Treatment of Acute Cough

1. Identify and treat the underlying cause

• Most acute cough does not need ancillary testing. Get a chest x-ray if there is purulent sputum, fever, or exam findings suggesting pneumonia; consider spirometry if airflow obstruction is suspected - Tintinalli's Emergency Medicine, p. 470.
• Bacterial sinusitis, pertussis, or pneumonia get disease-specific antibiotics; most URI-related cough is viral and self-limited (can last up to 3 weeks even after resolution of infection) - Tintinalli's Emergency Medicine, p. 470.
• If bronchospasm/wheeze is present (acute bronchitis with airway hyperreactivity), inhaled bronchodilators help.

2. Symptomatic/antitussive therapy

• Dextromethorphan: non-narcotic, centrally acting cough suppressant; comparable efficacy to codeine for acute/chronic cough - Katzung's Basic and Clinical Pharmacology, p. relevant; Murray & Nadel's Respiratory Medicine.
• Codeine: classically used but evidence for benefit over placebo in acute URI-related cough is weak/lacking - Murray & Nadel's Textbook of Respiratory Medicine.
• Guaifenesin (expectorant): may have mild antitussive/mucokinetic effect in acute viral cough, though evidence is limited and inconsistent - Fishman's Pulmonary Diseases and Disorders.
• Demulcents (lozenges, honey-based syrups): soothe the pharynx and modestly blunt the cough reflex.
• Herbal/OTC agents: menthol and pungent spices (pepper, mustard, garlic, onion) have mild antitussive activity.
• Naproxen (NSAID): shown to reduce cough frequency specifically in acute bronchitis.
• Honey: reasonable first-line option in children >1 year with acute cough (avoid in infants <12 months due to botulism risk), supported by pediatric systematic review evidence.
• For intractable cough paroxysms in the ED, nebulized preservative-free lidocaine (1-2%, 4 mL = 40-80 mg) can transiently suppress the cough/gag reflex via posterior pharyngeal anesthesia - Tintinalli's Emergency Medicine, p. 470.

3. General supportive measures

• Hydration, humidified air, rest.
• Avoid/limit smoking and other airway irritants.
• Reassurance that acute cough from viral URI commonly persists 1-3 weeks even as other symptoms resolve.

Points to individualize

• Children: honey (age >1 yr) and simple demulcents preferred over codeine/dextromethorphan, which are discouraged or unlicensed in young children due to safety concerns - consistent with the pediatric systematic review (Marseglia et al., 2021, PMID 33641306).
• Suspected pertussis: cough can last 1-6 weeks; consider macrolide therapy if within the catarrhal/early paroxysmal stage and for household prophylaxis.
• ACE inhibitor cough or postnasal drip/asthma/GERD-driven cough that has become subacute/chronic needs cause-directed therapy (antihistamine-decongestant, inhaled steroid/bronchodilator, or PPI) rather than antitussives alone.

When IV/IM hydrocortisone actually IS appropriate for a coughing patient

• Acute asthma exacerbation / bronchospasm with cough, wheeze, dyspnea - systemic steroids are indicated when lung function is reduced or there's no response to nebulized β2-agonists - Goodman & Gilman's Pharmacological Basis of Therapeutics.
• Anaphylaxis or severe allergic reaction causing cough/airway swelling - hydrocortisone 250-500 mg IV (or methylprednisolone 80-125 mg IV) is used as adjunct therapy, after epinephrine - Tintinalli's Emergency Medicine, Table 14-4.
• Refractory bronchospasm/shock in a critical care setting - 0.25-1 g IV hydrocortisone has been used - Barash, Cullen & Stoelting's Clinical Anesthesia.
• Croup/laryngotracheobronchitis with stridor - though dexamethasone, not hydrocortisone, is the standard steroid choice here.

What to check before giving it

• Is there wheeze, stridor, significant dyspnea, or signs of an allergic reaction/anaphylaxis? If yes, steroid injection can be justified as part of that specific treatment (plus bronchodilator/epinephrine as needed).
• If it's just cough from a cold/acute bronchitis with no bronchospasm or allergic component, hydrocortisone injection is not indicated - stick to antitussives (dextromethorphan, honey, demulcents), hydration, and treating the specific cause.

