Discontinuation and Reduction of Asthma Medications After Metabolic and Bariatric Surgery: A Systematic Review and Meta-Analysis

• Asthma affects about 25 million Americans, and obesity makes it significantly worse. This review found bariatric surgery can improve asthma so much that many patients stop or reduce their asthma medications.
• The meta-analysis pooled results from multiple studies, the strongest form of medical evidence, finding consistent improvements in asthma control.
• Reducing or eliminating asthma medications after surgery represents both quality-of-life improvement and significant cost savings.
• Excess body fat produces inflammatory chemicals that worsen airway inflammation, and abdominal obesity physically restricts the lungs; bariatric surgery addresses both problems.
• Published in Obesity Reviews, one of the most respected journals in obesity research, representing the highest level of medical evidence.
• For patients with both obesity and asthma, this research shows bariatric surgery can address both conditions simultaneously.

Why This Study Was Needed

Asthma is more common and harder to control in people with obesity. Extra weight compresses the lungs, and fat tissue drives body-wide inflammation, which can make inhalers and steroids less effective. Individual studies had suggested that asthma improves after bariatric surgery, but no one had pooled the evidence on a practical question patients care about: can I stop or reduce my asthma medications?

How the Study Was Done

This systematic review and meta-analysis, co-authored by Dr. de la Cruz-Muñoz with researchers at UTHealth and UT Southwestern, searched PubMed, Embase and Cochrane. Fifteen studies met the criteria, mostly prospective or retrospective cohorts from the United States, Australia, Canada, Norway and New Zealand, ranging from 12 to more than 13,000 patients. Thirteen studies had enough data to combine statistically.

What the Study Found

• More than half of patients with asthma (54%; 95% CI 42%–67%) were able to stop all asthma medications after surgery.
• In studies reporting medication counts, the number of asthma medications fell by 22% to 46%.
• Results were consistent with earlier meta-analyses showing better lung function and quality of life after surgery.

What This Means for Patients

If you have asthma and obesity, bariatric surgery may allow you to reduce or stop your inhalers and oral steroids. That matters because long-term steroid use itself causes weight gain, bone loss and diabetes. Never stop asthma medication on your own; reductions should be guided by your pulmonologist or primary care physician as your breathing improves. Asthma often travels with sleep apnea, obesity hypoventilation syndrome and reflux (GERD), all of which also tend to improve after surgery. Our guide What Happens to Your Health Conditions After Bariatric Surgery explains what to expect for each condition, and our medication guide covers medication changes after surgery.

Clinical Pearls

• About 54% of patients achieved complete discontinuation of asthma medication after bariatric surgery.
• Medication burden fell by 22% to 46% in studies reporting rate ratios.
• This was the first meta-analysis focused specifically on asthma medication use after surgery.
• Asthma control is a legitimate reason to consider surgery in patients who qualify.

Strengths and Limitations

The review followed PRISMA standards and searched three major databases. Most included studies were observational, definitions of remission varied, heterogeneity between studies was high (I² = 86%), and many older studies involved gastric banding, which is rarely performed today. None directly measured how reducing medication affected quality of life.

Expert Commentary

Asthma is rarely the reason a patient comes to see me, but it is often one of the conditions that improves most dramatically. Patients who have used inhalers every day for years, and needed courses of steroids that made their weight worse, are often able to cut back or stop.

This meta-analysis gives us a number to share: more than half of patients come off asthma medication entirely. That belongs in the conversation when someone is deciding whether surgery is worth it.

— Dr. Nestor de la Cruz-Muñoz

For more on outcomes, see real results after bariatric surgery and check eligibility with Am I a Candidate?.