GLP-1 medications are approved for long-term use with no maximum duration, and the withdrawal trials show most people regain weight when they stop.
These drugs are labeled for chronic weight management, the same way blood pressure or cholesterol drugs are labeled for ongoing use. SURMOUNT-4 is the cleanest demonstration. After 36 weeks on tirzepatide (average 20.9% weight loss), participants were randomized to keep taking it or switch to placebo. From week 36 to 88, the placebo group regained 14.0% of body weight while the continued-treatment group lost an additional 5.5%, a 19.4-point gap. And 89.5% of continuers kept off at least 80% of what they had lost, compared with 16.6% of switchers. Long-term extension studies now run past two years with no new safety concerns emerging. So the honest framing is: this is a long-term treatment for a chronic condition. Discuss duration with your prescriber up front, because planning to stay on is planning to succeed, and stopping is when the weight typically returns.
What to do
Common questions
How long can you stay on a GLP-1?
There is no time limit in the prescribing information for GLP-1 drugs like Wegovy or Zepbound. They are approved for chronic, long-term weight management, and the evidence says obesity behaves like other chronic conditions: the medication works while you take it. The clearest data comes from the SURMOUNT-4 withdrawal trial. Everyone took tirzepatide for 36 weeks and lost an average of 20.9% of body weight. Then half were switched to placebo. Over the next year, those switched to placebo regained 14.0% of their weight, while those who stayed on tirzepatide lost another 5.5%. Nearly 9 in 10 people (89.5%) who continued the drug maintained at least 80% of their initial loss, versus 16.6% of those switched off. Trials have now followed patients for two years and beyond without new safety signals, and labels set no maximum duration. The practical answer: you can stay on as long as the drug is working, you tolerate it, and you and your prescriber agree. Most regain after stopping is the rule, not the exception, so plan for long-term use rather than a short course.