Long-term effects of Ozempic® and Wegovy®

If you are thinking about years on a shot, the long-term effects of Ozempic® and Wegovy® can feel like a big unknown.

Maybe you have lost weight or steadied your blood sugar. Now you wonder what staying on the medicine really means over time.

Here is the reassuring part. There is real long-term data to lean on, and this guide walks through what it does and does not show.

How long do people take Ozempic® and Wegovy®?

Wegovy® and Ozempic® are both brands of semaglutide, a GLP-1 receptor agonist. They are taken as a once-weekly shot under the skin.

Obesity and type 2 diabetes are long-term conditions. So these medicines are built for steady, ongoing use, not a short course.

Each brand starts at a low dose and steps up slowly. Wegovy® climbs to a 2.4 mg maintenance dose, while Ozempic® can reach up to 2 mg once weekly.

The slow climb gives your body time to adjust. Once you reach a steady dose, many people stay there for the long run.

There is no set finish line on the label. For many, long-term use is like managing any ongoing condition, with steady doses and regular reviews.

What the longest Wegovy® study shows about long-term use

The SELECT study is the longest controlled look at Wegovy® (brand of semaglutide) so far. It followed 17,604 adults for a mean of about 3.3 years.

It tracked major heart-related events, grouped together and called MACE. This is a common way to measure serious heart problems in a study.

In SELECT, 6.5% of people on Wegovy® had one of these events, versus 8.0% on placebo. That points to a hazard ratio of 0.80, about a 20% lower relative risk.

This is the kind of multi-year evidence that shorter trials cannot give. It is why SELECT is the anchor for what we know about long-term Wegovy® use.

SELECT gives a rare, multi-year window into one branded medicine. Most weight and blood-sugar trials run for a year or two at most.

These results apply only to the FDA-approved branded product. They do not transfer to compounded preparations.

Compounded semaglutide is not FDA-approved, is not a generic of Wegovy® or Ozempic®, and is not evaluated by the FDA for safety, effectiveness, or quality.

SELECT followed more than 17,000 adults for about 3.3 years, the longest controlled look at Wegovy® so far.

How weight changes over time on Wegovy®

In the STEP 1 study, Wegovy® (brand of semaglutide) 2.4 mg was tested over 68 weeks. It enrolled 1,961 adults.

People on Wegovy® lost about 14.9% of their body weight, versus 2.4% on placebo. That is the labeled result for weight.

The weight came off step by step across the whole study. It did not all drop at once, and it began to level off near the end.

This gradual pattern is normal. It also means patience matters, since the biggest changes build over many months.

Everyone's curve looks a little different. Some people see faster early loss, while others build results more slowly.

What happens if you stop Wegovy® or Ozempic®

Weight regain after stopping is common, and it is expected. Obesity is a long-term condition, so the medicine manages it rather than curing it.

In a STEP 1 extension study, people stopped Wegovy® at week 68. By week 120, about one year off the drug, they had regained roughly two-thirds of the weight they lost.

Even so, there was a lasting gap. At week 120, those who had taken Wegovy® were still down about 5.6% from baseline, versus 0.1% for placebo.

The label does not define a taper or a lower maintenance dose to prevent regain. So any plan to pause or stop is a conversation for you and your prescriber.

Regain does not erase the work you did. It simply shows that the condition is ongoing, so the plan needs to be ongoing too.

Weight regain after stopping is expected, because obesity is a long-term condition that the medicine manages over time.

Long-term blood sugar results with Ozempic®

Ozempic® (brand of semaglutide) is approved for type 2 diabetes, not weight loss. Its studies focus on blood sugar, measured as A1c.

In the SUSTAIN 1 study, 388 adults were followed for 30 weeks. Ozempic® 0.5 mg lowered A1c about 1.4%, and 1 mg lowered it about 1.6%.

On placebo, A1c fell only about 0.1%. So the medicine drove most of the change in this study.

Blood sugar control that holds over time is the goal for many people with type 2 diabetes. Ozempic® is meant to support that steady, long-term management.

Known long-term effects of Ozempic® and Wegovy® to watch

Some risks are well described on the FDA labels. Knowing them helps you spot trouble early and act.

The most serious is a boxed warning about thyroid C-cell tumors. In animal studies, semaglutide caused these tumors, but it is not known whether it does in people.

Because of this, neither brand is for people with a personal or family history of medullary thyroid cancer (MTC) or MEN 2.

Both labels also warn about acute pancreatitis, a serious problem with the pancreas. Warning signs include severe stomach pain that may spread to your back, with or without vomiting.

If you have pain like that, contact your prescriber or seek care. Do not try to wait it out.

Stomach side effects are the most common by far. In the Wegovy® studies, 44% of people reported nausea, 30% diarrhea, and 24% vomiting.

For Ozempic® at the 1 mg dose, about 20.3% reported nausea and 9.2% vomiting. These effects are often strongest early and may ease with time.

The good news is that most side effects are manageable. Starting low and going slow is designed to keep them gentle.

Ongoing nausea, vomiting, or diarrhea can leave you dehydrated. In rare cases, severe dehydration has been linked to acute kidney injury.

Tell your prescriber right away if stomach symptoms do not go away. Staying ahead of dehydration helps protect your kidneys.

Boxed warning: thyroid C-cell tumors seen in animals; the risk in people is not known.

Acute pancreatitis: severe stomach pain that may spread to the back needs quick care.

Common stomach effects: nausea, diarrhea, vomiting, and constipation, often strongest early on.

Dehydration and, rarely, kidney injury if vomiting or diarrhea will not stop.

What we still do not know about Ozempic® and Wegovy®

Even the best studies have limits. It helps to know where the evidence gaps are.

