Nasal decongestants in monotherapy for the common cold

Area of Science:

• Pharmacology
• Clinical Medicine
• Evidence-Based Medicine

Background:

• Over-the-counter common cold treatments are widely available, yet robust evidence on nasal decongestant efficacy and safety is lacking.
• Nasal decongestants are frequently used to alleviate common cold symptoms, necessitating a thorough evaluation of their therapeutic value.
• Existing research on nasal decongestants for the common cold presents limited data on effectiveness and safety profiles.

Purpose of the Study:

• To systematically evaluate the efficacy and safety of nasal decongestants when used as monotherapy for common cold symptom relief.
• To assess both short-term and long-term safety outcomes associated with nasal decongestant use in adults and children.
• To synthesize evidence from randomized controlled trials (RCTs) comparing nasal decongestants with placebo.

Main Methods:

• Conducted a comprehensive literature search across multiple databases including CENTRAL, MEDLINE, Embase, CINAHL, LILACS, and clinical trial registers.
• Included randomized controlled trials (RCTs) and cluster-RCTs assessing nasal decongestants (oral or topical) versus placebo for common cold symptoms.
• Extracted data on subjective and objective measures of nasal congestion, overall well-being, and adverse events; meta-analyses were performed where possible.

Main Results:

• Limited evidence precluded conclusions on single-dose nasal decongestant effectiveness.
• Multi-dose nasal decongestants showed a statistically significant, but small (SMD 0.49), improvement in subjective nasal congestion in adults.
• Nasal decongestants did not appear to increase the risk of adverse events compared to placebo in adults (OR 0.98).

Conclusions:

• Multi-dose nasal decongestants may offer a small benefit for adult nasal congestion, but clinical relevance is uncertain due to low-quality evidence.
• Insufficient data exists to conclude on the effectiveness of single-dose decongestants or to compare oral versus topical formulations.
• The effectiveness and safety in children, and the long-term impact in adults, remain undetermined, warranting further high-quality research.