The medicine is sprayed in the airway through nebulized inhalation for therapeutic purposes. Commonly used nebulized drugs directly through the nebulized inhalation use, does not need to add saline, do nebulization put saline is to extend the nebulization time of treatment. General nebulization to add saline for about 3-4ml, according to the situation of appropriate adjustment of the dose. The purpose is to extend the nebulization effect time, but also not a waste of drugs, can make the concentration in the nebulized drugs to reach a certain, effective concentration, to achieve the therapeutic purpose, prolong the efficacy of drugs. The time of nebulization is 15-20/times. The total amount of saline and other medication put into the nebulization can reach about 4-5ml.