<I>Anti-histamines for prolonged non-specific cough in children</I>

Chang AB, Peake J, McElrea MS

Published Online:

February 17, 2010

Children with non-specific cough are commonly treated with a variety of medications to treat the symptom of cough. The objective of this review was to evaluate the effectiveness of anti-histamines in children with prolonged cough that is not related to an underlying respiratory disease, that is, non-specific chronic cough. We included three therapeutic studies with 182 randomised participants. Two studies found that chronic cough significantly improved in both treatment and placebo groups with no difference between the two groups. One small study however described that children who had chronic cough associated with seasonal allergic rhinitis treated with cetirizine improved significantly more than children on placebo and this difference was evident by two weeks. Four studies that evaluated safety profiles included 3166 randomised participants and described a non significant increase in cough in participants who received the active medication. Despite the limitations of this review, our findings are similar to the review on anti-histamines for acute cough which showed no good evidence for or against the use of anti-histamines. In contrast to recommendations in adults with chronic cough, anti-histamines cannot be recommended as empirical therapy for children with chronic cough. Further research examining the effects of this treatment using child appropriate cough outcome measures is needed.

Abstract (click to read)

Background:

Non-specific cough is defined as non-productive cough in the absence of identifiable respiratory disease or known aetiology. It is commonly seen in paediatric practice. These children are treated with a variety of therapies including anti-histamines. Also, anti-histamines are advocated as an empirical treatment in adults with chronic cough.

Objectives:

To evaluate the effectiveness of anti-histamines in treating children with prolonged non-specific cough.

Search strategy:

We searched the Cochrane Register of Controlled Trials (CENTRAL), MEDLINE, OLDMEDLINE and EMBASE databases. The latest searches were performed in November 2009.

Selection criteria:

All randomised controlled trials comparing anti-histamines with a placebo or placebo-like medication with cough as an outcome, where cough is not primarily related to an underlying respiratory disorder such as cystic fibrosis, asthma, or suppurative lung disease.

Data collection and analysis:

Two review authors independently assessed study quality and extracted data.

Main results:

Three included therapeutic studies had 182 randomised participants with 162 completing the trials although in one study, children with recurrent wheeze were also included. The four included safety evaluation studies randomised 3166 participants with 2862 completing the trials. Clinical heterogeneity was evident and limited data prevented combining data for meta-analysis. The two larger therapeutic studies described significant improvement in both the intervention and the placebo/placebo-like arms with no significant difference between the two groups. In the study with the smallest sample size, cetirizine (a second generation anti-histamine) was significantly more efficacious than placebo in reducing chronic cough in children associated with seasonal allergic rhinitis, and the effect was seen within two weeks of therapy. In contrast three of the larger evaluation studies that enrolled children with allergic rhinitis described a non-significant increase in cough as an adverse event. Combined data from the four safety evaluation studies revealed a non-significant difference between groups (OR 1.47 , 95% CI 0.86, 2.49) for cough as an adverse event but the trend favoured the placebo arm.

Authors' conclusions:

This review has significant limitations. However, our finding of uncertain efficacy of anti-histamines for chronic cough are similar to that for acute cough in children. In contrast to recommendations in adults with chronic cough, anti-histamines cannot be recommended as empirical therapy for children with chronic cough. If anti-histamines were to be trialled in these children, current data suggest a clinical response (time to response) occurs within two weeks of therapy. However the use of anti-histamines in children with non-specific cough has to be balanced against the well known risk of adverse events especially in very young children.

This record should be cited as:

Chang AB, Peake J, McElrea MS. Anti-histamines for prolonged non-specific cough in children. Cochrane Database of Systematic Reviews 2008, Issue 2. Art. No.: CD005604. DOI: 10.1002/14651858.CD005604.pub3

Assessed as up to date:

November 13, 2009

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Primary Review Group:

Airways Group

PEARLS - Practical Evidence About Real Life Situations (click to read)

Clinical question:

Are antihistamines effective for prolonged non-specific cough in children?

Bottom line:

Two studies found that chronic cough significantly improved in both treatment and placebo groups with no difference between the two groups. One small study, however, reported that children who had chronic cough associated with seasonal allergic rhinitis who were treated with cetirizine improved significantly more than children on placebo, and this difference was evident by two weeks.

Caveat:

The three included studies were different in several ways. There was some clinical heterogeneity in the participants of the studies (different age groups), all of three studies used a different type of antihistamine, and in two studies children had allergic rhinitis arguably antihistamines would be more efficacious in these children.

Context:

Non-specific cough is defined as non-productive cough in the absence of identifiable respiratory disease or known aetiology. It is a common condition, and children are treated with a variety of therapies, including antihistamines.

Cochrane Systematic Review:

Chang AB et al. Antihistamines for prolonged non-specific cough in children. Cochrane Reviews 2008, Issue 2. Art. No.: CD005604. DOI: 10.1002/14651858.CD005604.pub3. This review contains five trials involving 1,145 participants.

Authored by:

Brian R McAvoy

Cochrane Primary Health Care Field

Health topics:

Lungs & airways > Chronic cough

Cochrane Summaries^beta

Independent high-quality evidence for health care decision making

<I>Anti-histamines for prolonged non-specific cough in children</I>

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