Which non‑sedating (second‑generation) antihistamines are appropriate for treating allergic‑type cold and cough in children, and what are the recommended doses for each age group?

Non-Sedating Antihistamines for Allergic Cold and Cough in Pediatrics

Second-generation antihistamines (cetirizine, desloratadine, fexofenadine, levocetirizine, and loratadine) are the appropriate non-sedating options for treating allergic rhinitis symptoms in children, but they should NOT be used for common cold or non-specific cough, as efficacy has not been established for these conditions. 1

Critical Distinction: Allergic vs. Infectious Symptoms

The most important clinical decision is differentiating allergic rhinitis from infectious upper respiratory tract infections (common cold). This distinction determines whether antihistamines are appropriate at all:

• For allergic rhinitis: Second-generation antihistamines are effective and safe 2, 1
• For common cold/viral URI: Antihistamines are NOT effective and should be avoided, especially in children under 6 years 1, 3
• Controlled trials have definitively shown that antihistamine-decongestant combinations are ineffective for upper respiratory infection symptoms in young children 1

Age-Specific Recommendations

Children Under 6 Years

Avoid ALL over-the-counter cough and cold medications (including first-generation antihistamines) in children younger than 6 years due to lack of efficacy and documented safety concerns, including 69 fatalities associated with antihistamines between 1969-2006. 1, 4

However, second-generation antihistamines ARE safe and appropriate for treating confirmed allergic conditions in young children:

• Cetirizine, desloratadine, fexofenadine, levocetirizine, and loratadine have excellent safety profiles when used for allergic rhinitis in young children 1
• These agents are well-tolerated with minimal sedation and no cytochrome P450 interactions 2, 5
• Alternative dosage forms (liquids, oral disintegrating tablets) facilitate administration to young children 5

Children 6 Years and Older

• Second-generation antihistamines remain the preferred choice for allergic rhinitis 2, 1
• These agents should be chosen over first-generation antihistamines due to reduced adverse effects and longer duration of action 2, 6

Specific Second-Generation Antihistamines

The following non-sedating antihistamines are recommended for pediatric allergic conditions:

• Cetirizine: Well-studied in children, including infants; may cause mild sedation in some patients 1, 5
• Desloratadine: Extensive pediatric data, including use in infants 1, 5
• Fexofenadine: Excellent safety profile with minimal sedation 1, 5
• Levocetirizine: Well-tolerated in young children 1, 5
• Loratadine: Established safety in pediatric populations 1, 5

All five agents have comparable efficacy for allergic rhinitis symptoms 2, 5

What NOT to Use

Avoid first-generation antihistamines (diphenhydramine, brompheniramine, chlorpheniramine) due to:

• Significant sedation and cognitive impairment 2, 6
• Antimuscarinic side effects 6
• 69 documented fatalities in children ≤6 years (1969-2006) 1, 4
• No superior efficacy compared to second-generation agents 2

Astemizole and terfenadine were removed from the market due to cardiotoxic effects. 2

Non-Specific Cough: A Special Consideration

Antihistamines should NOT be used empirically for chronic non-specific cough in children:

• Cochrane review found uncertain efficacy for prolonged non-specific cough 7
• If trialed, clinical response should occur within 2 weeks, or the medication should be discontinued 7
• The only exception is cetirizine for chronic cough specifically associated with seasonal allergic rhinitis, which showed benefit within 2 weeks 7

Superior Alternative for Allergic Rhinitis

Intranasal corticosteroids are more effective than oral antihistamines for allergic rhinitis and should be considered first-line therapy when nasal congestion is prominent. 1

• Intranasal corticosteroids are the most effective medication class for controlling allergic rhinitis symptoms 1
• They are safe at recommended pediatric doses with no clinically significant systemic effects 1
• They are more effective than combined antihistamine plus leukotriene antagonist therapy 1

Common Pitfalls to Avoid

• Do not confuse viral URI with allergic rhinitis: Parents and physicians often misidentify infectious rhinitis as allergic, leading to inappropriate antihistamine use 1
• Do not use antihistamines for asthma prevention: In infants with atopic dermatitis or family history of allergy, oral antihistamines should NOT be used to prevent wheezing or asthma 2
• Avoid medication errors: Overdose frequently results from simultaneous use of multiple cold/cough products, accidental exposures, or dosing errors 1, 4
• Do not prescribe off-label in children under 2 years without clear allergic indication: Most safety data are lacking in this age group 8

Practical Algorithm

1. Confirm allergic etiology (seasonal pattern, allergen exposure, associated symptoms like itching/sneezing)
2. If allergic rhinitis confirmed:
   • Choose a second-generation antihistamine (cetirizine, desloratadine, fexofenadine, levocetirizine, or loratadine) 2, 1
   • Consider intranasal corticosteroid if nasal congestion is prominent 1
3. If common cold/viral URI:
   • Do NOT use antihistamines, especially in children <6 years 1, 4
   • Supportive care only
4. If non-specific chronic cough:
   • Do NOT use antihistamines empirically 7
   • Investigate underlying cause