Omeprazole use in chronic cough
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Omeprazole and Chronic Cough: Dual Roles in Treatment and Adverse Effects
Omeprazole for Gastroesophageal Reflux-Related Chronic Cough
Omeprazole, a proton pump inhibitor (PPI), is commonly used to treat chronic cough associated with gastroesophageal reflux disease (GERD). Several studies have shown that omeprazole can significantly improve or resolve chronic cough in patients with GERD after other common causes like asthma and postnasal drip are excluded. In controlled trials, omeprazole led to notable reductions in cough frequency and severity, with effects sometimes continuing even after treatment stopped Kiljander2000Ours1999Xu2016+2 MORE. High-dose omeprazole was effective in about a quarter to a third of patients with refractory reflux-induced chronic cough, and stepwise protocols that escalate therapy can further increase response rates . In patients with idiopathic pulmonary fibrosis, omeprazole also showed a trend toward reducing cough frequency, though larger studies are needed .
Omeprazole-Induced Chronic Cough: A Rare but Important Adverse Effect
While omeprazole is often prescribed to treat chronic cough due to GERD, there are documented cases where omeprazole itself has caused persistent, dry, non-productive cough. In these cases, the cough began after starting omeprazole and resolved after discontinuing the drug, suggesting a probable causal relationship Howaizi2003Dingal2023Reiche2010+1 MORE. The mechanism behind this adverse effect is unclear, and it is considered rare, but clinicians should be aware of this possibility, especially when no other cause for chronic cough is found and the cough coincides with omeprazole use Howaizi2003Dingal2023Reiche2010+1 MORE.
Diagnostic and Therapeutic Considerations for Chronic Cough and Omeprazole
For patients with chronic cough of unknown origin, guidelines suggest first excluding common causes such as asthma and postnasal drip. If GERD is suspected, an empiric trial of high-dose omeprazole for a short period (e.g., two weeks) is recommended, as esophageal testing does not always reliably identify those who will respond to PPI therapy Ours1999Kwon2005. If cough improves with omeprazole, GERD is likely the cause. However, if cough develops or worsens after starting omeprazole, clinicians should consider the possibility of a drug-induced cough and discontinue the medication to see if symptoms resolve Howaizi2003Dingal2023Reiche2010+1 MORE.
Conclusion
Omeprazole plays a dual role in chronic cough: it is an effective treatment for GERD-related cough in many patients, but it can also rarely cause chronic cough as an adverse effect. Clinicians should balance these possibilities, monitor patients closely, and consider both the therapeutic benefits and potential risks when prescribing omeprazole for chronic cough.
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