. Convenient hand-held inhaler apparatus can provide the inhalation of vapours. Aromatherapeutic products having the antimicrobial functions can be prepared also.