No, PPIs do not cause cough—they are used to treat reflux-related cough
Proton pump inhibitors (PPIs) are a treatment for gastroesophageal reflux-induced chronic cough, not a cause of it. The evidence overwhelmingly supports PPIs as therapeutic agents for reflux-related cough, though one isolated case report exists suggesting omeprazole-induced cough.
The Evidence Against PPI-Induced Cough
The provided evidence focuses entirely on ACE inhibitor-induced cough, which is a well-established class effect occurring in 5-35% of patients 1. This is mechanistically distinct from any theoretical PPI effect, involving bradykinin and substance P accumulation when ACE is inhibited 1.
The Single Contrary Case
Only one case report from 2010 describes omeprazole-associated cough in a GERD patient with elevated plasma omeprazole levels 2. This represents:
- A single patient observation
- No established mechanism
- No reproducibility across populations
- Likely a coincidental finding or idiosyncratic reaction
This isolated case report cannot establish causation and should not change clinical practice.
PPIs as Treatment for Reflux-Related Cough
Recent evidence demonstrates PPIs are therapeutic for reflux-induced cough:
- Up to 75% of patients with reflux-related cough lack classic heartburn symptoms, making diagnosis challenging 3
- Stepwise management begins with lifestyle modifications and PPI therapy as first-line treatment 3
- For severe chronic cough with laryngopharyngeal reflux, combined anti-reflux diet, PPIs, and alginates are effective in 81.8% of cases 4
- Some patients are PPI-refractory, but this reflects inadequate reflux control or non-acidic reflux—not PPI toxicity 5
Clinical Algorithm
When evaluating chronic cough:
- Consider reflux as a cause even without heartburn (75% lack classic symptoms)
- Initiate empiric PPI therapy with lifestyle modifications as first-line treatment
- Assess response after 8-12 weeks (not the 1-4 weeks needed for ACE inhibitor cough resolution)
- For PPI-refractory cases, consider impedance-pH testing to identify non-acidic reflux 6, 5
- Add alginates and neuromodulators for persistent symptoms despite adequate acid suppression
Common Pitfall
Do not confuse ACE inhibitor-induced cough with reflux-related cough. ACE inhibitor cough:
- Is dry with throat tickling 1
- Occurs in 5-35% of patients 1
- Resolves 1-4 weeks (up to 3 months) after stopping the ACE inhibitor 1
- Is more common in women, nonsmokers, and Chinese populations 1
If a patient on both an ACE inhibitor and PPI develops cough, discontinue the ACE inhibitor first 1.