What are the first‑line (primary) and second‑line (secondary) treatments for cough, including supportive care and pharmacologic options, in adults and children older than one year?

Primary and Secondary Cough Treatments

For children with acute cough, honey is the only first-line treatment with evidence of benefit, while over-the-counter cough medications should be avoided due to lack of efficacy and potential harm; for chronic wet cough in children, antibiotics targeting common respiratory bacteria are first-line, and for adults with acute cough, dextromethorphan at 60mg (not the typical lower OTC doses) or menthol inhalation provide short-term symptomatic relief, though treating the underlying cause remains paramount. 1, 2

Children (>1 year old)

Acute Cough - Primary Treatment

• Honey is the only recommended first-line agent, offering more relief than no treatment, diphenhydramine, or placebo (though not superior to dextromethorphan) 1
• Avoid OTC cough and cold medicines - they should not be prescribed as they have not been shown to make cough less severe or resolve sooner 1
• Critical safety warning: Preparations containing antihistamines and dextromethorphan are associated with adverse events, including reported deaths from toxicity in young children 1
• Absolutely avoid codeine-containing medications due to potential for serious side effects including respiratory distress 1

Acute Cough - Secondary Treatment

There are no evidence-based secondary pharmacologic options for symptomatic relief in children with acute cough. The focus should shift to identifying underlying causes if cough persists beyond expected timeframes.

Chronic Wet/Productive Cough - Primary Treatment

For chronic wet cough (>4 weeks) without specific cough pointers (like coughing with feeding or digital clubbing):

• 2 weeks of antibiotics targeting Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis based on local antibiotic sensitivities 3, 1
• If cough resolves within 2 weeks, diagnose as protracted bacterial bronchitis (PBB) 3, 1

Chronic Wet/Productive Cough - Secondary Treatment

• If wet cough persists after 2 weeks: Add an additional 2 weeks of appropriate antibiotics 3, 1
• If wet cough persists after 4 weeks total: Proceed to further investigations (flexible bronchoscopy with quantitative cultures, chest CT) 3, 1

Chronic Dry Cough in Children

Cough should be treated based on etiology - there is no evidence for using medications for symptomatic relief of cough in children 1

• Antihistamines have minimal to no efficacy in relieving cough in children (unlike adults) 1
• Empirical treatment for upper airway cough syndrome, GERD, or asthma should NOT be used unless other features consistent with these conditions are present 4
• If an empirical trial is attempted, it must be of defined limited duration to confirm or refute the diagnosis 4

Adults

Acute Cough - Primary Treatment

For acute viral cough (common cold, acute bronchitis):

• Dextromethorphan 60mg (not the typical subtherapeutic OTC doses) - maximum cough reflex suppression occurs at this dose with prolonged effect 2
• Menthol inhalation (menthol crystals BPC or proprietary capsules) - provides acute, short-lived cough suppression 2
• Simple home remedies like honey and lemon may be as effective as commercial preparations 2

Important caveat: Central cough suppressants (codeine, dextromethorphan) have limited efficacy for cough due to upper respiratory infections and are not recommended for this use 5

Acute Cough - Secondary Treatment

• Sedative antihistamines (first-generation) may be suitable specifically for nocturnal cough, though they cause drowsiness 2
• Codeine or pholcodine are NOT recommended - they have no greater efficacy than dextromethorphan but significantly more adverse effects 2

Chronic Bronchitis - Primary Treatment

• Peripheral cough suppressants (levodropropizine, moguisteine) for short-term symptomatic relief 5, 6
• Ipratropium bromide (inhaled) - the only recommended inhaled anticholinergic for cough suppression 5

Chronic Bronchitis - Secondary Treatment

• Central cough suppressants (codeine, dextromethorphan) for short-term symptomatic relief 5
• Note: Agents that alter mucus characteristics are NOT recommended for cough suppression 5

Postinfectious Cough (3-8 weeks duration) - Treatment Algorithm

1. Inhaled ipratropium bromide as first-line to attenuate cough 7
2. Inhaled corticosteroids if cough persists and adversely affects quality of life despite ipratropium 7
3. Prednisone 30-40mg daily for short, finite period for severe paroxysms (only after ruling out upper airway cough syndrome, asthma, GERD) 7
4. Central antitussives (codeine, dextromethorphan) when other measures fail 7

Critical Clinical Pitfalls

1. Do not use antibiotics for acute viral cough - they have no role 7
2. OTC medications in children under 4 years are contraindicated per FDA warning; prescription opioid cough medicines limited to adults ≥18 years as of 2018 1
3. Most OTC cough medication doses are subtherapeutic - dextromethorphan requires 60mg for maximum effect, not the typical 10-20mg in commercial preparations 2
4. Children are not small adults - antihistamines work in adults but have minimal efficacy in children 1
5. Always follow up if medications are used - cease medications if no effect within expected timeframe 1
6. Address environmental influences regardless of diagnosis (smoke exposure, irritants) 1
7. Voluntary cough suppression may be sufficient to reduce cough frequency - simple behavioral modification can be effective 2