Semaglutide for After Bariatric Surgery: Evidence

Semaglutide is not FDA approved for weight regain after bariatric surgery. It is approved for type 2 diabetes, heart risk and kidney disease in type 2 diabetes. Some doctors prescribe it when one of those uses also applies. In STEP 1, people on Wegovy lost 14.9% of body weight on average, vs 2.4% on placebo.

Brands: Ozempic, Wegovy and Rybelsus
Best result (STEP 1): 14.9% weight loss

Wegovy: key facts

How long it remains in the body

Its half-life is about 1 week: after 7 d, half is gone, and about 3% remains after five half-lives (35 d).

Weight loss in its main trial

In STEP 1, the result after 68 weeks was 14.9% of body weight, compared with 2.4% on placebo.

Cost over time

Monthly prices in US dollars include the list price and self-pay offers, each taken from the maker's price page.

Sources: FDA label (DailyMed), healthsystemtracker.org, prnewswire.com 1 2.

Who qualifies?

Semaglutide: who qualifies
Who sets the rule	Who qualifies
Ozempic	When used with diet and exercise, it lowers blood sugar for adults who have type 2 diabetes.
Ozempic	Adults who have type 2 diabetes plus heart disease and take this medicine are less likely to have a heart attack, stroke, or heart-related death.
Ozempic	Adults who have type 2 diabetes and chronic kidney disease have a lower risk of kidney disease getting worse, kidney failure and heart-related death when taking it.
Wegovy	If an adult has heart disease plus obesity or overweight, this medicine lowers the chance of stroke, heart attack, or death linked to the heart (injection and tablets).
Wegovy	You can use it with diet and activity to lose weight and keep it off over the long term. It is for adults and children 12 and older who have obesity. It is also for adults with overweight when they also have a weight-related condition.
Wegovy	For MASH with moderate to advanced scarring and no cirrhosis, adults can use it to treat liver disease (injection).
Wegovy	The tablet form is approved for adults for weight loss and lowering heart risk.
Rybelsus	When used with diet and exercise, it lowers blood sugar for adults who have type 2 diabetes.
Rybelsus	Adults at high risk who have type 2 diabetes see a lower chance of a heart-related death, heart attack or stroke with this medicine.
Medicare GLP-1 Bridge	BMI 35 or higher, no condition needed
Medicare GLP-1 Bridge	Heart failure, uncontrolled blood pressure, or CKD 3a+, with BMI 30 or higher
Medicare GLP-1 Bridge	PAD, prediabetes, or a prior heart attack or stroke, with BMI 27 or higher
Typical commercial plan (Aetna policy)	BMI 30 or higher
Typical commercial plan (Aetna policy)	BMI 27 or higher with a weight-related condition
Typical commercial plan (Aetna policy)	a program of diet and activity lasting 6 months comes first

Sources: medicare.gov 1 2; aetna.com; FDA label (DailyMed), see 1 2 3.

Trial results after bariatric surgery

None of these studies included only people who regained weight after bariatric surgery. The participants were adults with obesity or overweight and did not have diabetes.

Semaglutide trials for weight regain after bariatric surgery
Trial	Medicine	Who took part	Length	People	Main result	Comparison
STEP 1	Wegovy	Adults with obesity or overweight, without diabetes	68 weeks	1,961	14.9% weight loss	2.4% on placebo
OASIS 4	Wegovy	Adults with obesity or overweight, without diabetes	64 weeks	307	13.6% weight loss	2.4% on placebo

Source for the trial: STEP 1 (FDA label (DailyMed)).

After bariatric surgery, what changes?

Semaglutide label information about weight regain after bariatric surgery
What changes	What the label says	Labels
Acute Kidney Injury Due to Volume Depletion	Vomiting or diarrhea can cause fluid loss, which may lead to kidney injury. Drink fluids and report heavy fluid loss.	All of them
Severe Gastrointestinal Adverse Reactions	Stomach and gut side effects happen often and may be severe. Not recommended for people with severe gastroparesis.	All of them
Acute Gallbladder Disease	Gallstones and gallbladder inflammation can happen. Tell them about any pain in your upper right belly, any fever, or yellow skin or eyes.	All of them
Taken with oral medicines	It slows stomach emptying, and this may affect how other pills are absorbed.	All of them

FDA labels on DailyMed: FDA label (DailyMed).

The label warnings come from the FDA label on DailyMed.

What coverage looks like after bariatric surgery

Medicare Part D does not pay for a GLP-1 used only for weight loss.

Under Medicare GLP-1 Bridge rules, Wegovy is listed at $50 per month for anyone who qualifies.

When Medicaid covers weight-loss GLP-1s, prior authorization is standard.

Sources: humana.com, CMS, KFF.

Other choices after bariatric surgery

A look at weight regain after bariatric surgery and GLP-1 medicines
Medicine	For life after bariatric surgery	How it is taken	Trial result
Ozempic	Not a listed use	weekly injection	Not listed
Wegovy	Not a listed use	weekly injection or daily tablet	14.9% weight loss
Rybelsus	Not a listed use	daily tablet	Not listed
Mounjaro	Not a listed use	weekly injection	Not listed
Zepbound	Not a listed use	weekly injection	20.9% weight loss
Foundayo	Not a listed use	daily tablet	11.1% weight loss
Trulicity	Not a listed use	weekly injection	Not listed
Saxenda	Not a listed use	daily injection	7.4% weight loss
Victoza	Not a listed use	daily injection	Not listed
Byetta	Not a listed use	twice-daily injection	Not listed