First, assess severity (don't skip this)

Management (order matters)

1. Oxygen to keep SpO2 ≥94%.
2. Nebulized SABA (salbutamol) - first-line bronchodilator, can repeat/give back-to-back in severe cases. Add nebulized ipratropium bromide for moderate-severe exacerbations (synergistic, though less effective alone than SABA) - Fishman's Pulmonary Diseases and Disorders; Goodman & Gilman's Pharmacology.
3. Systemic corticosteroid - yes, indicated here:
   • Inj hydrocortisone 100-200 mg IV (adult) is a reasonable choice, especially if the patient can't take oral, is vomiting, or is moderate-severe.
   • Equally, oral prednisolone 40-50 mg works just as well if the patient can swallow - oral and IV steroid have comparable onset/efficacy in most guideline evidence; IV is preferred only when oral isn't feasible or in impending respiratory arrest.
   • Pediatric hydrocortisone dose: ~4 mg/kg IV.
4. If severe and not responding to initial bronchodilators: consider IV or nebulized magnesium sulfate (benefit shown in FEV1 <30% or non-responders) - Goodman & Gilman's Pharmacology.
5. Look for a trigger/cause: fever/purulent sputum (infection), known asthmatic with poor control, allergen/drug exposure (consider anaphylaxis if urticaria/angioedema/hypotension present - then epinephrine IM first, steroid as adjunct).

Direct answer to "can I give inj hydrocortisone"

Step 1: Confirm you've actually maximized first-line therapy

• Back-to-back/continuous nebulized salbutamol (not just single dose) - repeat every 15-20 min or give continuously in severe cases.
• Add nebulized ipratropium bromide if not already combined with salbutamol - synergistic bronchodilation - Fishman's Pulmonary Diseases and Disorders.
• Confirm systemic corticosteroid has been given (IV hydrocortisone/oral prednisolone) - it won't act in minutes, but it must be on board.
• Confirm adequate oxygenation (SpO2 ≥94%).

Step 2: If still not responding - add these

1. IV Magnesium sulfate - 2 g IV over 20 minutes in adults (25-50 mg/kg in children, max 2g) - good evidence as adjunct bronchodilator in severe exacerbations (FEV1/PEF <25-30% predicted or non-responders) - Goodman & Gilman's Pharmacology; supported by recent pediatric meta-analyses (PMID 38395640, PMID 40562459).
2. Parenteral beta-agonist:
   • Terbutaline SC/IV, or
   • Epinephrine 0.3-0.5 mg IM/SC (adult) - used as an adjunct in status asthmaticus, especially if there's an anaphylactic/allergic component - Tintinalli's Emergency Medicine.
3. IV Aminophylline - second-line, narrow therapeutic index (needs levels monitored), modest added benefit; still used in some refractory status asthmaticus cases - Goldman-Cecil Medicine.

Step 3: If patient is deteriorating (exhaustion, silent chest, confusion, rising CO2)

• Ketamine - has direct bronchodilator/smooth-muscle relaxant properties; useful both as adjunct and as an induction agent if intubation becomes necessary - Tintinalli's Emergency Medicine; Miller's Anesthesia.
• Consider NIV (BiPAP) as a trial in severe exacerbation not responding to medical therapy, with close monitoring and a low threshold to intubate if no improvement.
• Escalate to ICU - impending respiratory failure needs senior/critical care involvement, don't wait.

Step 4: Reconsider the diagnosis

• Foreign body aspiration (especially if unilateral or sudden onset)
• Cardiac (pulmonary edema causing "cardiac asthma" wheeze) - check for signs of heart failure
• Anaphylaxis with laryngeal edema - check for urticaria, angioedema, hypotension
• Pneumothorax
• Mucus plugging / airway obstruction needing suction
• Vocal cord dysfunction (paradoxical vocal fold motion) mimicking asthma