Should I Be on GLP-1 Medication Before My Bariatric Procedure?

GLP-1 therapy use before and after surgery results in lower surgical risk and better post-bariatric surgery outcomes.

GLP-1 medications are a remarkable breakthrough that has taken the United States by storm. So much productivity and life is curtailed by obesity that it’s high time we have an option that is relatively easy to take and maintain.

But for patients with a higher body mass index (BMI), GLP-1 receptor agonists (GLP-1 RAs) are not a one-to-one replacement for more invasive interventions like bariatric surgery. In a study of patients with a very high BMI (greater than 50), researchers found that GLP‑1 RA use before bariatric surgery was associated with significantly greater pre‑surgery weight loss compared with controls and, importantly, a decrease in pre-operative complications.^1-2
In this light, GLP-1 RAs can be an excellent adjunctive therapy.

GLP-1 RAs Before Bariatric Surgery

It might seem counterintuitive, but losing some weight before bariatric surgery can be hugely beneficial, and GLP-1 meds are often the catalyst for that change. Because of the benefits, use of GLP‑1 medications before bariatric surgery has surged dramatically in recent years, rising from under 2% of patients in 2020 to nearly 30% by late 2024.³

When you take GLP-1 medications before bariatric surgery, you can lose up to 20% of your body weight. For most, this is not enough to get down to their goal weight or to eliminate the diseases associated with morbid obesity, but it can jumpstart the process and significantly reduce the risk of any surgical procedure. How?

First, losing even 10% of your body weight can significantly reduce the associated risks of anesthesia. In fact, one of the biggest concerns for patients with morbid obesity is how their bodies will react to sedation. While we test for pulmonary and cardiovascular problems that could complicate surgery, losing additional weight and reducing inflammation – as GLP-1 RAs allow patients to do – can be a game-changer in the risk department.

Second, for patients who have mobility issues due to their obesity, there is necessarily an increase of complications after surgery. Losing some weight before a bariatric procedure almost always means the patient will have improved mobility afterward. This is very important, especially in the first few weeks, when the risk of infection or blood clots is highest. The best way to reduce those risks is to get up and about, walk around, and move. When getting up to do these things feels better, you’re more likely to engage consistently and make movement a regular part of your day.

Lastly, the psychological impact of losing weight can’t be overstated. When patients begin to lose weight, even if it’s in small increments, they tend to be more determined and enthusiastic in the weeks and months after their surgery – that initial weight loss can ignite motivation and progress.

One consideration, which is extremely important for any surgery and to be discussed during your consultation, is that GLP-1 RAs must be discontinued at least 2 weeks before the procedure. This is because GLP-1 therapy slows the passage of food through the gastrointestinal system. This phenomenon, known as gastroparesis, delays gastric emptying and can lead to aspiration during the operation.

GLP-1 RAs After Bariatric Surgery

The use of GLP-1 drugs post-op can be an effective way to help patients reach their goal weight. Most patients will lose the vast majority of their weight in the first year and a half after their surgical procedure. But there tend to be plateaus during that time, and especially after that 18-month mark. While we have proven ways to bust through those weight loss slowdowns, adding a GLP-1 medication to the mix often gives us a leg up.

After 2 to 3 years following a gastric sleeve procedure, some patients begin to experience increased hunger pangs due to ghrelin (the “hunger” hormone) being produced in the stomach again, albeit in lower amounts. This is perfectly normal, but GLP-1 RAs can help patients curb cravings and continue their weight-loss journey.

Similarly, suppose someone struggles to maintain their weight loss over the long term, whether it’s due to behavioral health patterns, an inability to achieve better nutritional habits, or exercise inconsistency. Rather than opting for a revisional bariatric surgical procedure, many can try GLP-1 meds to get them back on track.

Remember that the gastric pouch after a sleeve tends not to stretch, and as such, weight regain is rarely due to a mechanical failure of the procedure. Instead, it is typically a liberalization of diet and exercise protocols and habits that can be curbed with GLP-1 therapy. Still, a concerted effort to change and build better lifestyle choices, alongside treatments like GLP-1 RAs, pays off with lasting health improvements, healthier habits, and a stronger sense of well-being.

GLP-1 therapy is not a replacement for bariatric surgery, but it can be an excellent complement to it, both before and after. If you’ve struggled with obesity, are thinking about or have tried GLP-1 RAs, and want to explore more options, talk to the team at Advanced Bariatric and Surgical Specialists. Our top priority is your well-being, and we’re committed to guiding our patients through every part of the weight loss journey. We only suggest treatments that truly serve your health and goals.

1. Ilanga, M., Heard, J. C., McClintic, J., Lewis, D., Martin, G., Horn, C., Khorgami, Z., Richards, J., Chow, G. S., & Lim, R. B. (2023). Use of GLP-1 agonists in high risk patients prior to bariatric surgery: a cohort study. Surgical endoscopy, 37(12), 9509–9513. https://doi.org/10.1007/s00464-023-10387-1.
2. Pre-operative use Of GLP-1s May Reduce Complications After Metabolic and Bariatric Surgery in Patients with Extreme Obesity. (2024, June 13). American Society for Metabolic and Bariatric Surgery. https://asmbs.org/news_releases/pre-operative-use-of-glp-1s-may-reduce-complications-after-metabolic-and-bariatric-surgery-in-patients-with-extreme-obesity/.
3. American College of Surgeons | Clinical Congress Scientific Forum. (2025, October 3). Use of Weight Loss Drugs Before Bariatric Surgery Has Soared in Recent Years, Study Finds. ACS. https://www.facs.org/media-center/press-releases/2025/use-of-weight-loss-drugs-before-bariatric-surgery-has-soared-in-recent-years-study-finds/.