Aerosol is suspension of liquid or solid particles in a carrier gas, which makes use of it for treatment of respiratory system related diseases. Different forms of drugs can be utilized for aerosol therapy such as solid particles, liquid particles, solutions, and suspensions. Until recently, aerosol therapy concentrated primarily on treatment of asthma and COPD for which, pressurized metered-dose inhaler device was used. However, the role of aerosol therapy is expanding beyond the initial focus.

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