Stop Antibiotics – This is Likely Postinfectious Cough
You should discontinue further antibiotics, as this persistent cough with green sputum after completing treatment for bronchitis is most likely postinfectious cough, and antibiotics have no role in its management. 1, 2, 1, 2, 1
Understanding Your Situation
After completing Augmentin and prednisone for bronchitis, you're experiencing what's called postinfectious cough – defined as cough lasting 3-8 weeks following an acute respiratory infection. The green sputum does not indicate bacterial infection requiring antibiotics; sputum color is unreliable for distinguishing viral from bacterial causes 3, 4.
Why No More Antibiotics?
The ACCP guidelines are explicit: "Therapy with antibiotics has no role, as the cause is not bacterial infection" 1, 2, 1, 2, 1. This is based on expert consensus and clinical evidence showing postinfectious cough results from:
- Postviral airway inflammation
- Bronchial hyperresponsiveness
- Mucus hypersecretion
- Impaired mucociliary clearance
These are inflammatory processes, not active bacterial infections.
Recommended Treatment Approach
First-Line: Inhaled Ipratropium
Start with inhaled ipratropium bromide – this has fair evidence (Grade B) for attenuating postinfectious cough 1, 2, 1, 2, 1. This anticholinergic bronchodilator helps reduce mucus production and cough reflex.
Second-Line: Inhaled Corticosteroids
If ipratropium doesn't help and the cough significantly affects your quality of life, consider inhaled corticosteroids (Grade E/B) 1, 2, 1, 2, 1. You've already completed oral prednisone, but inhaled steroids provide targeted anti-inflammatory effects with fewer systemic side effects.
Third-Line: Oral Prednisone (Short Course)
For severe paroxysms only, consider another short course of prednisone 30-40 mg daily for 2-3 weeks, tapering to zero 1. However, this should only be done after ruling out:
- Upper airway cough syndrome (postnasal drip)
- Asthma
- Gastroesophageal reflux disease
Last Resort: Antitussives
If other measures fail, consider codeine or dextromethorphan (Grade E/B) 1, 2, 1, 2, 1.
Important Caveats and Red Flags
When to Investigate Further
If cough persists beyond 8 weeks, this is no longer postinfectious cough – consider other diagnoses 1, 2, 1:
- Chronic bronchitis (especially if you smoke)
- Asthma or cough-variant asthma
- Gastroesophageal reflux
- Bronchiectasis
- Pertussis (whooping cough)
Consider Pertussis If:
- Cough has paroxysms (sudden, violent episodes)
- Post-tussive vomiting
- Inspiratory "whoop" sound
- Cough lasting >2 weeks without other cause
If pertussis is suspected, you DO need antibiotics (macrolide like azithromycin) to reduce transmission, plus isolation for 5 days 1, 2, 1.
Protracted Bacterial Bronchitis (Pediatric Consideration)
While the 2017 CHEST guidelines address children specifically 5, if you were a child with chronic wet cough, 2-4 weeks of antibiotics targeting Haemophilus influenzae, Streptococcus pneumoniae, and Moraxella catarrhalis would be appropriate. However, as an adult with postinfectious cough following completed treatment, this doesn't apply.
Common Pitfalls to Avoid
Don't assume green sputum = bacterial infection – this is a persistent myth that drives unnecessary antibiotic use 3, 4
Don't restart antibiotics without clear indication – studies show antibiotics reduce cough duration by only ~0.5 days in acute bronchitis, with no benefit at follow-up 4, 6
Don't ignore symptom duration – track when your cough started relative to the initial infection; this determines whether it's still postinfectious or something else
Don't forget smoking cessation – if you smoke, this is the single most important intervention 7
Expected Timeline
Postinfectious cough typically resolves within 3-8 weeks from the initial infection. If you're within this window, the cough should gradually improve with supportive care and the treatments outlined above. Patience is often the most important "treatment" as this is fundamentally a self-limited condition.