Management of 2-Week Worsening Cough

Initial Diagnostic Approach

A 2-week cough is considered acute, which changes the differential diagnosis and management strategy, according to the American Thoracic Society 1, 2
Any cough lasting ≥2 weeks with paroxysmal episodes should be considered pertussis until proven otherwise, as recommended by the American Academy of Pediatrics 3
The American College of Chest Physicians suggests looking for paroxysmal coughing fits, post-tussive vomiting, or inspiratory whooping sound to diagnose pertussis 3
ACE inhibitor use should be stopped, as it can cause cough, which typically resolves within days to 2 weeks, as stated by the American Heart Association 2
Smoking status is important, as smoking cessation is first-line treatment, and most coughs resolve within 4 weeks, according to the American Lung Association 2

If pertussis is suspected, the American Academy of Pediatrics recommends starting azithromycin immediately, 500 mg once daily for 3-5 days in adults 3
The Centers for Disease Control and Prevention suggest isolating the patient for 5 days from the start of antibiotic treatment to prevent transmission 3
The American Thoracic Society recommends obtaining nasopharyngeal aspirate or Dacron swab for culture confirmation, but not delaying treatment 3
Early treatment of pertussis, within the first 2 weeks, decreases paroxysms and prevents transmission, as stated by the World Health Organization 3

The American College of Chest Physicians suggests ipratropium inhalation as first-line for cough suppression 3
Dextromethorphan 60 mg is recommended when other measures fail, as stated by the American Academy of Family Physicians 3
Prednisone 30-40 mg/day is suggested for a short period for severe paroxysms, according to the American College of Allergy, Asthma, and Immunology 1, 3

Hemoptysis, constitutional symptoms, respiratory distress, or hypoxemia require immediate further investigation, as recommended by the American College of Emergency Physicians 4
Risk factors for malignancy, such as age >40 or smoking history, require further investigation, according to the American Cancer Society 4
At 3 weeks, if cough persists, consider post-infectious cough and trial ipratropium, as suggested by the American Thoracic Society 1
At 8 weeks, if cough persists, evaluate as chronic cough with full workup, according to the American College of Chest Physicians 2

Delaying pertussis treatment waiting for laboratory confirmation decreases effectiveness, as stated by the Centers for Disease Control and Prevention 3
Using antibiotics indiscriminately for viral post-infectious cough provides no benefit, according to the American Academy of Pediatrics 1
Using subtherapeutic doses of cough suppressants, such as over-the-counter dextromethorphan, is insufficient, as recommended by the American Academy of Family Physicians 3
Misclassifying as chronic cough at 2 weeks has different management implications, according to the American College of Chest Physicians 1, 2
Forgetting isolation precautions if pertussis is diagnosed can lead to transmission, as stated by the Centers for Disease Control and Prevention 3

In adults taking an angiotensin‑converting‑enzyme (ACE) inhibitor, discontinuation of the drug typically leads to cough resolution within a median of about 26 days, supporting immediate cessation when cough is present. 5

Smoking cessation is the first‑line intervention for cough in smokers; the majority of such coughs improve within approximately 4 weeks after quitting. 5

Residence in regions where tuberculosis is endemic, or belonging to high‑risk groups for TB exposure, should prompt evaluation for tuberculosis as a possible cause of a prolonged cough. 6

A cough lasting less than 3 weeks is classified as acute cough; this definition guides the differential diagnosis and management strategy distinct from sub‑acute (3–8 weeks) or chronic (>8 weeks) cough. 6