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Treatment of symptoms of Chronic Cough
Coughing is a normal reflex that helps clear the respiratory tract of secretions and foreign material. It also can result from irritation of the airway or from stimulation of receptors in the lung, diaphragm, ear (tympanic membrane), and stomach. The most common cause of acute cough is the common cold. Chronic cough is most often caused by irritation and excessive mucus production that results from cigarette smoking or from postnasal drainage associated with an allergic reaction.
Treatment includes humidification of the air to loosen secretions and to counteract the drying effect of coughing and inflammation. Moist air from a vaporizer or a hot shower helps, as do hot drinks and soups. Antihistamines are often used to treat acute cough, but their value is questionable if an allergy is not present. They may also cause additional drying of the respiratory mucosa. Guaifenesin is widely used in cough preparations to help liquefy secretions and aid expectoration. Decongestants reduce secretions by causing vasoconstriction of the nasopharyngeal mucosa. The most common decongestants found in many cough preparations are pseudoephedrine, phenylephrine, and phenylpropanolamine. They may cause high blood pressure, restlessness, and urinary retention and should be used with caution in anyone being treated for hypertension. Narcotics are powerful cough suppressants, codeine being the most frequently used. Several safer nonnarcotic antitussive (cough-preventing) agents are available such as dextromethorphan, which has almost equal effectiveness but fewer side effects. Most cough preparations containing dextromethorphan also contain a decongestant and an expectorant. Because coughing is an important defense mechanism in clearing secretions from blocked airways, a productive cough (one that produces secretions) should not be suppressed.
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