Semaglutide Long-Term Safety: What We Know So Far

When starting a new medication, it’s normal to have some questions, including how long you might need to take it. When it comes to semaglutide, a popular medication class that is indicated for uses for weight management, type 2 diabetes, and reducing the risk of major cardiovascular disease, this is especially tricky to define.

Some people take semaglutide for a set amount of time. Others use it in a long-term management plan.

For those who may benefit from using a medication in this class for months or years, it’s important to know the benefits and possible safety considerations of long-term semaglutide use.

Ahead is a comprehensive guide to what we currently know about semaglutide's long-term safety.

Why Long-Term Use Comes Up With Semaglutide

Semaglutide is a medication that mimics GLP-1, a naturally occurring hormone that activates receptors in the brain, pancreas, heart, and kidneys. When these receptors are triggered, either by a medication or a natural hormone, they do a few key things:

• Help with blood sugar regulation
• Slow gastric emptying, which makes someone feel full for longer
• Reduce hunger cues

Based on these established effects, there are three FDA-approved drugs in this medication class. Each is approved for different conditions.

Medication	Weight management	Blood sugar regulation	Reduce risk of major cardiovascular events	Other FDA-approved purposes
Ozempic	Not approved	In adults with type 2 diabetes	In adults with type 2 diabetes and a higher risk level	N/A
Wegovy	Approved for adults and kids over 12 who meet certain criteria	Not approved	Not approved	Treatment of noncirrhotic metabolic dysfunction-associated steatohepatitis (MASH)
Rybelsus	Not approved	In adults with type 2 diabetes	Not approved	N/A

Heart health, managing type 2 diabetes, and addressing obesity or excess weight are all ongoing tasks. They’re not the same as a virus or injury that can heal one time and be gone for good. Because semaglutide is approved for ongoing health concerns, some people use these medications for months or years too.

What Clinical Studies Can Tell Us

Semaglutide safety data generally supports the long-term use of semaglutide when prescribed for an ongoing health concern. A 2022 review of the literature, for example, concluded that a 2.4mg dose prescribed for weight management was safe to take for up to two years.

Data from large clinical trials also indicate long-term use may be effective and safe when medically necessary.

The SELECT Trial

• Participant profile: 17,604 participants who were all over 45, had a body-mass index (BMI) of 27 or above, and did not have diabetes. 8,803 received semaglutide; 8,801 got a placebo.
• What was studied: The incidence of major adverse cardiovascular events
• How long participants took semaglutide: About 40 months
• Outcome: Semaglutide reduced the risk of adverse cardiovascular events by 20%, plus weight loss continued for 65 weeks. Some participants sustained weight management effects for up to four years.

The STEP Trial

• Participant profile: 1,961 participants with a BMI at or above 30 who did not have diabetes. Two-thirds of participants experienced a lifestyle intervention and took semaglutide; the other third received the same lifestyle intervention with a placebo.
• What was studied: Mean change in body weight
• How long participants took semaglutide: 68 weeks
• Outcome: The semaglutide group had a mean change in body weight of -15.3 kilograms (33.73 pounds), compared to -2.6 kilograms (5.73 pounds) in the placebo group over the 68 weeks.

The PIONEER 7 Trial

• Participant profile: 184 participants received injectable semaglutide, 100 received oral semaglutide, and 98 received sitagliptin, a different medication for type 2 diabetes.
• What was studied: Reduction in body weight and blood sugar control
• How long participants took semaglutide: The original trial was 52 weeks, with a two-year extension phase
• Outcome: The semaglutide group experienced a larger reduction in body weight and improved blood sugar control; participants sustained these effects during the trial’s extension phase.

Known Safety Topics to Monitor

Even with promising long-term outcomes in clinical trials, semaglutide has side effects and risks. The following are some known safety considerations that a prescribing healthcare provider will monitor for in patients taking semaglutide.

Gastrointestinal Side Effects

The most commonly reported side effects of semaglutide are gastrointestinal. These include:

• Nausea
• Vomiting
• Diarrhea
• Constipation
• Abdominal cramps

These effects are transient for many trial participants, and research suggests they may reduce in intensity or disappear as someone’s body adjusts to semaglutide.

Semaglutide may also cause gastroparesis, a condition where the movement of food from the stomach to the small intestine is slowed or stopped. This may lead to many of the same reported side effects as above, but may also come with complications like dehydration or malnutrition if left untreated.

Gallbladder Issues

The gallbladder, a pear-shaped organ underneath the liver, stores bile that helps the liver digest fat. A small number of semaglutide trial participants have experienced acute gallbladder disease.

This risk is more likely to happen in the first 90 days, though a healthcare provider should monitor for any signs of gallbladder issues the entire time someone takes semaglutide.

