Inhaler use in treatment of cough
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Inhaler Use for Cough Suppression: Effectiveness and Indications
Inhalers are widely used in the treatment of cough, especially when the cough is related to respiratory conditions such as asthma, chronic obstructive pulmonary disease (COPD), and certain forms of chronic cough. The main types of inhalers used include corticosteroids, bronchodilators, and other anti-inflammatory agents.
Inhaled Corticosteroids for Cough Variant Asthma and Chronic Cough
Inhaled corticosteroids, such as budesonide and fluticasone, are effective in controlling cough symptoms in patients with cough variant asthma (CVA) and chronic cough. Studies show that most patients with CVA experience significant improvement in cough symptoms after using inhaled corticosteroids, with high rates of symptom relief and improved quality of life Arif2023Ju2016Ping2005+3 MORE. Longer treatment durations (at least six months) with inhaled corticosteroids are associated with lower relapse rates after stopping the medication, and these treatments are generally safe with minimal side effects Ju2016Tuzuner2015.
In adults with chronic cough and elevated fractional exhaled nitric oxide (FeNO), a short-term trial of high-dose inhaled corticosteroids can lead to significant improvement in cough severity and quality of life, supporting guideline recommendations for their use in this group .
Bronchodilator and Lidocaine Inhalation in COPD-Related Cough
For patients with COPD experiencing intractable cough, both nebulized lidocaine and bronchodilator inhalation (such as terbutaline) are effective for rapid, short-term cough suppression. Both treatments significantly reduce cough severity within an hour, and their efficacy is similar. Side effects are generally mild and do not lead to discontinuation of therapy .
Inhaler Device Type: Dry Powder Inhaler (DPI) vs. Metered Dose Inhaler (MDI)
The type of inhaler device—whether dry powder inhaler (DPI) or pressurized metered dose inhaler (MDI)—does not significantly affect the efficacy of cough treatment in patients with cough variant or cough-predominant asthma. Both devices are equally effective, and switching between them, especially with proper inhalation technique training, can further improve asthma control and reduce cough severity .
Combination Inhalers and Step-Up Therapy for Persistent Cough in Asthma
For patients with asthma and persistent cough despite standard inhaled corticosteroid/long-acting beta-agonist (ICS/LABA) therapy, switching to a combination inhaler containing indacaterol, glycopyrronium, and mometasone (IND/GLY/MF) or stepping up to a higher dose of ICS/LABA may provide additional symptom relief. Ongoing studies are evaluating the effectiveness of these strategies for improving cough-specific quality of life .
Inhaled Sodium Cromoglicate for Chronic Cough in Idiopathic Pulmonary Fibrosis
A novel inhaled formulation of sodium cromoglicate (PA101) has shown promise in reducing cough frequency in patients with idiopathic pulmonary fibrosis (IPF), but not in those with chronic idiopathic cough. This suggests that the effectiveness of inhaled treatments may depend on the underlying cause of the cough .
Safety and Side Effects of Inhaled Treatments
Inhaled treatments for cough, including corticosteroids and bronchodilators, are generally safe. Short-term use of inhaled steroids does not appear to negatively affect voice parameters, and long-term use in children does not significantly impact bone mineral density or cortisol levels Ju2016Tuzuner2015. Mild side effects such as oropharyngeal numbness, bitter taste, tremor, and palpitations may occur but are usually not severe enough to stop treatment .
Conclusion
Inhalers, particularly those containing corticosteroids and bronchodilators, are effective and safe options for treating cough associated with asthma, COPD, and certain chronic cough conditions. The choice of inhaler type and duration of therapy should be tailored to the patient’s underlying condition and response to treatment. Proper inhalation technique and patient selection are important for optimizing outcomes. Ongoing research continues to refine the best approaches for managing cough with inhaled therapies.
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