The longest controlled data on Wegovy® runs to a mean of about 3.3 years, from SELECT. What happens across five, ten, or twenty years is far less certain.

The thyroid signal is another open question. The C-cell tumors were seen in rodents, and whether that risk carries over to people has not been determined.

There is also no label-defined way to taper off and hold your results. Research on stopping, like the STEP 1 extension, shows regain is common but not how to prevent it.

None of this makes the medicines unsafe. It means honest, long-term answers are still being gathered, so regular check-ins with your prescriber matter.

Question	Wegovy® (semaglutide)	Ozempic® (semaglutide)
Longest controlled study	SELECT, mean about 3.3 years, N=17,604	Studied mainly for blood sugar, shorter trials
Main long-term outcome	MACE 6.5% vs 8.0% placebo, HR 0.80 (about 20% lower relative risk)	A1c down about 1.6% at 1 mg (SUSTAIN 1, N=388)
Weight over time	About -14.9% vs -2.4% placebo at 68 weeks (STEP 1, N=1,961)	Not approved for weight loss
Maintenance dose	2.4 mg once weekly	Up to 2 mg once weekly
Boxed warning	Thyroid C-cell tumors (MTC, MEN 2)	Thyroid C-cell tumors (MTC, MEN 2)

Figures come from the FDA prescribing information and the named trials for each brand. These are separate studies, not a head-to-head comparison.

How long-term use tends to unfold

1. Weeks 1 to 16: Wegovy® or Ozempic® starts low and steps up every 4 weeks to ease side effects.

2. Months 1 to 4: stomach effects are often strongest, then many people find they settle.

3. Across the first year: on Wegovy®, weight comes off step by step and starts to level off.

4. Year 1 and beyond: many people stay on a maintenance dose for long-term management.

5. If you stop: weight regain is common, so any change is a talk with your prescriber.

Making long-term use of Ozempic® and Wegovy® easier

Long-term use goes best when the medicine becomes a quiet part of your routine. A few simple habits can help.

Both brands are once-weekly shots. Picking the same day each week makes it easier to remember and keeps your dose steady.

Rotate your injection sites in the abdomen, thigh, or upper arm. This small habit keeps the skin comfortable over months of use.

Keep sipping fluids through the day, especially if your stomach feels off. Staying hydrated helps you avoid the dehydration risks we covered.

Plan regular check-ins with your prescriber. They can review how you feel, adjust your dose, and answer questions as they come up.

The long game is steady: same day each week, rotate sites, sip fluids, and keep talking with your prescriber.

3. Wilding JPH, et al. Once-weekly semaglutide in adults with overweight or obesity (STEP 1). New England Journal of Medicine. 2021. PMID 33567185.

4. Wilding JPH, et al. Weight regain and cardiometabolic effects after withdrawal of semaglutide (STEP 1 extension). Diabetes, Obesity and Metabolism. 2022. PMC9542252.

5. Lincoff AM, et al. Semaglutide and cardiovascular outcomes in obesity without diabetes (SELECT). New England Journal of Medicine. 2023. NEJMoa2307563.

Frequently asked questions

How long can you stay on Ozempic® or Wegovy®?

These medicines are made for long-term use, because obesity and type 2 diabetes are long-term conditions. Many people reach a maintenance dose and stay there for the long run. Wegovy® settles at 2.4 mg once weekly, and Ozempic® can reach up to 2 mg once weekly. How long you stay on it is a decision you make with your prescriber over time.

What is the longest study of Wegovy® so far?

The SELECT study is the longest controlled look at Wegovy® (brand of semaglutide) to date. It followed 17,604 adults for a mean of about 3.3 years. It tracked major heart-related events, called MACE. In SELECT, 6.5% of people on Wegovy® had one of these events, versus 8.0% on placebo, a hazard ratio of 0.80. That is roughly a 20% lower relative risk.

Will I regain weight if I stop Wegovy®?

Weight regain after stopping is common and expected, since the medicine manages a long-term condition. In a STEP 1 extension study, people stopped Wegovy® at week 68. By week 120, about a year off the drug, they had regained roughly two-thirds of the weight lost. A lasting gap remained, with the Wegovy® group still down about 5.6% from baseline.

Do Ozempic® and Wegovy® cause thyroid cancer?

The labels carry a boxed warning about thyroid C-cell tumors. In animal studies, semaglutide caused these tumors. It is not known whether Wegovy® or Ozempic® causes them, including medullary thyroid cancer (MTC), in people. Because of this, neither brand is for those with a personal or family history of MTC or MEN 2. Talk with your prescriber about your history.

What are the most common long-term side effects?

Stomach side effects are the most common by far. In the Wegovy® studies, 44% of people reported nausea, 30% diarrhea, and 24% vomiting. For Ozempic® at 1 mg, about 20.3% reported nausea and 9.2% vomiting. These effects are often strongest early and may ease with time. Constipation and stomach pain are also reported on both labels.

Can long-term stomach problems harm my kidneys?

In rare cases, yes, but usually through dehydration. Ongoing nausea, vomiting, or diarrhea can leave you dehydrated. The labels note rare reports of acute kidney injury linked to severe dehydration. Tell your prescriber right away if stomach symptoms do not go away. Sipping fluids and acting early helps you stay ahead of the problem and protect your kidneys.

What do we still not know about long-term use?

The longest controlled data on Wegovy® runs to about 3.3 years, from SELECT. What happens across five, ten, or twenty years is far less certain. Whether the animal thyroid signal carries over to people has not been determined. There is also no label-defined way to taper off and hold your results, so long-term questions are still being studied.

Important: This page is for education only and is not medical advice. Any medicines named here are available by prescription. Always talk to a licensed clinician about medicines, symptoms, or anything you are considering.