title: The evidence for the use of oral mucolytic agents in chronic obstructive pulmonary disease (COPD).
abstract: BACKGROUND
  Oral mucolytics are now recommended in some treatment guidelines for the management of chronic obstructive pulmonary disease (COPD). This article reviews the evidence for their use and their possible benefits.
  
  
  METHODS
  The review is based upon peer reviewed publications relating to the use of mucolytics in COPD cited in PubMed.
  
  
  RESULTS
  Much of the published evidence is of somewhat poor quality and many studies include patients with both chronic bronchitis and COPD. Mucolytics reduce exacerbations by up to 0.8 exacerbations per year, but have little additional benefit in those on standard maximum therapy.
  
  
  RESULTS
  Data that mucolytics improve symptoms, alter mucus or impact health-related quality of life in COPD patients receiving other standard therapy are unconvincing. In those on little or no other treatment, they may reduce exacerbation rate.
  
  
  CONCLUSIONS
  The use of mucolytics to treat acute exacerbations is promising.
  
  
  CONCLUSIONS
  Head-to-head trials of mucolytics versus long-acting bronchodilators and/or inhaled corticosteroids are lacking. Even in patients with severe COPD who remain symptomatic despite maximal inhaled therapy the role of mucolytics remains unproven.
authors.affiliation: Aintree Chest Centre, University Hospital Aintree, Lower Lane, Liverpool, UK.
authors.forename: L
authors.initials: L
authors.lastname: Davies
authors.forename: P M A
authors.initials: PM
authors.lastname: Calverley
mesh_terms: D000284:Administration, Oral; D005100:Expectorants / Q000627:therapeutic use*; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000188:drug therapy*; D016896:Treatment Outcome
chemical_list: D005100:Expectorants