Treatment of Chronic Cough

Introduction to Chronic Cough Treatment

The American College of Chest Physicians recommends systematically treating the three most common causes of chronic cough—upper airway cough syndrome (UACS), asthma, and gastroesophageal reflux disease (GERD)—using sequential empiric therapy, as these account for over 80% of cases and frequently coexist 1, 2, 3

Discontinuing ACE inhibitors immediately can resolve cough in days to 2 weeks (median 26 days) in patients taking one 3, 4
Counseling smoking cessation aggressively is recommended, as 90% of patients with chronic bronchitis will have cough resolution after quitting 3
Obtaining chest radiograph and spirometry is necessary to rule out serious pathology and assess for obstructive or restrictive patterns 4

The American College of Chest Physicians recommends starting a first-generation antihistamine/decongestant combination as first-line empiric therapy for UACS 3, 4
Newer non-sedating antihistamines are ineffective for UACS—first-generation agents are required 3
Expect response within 1-2 weeks, though complete resolution may take several weeks 3, 4
Adding saline nasal irrigation and humidification as supportive measures is recommended 5
Considering intranasal corticosteroids if nasal symptoms persist is recommended 5
Initiating inhaled corticosteroids (ICS) combined with long-acting β-agonists (LABA) is recommended for asthma treatment after 2-4 weeks if cough persists 3, 4
ICS alone is recommended for non-asthmatic eosinophilic bronchitis (NAEB) when airway eosinophilia is confirmed 1
Starting proton pump inhibitor (PPI) therapy with dietary modifications is recommended for GERD treatment if inadequate response after 1-2 months 2, 3

First-line treatment for non-asthmatic eosinophilic bronchitis (NAEB) is inhaled corticosteroids when airway eosinophilia is confirmed by sputum induction or bronchial wash 1
Identifying and avoiding causal allergens or occupational sensitizers when possible is recommended for NAEB 1
Using oral corticosteroids if symptoms persist despite high-dose ICS is recommended for NAEB 1
Short-term central cough suppressants (codeine or dextromethorphan) are recommended for symptomatic relief in chronic bronchitis 1
Giving a 10-15 day course of systemic corticosteroids (IV for hospitalized patients, oral for ambulatory patients) is recommended for acute exacerbations of chronic bronchitis 1
Using bronchodilators when airflow obstruction or bronchial hyperreactivity is present is recommended for bronchiectasis 1
Considering prolonged antibiotic therapy for idiopathic bronchiectasis to reduce sputum volume and purulence is recommended 1

Gabapentin is recommended as a neuromodulatory agent, starting at doses used in the Ryan trial, with reassessment of risk-benefit at 6 months 6
Considering speech pathology interventions for cough hypersensitivity syndrome is recommended 6
Morphine may be considered only when all other therapeutic options have failed, with close follow-up at 1 week then monthly 6

Never assuming a single cause—using sequential and additive therapy as multiple conditions frequently coexist is recommended 3, 4
Not using newer non-sedating antihistamines for UACS—they are ineffective 3
Not stopping partially effective treatments when adding new therapies—maintaining all treatments that provide benefit is recommended 3
Not assuming GERD is ruled out if empiric treatment fails—the therapy may not have been intensive enough, and objective investigation is then warranted 2
Avoiding codeine and dextromethorphan in first trimester pregnancy except with extreme caution is recommended 5

Red flags requiring immediate investigation include fever, night sweats, weight loss, hemoptysis, history of tuberculosis or cancer, abnormal chest radiograph 5
Considering referral to pulmonology or otolaryngology if cough persists despite 4-6 weeks of sequential empiric therapy for all three common causes is recommended 3
High-resolution CT scan is indicated for suspected bronchiectasis without characteristic chest radiograph findings 1

UACS: 1-2 weeks for initial improvement 3, 4
Asthma: 2-4 weeks 3, 4
GERD: 1-3 months 2, 3
Overall resolution may require maintaining all partially effective treatments for several months 3