Nebulized drugs are more and each nebulized drug composition is different, how long after opening will be ineffective is there will be a certain difference, under normal circumstances when opening the nebulized drugs, should be used in a timely manner, preferably within two hours, the latest do not exceed eight hours. If the time is too long the effect of nebulized drugs will be a significant decline, but also easy to breed bacteria leading to deterioration. It is recommended that when using nebulized drugs in general, it is best to choose reasonable medication according to the specific circumstances of their own conditions, do not open too much at once, so as not to run out of spoilage, and at the same time in the use of drugs, to keep an eye on the recovery of the disease, if there are symptoms of discomfort during the use of nebulized drugs, to promptly stop the observation.