In short
When you stop a GLP-1, much of the lost weight often comes back. In the STEP 1 trial extension, participants regained about two thirds of their weight loss one year after stopping semaglutide. In SURMOUNT-4, those switched to placebo regained 14% of their body weight in a year, while those who stayed on tirzepatide lost a further 5.5%. Never stop on your own: plan the next phase with your doctor, focusing on muscle, protein and follow-up.
It is the question many people ask after a few months of treatment: “Will I have to take this medication for life?” The honest answer is that no one can make that call for you. But withdrawal studies give clear benchmarks, and they help you make an informed decision.
In this article
- What the withdrawal trials show
- Why the weight comes back
- Reasons for stopping, and the options
- A 5-point plan for what comes next
- Physical activity helps, but it is not magic
- What we do not know yet
- When to go back to your doctor after stopping
- Questions to bring to your next appointment
- Frequently asked questions
- Sources
What the withdrawal trials show
Two trials were designed specifically to measure what happens when people stop.
| Trial | Drug | Treatment phase | After stopping (placebo) | If treatment continues |
|---|---|---|---|---|
| STEP 1 extension (2022) | Semaglutide | −17.3% over 68 weeks | Regained 11.6 points in a year; net −5.6% at week 120 | Not studied in the extension |
| SURMOUNT-4 (JAMA, 2024) | Tirzepatide | −20.9% over 36 weeks | +14.0% between weeks 36 and 88 | A further −5.5%; −25.3% overall |
In SURMOUNT-4, 89.5% of people who stayed on tirzepatide kept at least 80% of their weight loss, compared with 16.6% in the placebo group. In the STEP 1 extension, the cardiometabolic improvements (blood pressure, blood sugar, lipids) gained during treatment drifted back toward baseline for most measures one year after stopping.
The STEP 1 authors concluded that these findings “confirm the chronicity of obesity” and suggest ongoing treatment is required to maintain the benefits.
Obesity is a chronic disease
The Canadian adult obesity clinical practice guideline (Obesity Canada, published in CMAJ in 2020) describes obesity as a chronic disease that needs long-term care, not a lack of willpower. Regaining weight after stopping treatment is not a personal failure.
Why the weight comes back
GLP-1s act on appetite and fullness for as long as you take them. When you stop, hunger gradually returns to its previous level, while your lighter body burns slightly less energy. If weight loss came with muscle loss, resting energy use and strength drop further. That is one reason we put so much emphasis on protecting muscle mass during treatment.
Reasons for stopping, and the options
People stop for many reasons: side effects, cost, shortages, a planned pregnancy, or simply wanting to “see.” Each calls for a different conversation with your doctor.
- Cost. Generic semaglutide has been arriving in Canada since 2026 and is often much cheaper. See our article on generic semaglutide in Canada.
- Side effects. These can often be managed by adjusting the pace or your eating. See Ozempic nausea: what helps.
- Pregnancy. Talk to your doctor before trying to conceive: they will tell you when to stop.
- Tapering instead of stopping. Some people discuss a maintenance dose or a longer interval with their doctor. That choice is medical and individual: we do not provide dosing schedules.
Do not change anything without your doctor
Do not stop or change your treatment on your own, especially if you have type 2 diabetes. Your doctor or pharmacist can help you plan a safe stop or transition.
A 5-point plan for what comes next
Prepare these with your care team
- A realistic goal. Talk about the long-term weight or health status you are aiming for, not just the number on the scale.
- Strength training. At least two sessions a week, as Canadian guidelines recommend. Our 4-week plan is a good start.
- Structured meals. Protein at every meal, fibre and regular meals help manage returning appetite.
- Close follow-up. Weight, waist size and blood tests in the months after stopping, with an agreed threshold for going back to see your doctor.
- Support. A dietitian, kinesiologist, psychologist or support group: weight management is easier as a team.
Physical activity helps, but it is not magic
Exercise alone does not fully make up for losing the drug’s effect on appetite. But it protects muscle, improves cardiovascular fitness and blood sugar, and it is part of every maintenance recommendation. A 2022 meta-analysis on daily steps also linked regular walking with lower mortality, regardless of weight.
What we do not know yet
Withdrawal trials have limits, and it is only fair to spell them out.
- They are short. STEP 1 followed participants for one year after stopping, and SURMOUNT-4 for about a year as well. We know little about what happens three or five years later.
- The stop was abrupt. In these trials, participants switched straight to placebo. Gradual tapering or spacing out doses has been studied much less. That is a topic to discuss with your doctor, not to improvise.
- These are averages. Some people regain little, others regain everything. We cannot yet predict well who will be in which group.
- Real life differs from trials. Participants had close follow-up and lifestyle counselling. Without that support, results may differ, in either direction.
These uncertainties do not change the main message: stopping should be planned, and follow-up should continue afterwards.
When to go back to your doctor after stopping
Agree on a warning sign with your doctor ahead of time: for example, regaining a few kilograms quickly, cravings that are hard to manage, or rising blood sugar or blood pressure. Going back early makes it possible to adjust the plan before all the weight returns.
Questions to bring to your next appointment
Before any decision about stopping, it helps to write down your questions. For example: what weight change should prompt me to call you? Which blood tests or measurements should we repeat, and when? Could a lower-cost option, such as a generic, change the picture? Would a referral to a dietitian or a physiotherapist help me keep my muscle? Bringing a written list makes a short appointment far more useful.
Frequently asked questions
Will I regain all the weight after Ozempic?
Not necessarily all of it. In the STEP 1 extension, participants had regained on average two thirds of the weight they lost one year after stopping, for a net change of −5.6% from the start. Individual results vary widely.
How long should you take a GLP-1?
There is no universal duration. Trials suggest the benefits last mainly while treatment continues. The decision is made with your doctor based on your health, goals and how well you tolerate the drug.
Can I stop all at once?
Do not change your treatment without talking to your doctor or pharmacist, who can advise you based on your situation, especially if you have diabetes.
Does lost muscle come back after stopping?
Not on its own. Muscle is rebuilt with strength training and enough protein. Weight regained without training is often mostly fat.
Does generic semaglutide change things?
It may make long-term treatment more affordable. In 2026, Health Canada authorized a first generic semaglutide indicated for weight management. Talk to your doctor and pharmacist.
Talk to a health professional
This article summarizes studies. It does not replace personalized medical advice.
Sources
- Wilding JPH et al. Weight regain and cardiometabolic effects after withdrawal of semaglutide: the STEP 1 trial extension. Diabetes Obes Metab, 2022 (PubMed)
- Aronne LJ et al. Continued treatment with tirzepatide for maintenance of weight reduction (SURMOUNT-4). JAMA, 2024 (PubMed)
- Wharton S et al. Obesity in adults: a clinical practice guideline. CMAJ, 2020
- Obesity Canada. Clinical practice guidelines
- Health Canada. Canada approves first generic semaglutide for weight loss, June 2026
- Paluch AE et al. Daily steps and all-cause mortality. Lancet Public Health, 2022 (PubMed)
This article is for information only and does not replace advice from a health professional. Talk to your doctor, pharmacist or a registered dietitian before changing your treatment, diet or exercise.
