What Happens When You Stop a GLP-1? Weight Regain, Side Effects, and How to Plan

Key takeaways

• GLP-1 medications work while you take them. When treatment stops, appetite tends to return and most people regain a meaningful share of the weight they lost.
• Weight regain is a predictable effect of stopping the medication, not a sign of personal failure. Obesity is a chronic condition, and these medications are approved for long-term use.
• Improvements in blood pressure, blood sugar and cholesterol also tend to fade after stopping.
• Regain is not usually total, and regular exercise may help people hold on to more of their progress.
• If you are thinking about stopping, plan it with your clinician rather than stopping abruptly on your own.

About the research in this article

About the research: The trial results described below come from studies of FDA-approved, brand-name products: Wegovy (semaglutide), Zepbound (tirzepatide) and Saxenda (liraglutide). Compounded versions of semaglutide and tirzepatide are not FDA-approved, and the FDA does not review compounded drugs for safety, effectiveness or quality before they are marketed (FDA; FDA). These results cannot be assumed to apply to compounded versions (FDA). The planning and lifestyle guidance in this article applies to weight management generally, not to any specific product.

What happens when you stop a GLP-1?

GLP-1 medications lower appetite, increase fullness and quiet the constant thoughts about food that many people call "food noise." Those effects depend on the medication being in your body. Once you stop, they wear off over the following weeks, and your appetite and eating patterns tend to drift back toward where they were before treatment.

The body also pushes back against weight loss on its own. After any significant weight loss, hunger hormones and energy use adjust in ways that favor regaining weight. GLP-1 medications help counter that pressure while you take them. Without the medication, the pressure is still there.

That is why major medical organizations describe obesity as a chronic condition, and why Wegovy and Zepbound are approved for chronic weight management alongside a reduced-calorie diet and physical activity, much like medications for blood pressure or cholesterol that keep working only while you take them.

How much weight comes back? What the trials show

Several large trials tested what happens when people stop GLP-1 treatment by randomly switching some participants to a placebo after a period of weight loss.

Wegovy (semaglutide 2.4 mg): STEP 4 and the STEP 1 extension

In STEP 4, adults first took Wegovy for 20 weeks and lost an average of 10.6% of their body weight. They were then randomly assigned to keep taking it or switch to placebo for another 48 weeks. Those who continued Wegovy lost a further 7.9% on average, while those switched to placebo regained 6.9% (Rubino et al., 2021).

In the STEP 1 trial extension, people who had lost an average of 17.3% of their body weight on Wegovy over 68 weeks stopped treatment and were followed for another year. By week 120 they had regained 11.6 percentage points, leaving a net loss of 5.6% from where they started. Most of the improvements in blood pressure, blood sugar and other cardiometabolic measures had also moved back toward baseline (Wilding et al., 2022).

Zepbound (tirzepatide): SURMOUNT-4

In SURMOUNT-4, adults took tirzepatide (the product now sold as Zepbound) for 36 weeks and lost an average of 20.9% of their body weight. Over the next 52 weeks, those who continued lost a further 5.5%, while those switched to placebo regained 14.0%. Even so, the placebo group still weighed about 9.9% less at the end of the study than when they started (Aronne et al., 2023).

What the reviews add

Two 2026 reviews pulled this research together:

• A BMJ meta-analysis of 37 studies with more than 9,000 adults found that people regained about 0.4 kg (just under 1 lb) a month on average after stopping weight-loss medications. Regain was faster than after stopping diet and exercise programs. Blood pressure, blood sugar and cholesterol were projected to return to baseline within about 1.4 years (West et al., 2026).
• A review in eClinicalMedicine estimated that people regained about 60% of the weight they had lost within a year of stopping GLP-1 medications, with regain slowing over time. Its projection that regain levels off at about 75% is an estimate based on modeling beyond the available one-year data (Budini et al., 2026).

These are averages. Some people regain very little and others regain all of it, and the research does not yet explain who will do better.

Other changes you may notice after stopping

• Hunger and food noise return. This is often the first thing people notice, usually within weeks. It can feel sudden after months of a quieter appetite.
• Digestive side effects usually ease. Nausea, constipation and other stomach symptoms often improve once the medication leaves your system. Our guide to GLP-1 side effects covers what is common while taking these medications.
• Health markers can drift back. If your blood pressure, blood sugar or cholesterol improved during treatment, ask your clinician whether to recheck them after you stop.
• Body composition matters. Some of the weight lost during treatment is lean mass. Researchers have raised the concern that if regained weight is mostly fat, body composition could end up less favorable than before. This has not been well measured yet, but it is one more reason to keep up strength training. See our guide to GLP-1 muscle loss.

Stopping a GLP-1 does not cause withdrawal in the way some medications do. The changes come mostly from losing the medication's effect on appetite and metabolism.

Reasons people stop, and why planning helps

People stop GLP-1 treatment for many reasons: side effects, cost, insurance changes, supply problems, pregnancy plans, an upcoming surgery, or simply feeling that they have reached their goal. Some of these are good medical reasons to stop. Others may have solutions short of stopping, such as managing side effects or adjusting the dose.

Whatever the reason, a conversation with your clinician first can help you decide whether stopping is the right choice, how to do it, and what to watch for afterward.

How to keep more of your progress

No approach fully prevents regain after stopping, but these steps have the best support.

1. Build exercise habits while you are still on treatment

One randomized trial offers a useful signal. After an initial low-calorie diet, adults with obesity spent a year on supervised exercise, liraglutide 3 mg (the product sold as Saxenda), both, or placebo, and were then followed for a year without treatment. People who had taken liraglutide alone regained the most weight after stopping, about 6 kg on average, while those who had combined it with exercise regained about 2.5 kg (Jensen et al., 2024). The trial was small and studied an older medication, but it supports treating exercise as a long-term habit, not a short-term add-on.

2. Keep the structure that worked

Many people eat differently on a GLP-1 because they feel full sooner. When appetite returns, deliberate structure helps: regular meals built around protein, vegetables and fiber, fewer ultra-processed foods, and paying attention to portion sizes before hunger takes over.

3. Monitor early and act early

Regain tends to be fastest in the first months after stopping. Agree with your clinician on a check-in plan and a point, such as a certain amount of regain, at which you will revisit your options rather than waiting until most of the weight has returned.

4. Talk about tapering and maintenance options

Some clinicians gradually lower the dose instead of stopping all at once, or continue a lower maintenance dose. These approaches are reasonable to discuss, but they have not been well studied. The trials above tested stopping, not tapering, so there is not yet strong evidence on whether tapering reduces regain.

5. Plan for restarting if needed

If you stop and later decide to restart, do not simply resume your previous dose on your own. After a break, your clinician may restart you at a lower dose to reduce digestive side effects.

When to talk with your clinician

Talk with your clinician before you stop, and again if you are regaining weight quickly, if conditions such as type 2 diabetes or high blood pressure were improving on treatment, or if you are stopping because of pregnancy plans or surgery. If you have questions about how treatment and pausing work, our frequently asked questions page is a good place to start.

The bottom line

GLP-1 medications are designed for long-term use, and research consistently shows that most people regain a substantial share of their weight after stopping, along with some of the health benefits. That does not mean you can never stop, or that your effort was wasted. It means the decision deserves a plan: build exercise and eating habits that can outlast the medication, monitor early, and make the choice together with your clinician.

If you are considering weight-loss treatment, or want to talk through what long-term care might look like, Stone Health's clinician-guided weight management program starts with a licensed clinician who reviews your health history and helps you decide whether a treatment may be appropriate for you.