Respiratory System Agents is a drug that acts on the respiratory system. The respiratory system is the general term for the organs that perform gas exchange between the body and the outside world, including the respiratory tract and lungs. Any organism in nature, including plants, animals and microorganisms, has the phenomenon of breathing. The drugs mainly used in the respiratory system include two aspects: one is the cause, including antimicrobials, fungi, viruses, parasites, etc.; the other is symptomatic, eliminate or alleviate respiratory symptoms. Common respiratory drugs are antitussive, antiasthmatic, leukotriene modifiers, lung surfactants and so on.
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