The system in living organisms that takes up oxygen and discharges carbon dioxide in order to satisfy energy requirements. The respiratory system consists of all the organs involved in breathing. These include the nose, pharynx, larynx, trachea, bronchi and lungs. The respiratory system does two very important things: it brings oxygen into our bodies, which we need for our cells to live and function properly; and it helps us get rid of carbon dioxide, which is a waste product of cellular function.In humans the respiratory tract is the part of the anatomy involved with the process of respiration.The respiratory tract is divided into 3 segments:upper respiractory tract,Respiratory airways,Lungs.The respiratory tract is a common site for infections.
A bronchodilator is a substance that dilates the bronchi and bronchioles, decreasing resistance in the respiratory airway and increasing airflow to the lungs. Bronchodilators may be endogenous (originating naturally within the body), or they may be medications administered for the treatment of breathing difficulties. They are most useful in obstructive lung diseases, of which asthma and chronic obstructive pulmonary disease are the most common conditions. Although this remains somewhat controversial, they might be useful in bronchiolitis. They are often prescribed but of unproven significance in restrictive lung diseases.
Bronchodilators are either short-acting or long-acting. Short-acting medications provide quick or ""rescue"" relief from acute bronchoconstriction. Long-acting bronchodilators help to control and prevent symptoms. The three types of prescription bronchodilating drugs are ?2-agonists (short- and long-acting), anticholinergics (short-acting), and theophylline (long-acting).
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