GK
Subcutaneous injection is the parenteral route. The word parenteral mean outside the intestines, but in common use it is usually limited to injections.
Explanation
Guaifenesin is the only expectorant approved for use in OTC cought remedies. It stimualtes the reflex production of bronchial secretions by irritating the gastric mucosa. These bronchial secretions relieves a dry, irritating cough.
Expectorants promte the expulsion of mucus, phlegm and fluid from the lungs and bronchial passages. This enhances the productiveness of a cough. It does so by stimulating the production of bronchial secretions which can than 'capture' the phlegm, mucus and fluid as it is being swept up the mucociliary escalator found within the respiratory tract.
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