Pancreatitis Warning

Semaglutide may increase the risk of acute pancreatitis, which is short-term inflammation in the pancreas. A lot of the evidence supporting this risk comes from case reports, when a doctor writes about a specific patient’s experience, not large-scale clinical trials.

Kidney Concerns

Due to semaglutide’s digestive side effects, some people have developed impaired kidney function. These effects tend to be acute, or short-term, and the evidence doesn’t suggest a connection between GLP-1 use and chronic kidney disease.

In fact, the FLOW clinical trial data suggests semaglutide may reduce the risk of some adverse kidney outcomes in people with chronic kidney disease and/or type 2 diabetes, though more evidence is required to support this possible benefit.

Thyroid C-Cell Tumor Warning

All FDA-approved GLP-1 drugs come with a boxed warning for thyroid c-cell tumors. These tumors, which are linked to a rare type of thyroid cancer called medullary thyroid carcinoma, have been found in animal studies.

As such, the FDA warns that Ozempic, Rybelsus, and Wegovy should not be used by those with a family history of medullary thyroid carcinoma or a personal history of Multiple Endocrine Neoplasia syndrome type 2 (MEN 2).

Weight Loss, Muscle, and Nutrition Over Time

Semaglutide has helped many people lose weight. The issue, however, is that the drug doesn’t discriminate by the type of weight lost (fat or muscle). While losing excess fat is beneficial to overall health, losing muscle is not. When someone has less muscle mass, they may experience various health effects.

To understand why muscle matters, let’s look at a few of the many ways muscle supports overall health:

• Helps you breathe
• Allows you to stand, sit, and move
• Aids with digestion
• Supports metabolism, how fast food is turned into usable energy
• Maintains blood circulation

In some studies, 25-40% of total weight loss was lean muscle. The good news is this muscle loss isn’t inevitable. Semalgutide plus diet modification and exercise that builds muscle has been shown to preserve muscle mass.

And if you’re wondering how to integrate muscle-building lifestyle changes into your routine, here are a few tips to get started:

• Strength train: Studies suggest anywhere between two to four strength training sessions a week (each lasting 30 minutes to an hour) can help with muscle growth.
• Progressive overload: Muscle growth is often more effective when someone practices progressive overload, which is when you increase the weight used or the number of reps over time in order to continuously challenge the body.
• High protein diet: The body uses protein to build lean muscle. Even though GLP-1 medications may suppress appetite, it’s still important to get the recommended daily protein intake (which varies from person to person).

What Happens if Treatment Stops?

When someone stops taking semaglutide, the body gradually loses the drug’s influence on blood sugar, appetite, and digestion.

Here’s what stopping this medication may look like in the short- and long-term:

• Immediately after stopping: Right after discontinuing semaglutide, someone may feel hungrier faster after eating and have more food cravings and hunger cues than before.
• Long-term weight regain: In a landmark study, participants regained two-thirds of the weight lost within one year of stopping semaglutide.
• Gradual impact on blood sugar: Blood sugar regulation effects may last after stopping this medication. One study suggests participants who took semaglutide for 68 weeks experienced improved blood sugar control after discontinuing the medication. Still, this isn't a guarantee, and it is possible for blood sugar levels to return to where they were before taking semaglutide.

Despite these effects, it is possible to stop semaglutide without weight regain or a negative impact on blood sugar. To s

afely discontinue this medication, do so under the guidance of a healthcare provider and maintain (or start) the healthy lifestyle practices that are recommended alongside semaglutide use. These include eating a nutritious diet, exercising regularly, and getting enough sleep.

Questions to Review at Follow-Up Appointments

To help manage any side effects and make sure semaglutide is working as intended, patients should have regular check-ins with their prescribing healthcare provider. These check-ins typically occur every few weeks when starting the medication, and then become less regular if someone requires a long-term maintenance dose.

During follow-up appointments, ask the prescribing healthcare provider:

• Are we making good progress with this medication?
• Are there any warnings or indications that I should stop this medication?
• What lifestyle adjustments can I make to better support the effects of this medication?
• Is there anything else I should know or consider moving forward?

Bottom Line

Semaglutide has a growing body of clinical evidence behind it, and for many people managing weight, type 2 diabetes, or cardiovascular risk, the long-term benefits can outweigh the risks. Large trials like SELECT, STEP, and PIONEER 7 suggest that with proper medical oversight, semaglutide can be used safely over months or even years.

That said, long-term use comes with real considerations. Gastrointestinal side effects, gallbladder health, and muscle loss are worth monitoring and actively managing. Many of these concerns can be addressed through the lifestyle habits already recommended alongside this medication: strength training, a high-protein diet, and regular movement.

Whether someone takes semaglutide short-term or as part of a long-term plan, staying consistent with follow-up appointments, asking the right questions, and building sustainable habits are what turn a prescription into a plan.