Short answer
Most of the weight comes back. In STEP 4, people switched from semaglutide to placebo after 20 weeks regained weight while those who stayed on kept losing. In SURMOUNT-4, stopping tirzepatide after 36 weeks led to substantial regain over the following year. The trials treat these as long-term medicines, and the labels say the prescriber decides how and whether to stop.
The two trials that answer this
STEP 4, published in JAMA in 2021, put 803 adults on semaglutide for 20 weeks, then randomized them to continue or switch to placebo for 48 more weeks. The placebo group regained a large share of the weight; the semaglutide group kept losing. SURMOUNT-4, published in JAMA in 2024, did the same with tirzepatide in 670 adults: 36 weeks on the drug, then continue or stop for a year. Stopping led to substantial regain.
Why that isn’t a surprise
These drugs work while they are in your body, by acting on gut-hormone receptors that affect appetite and how full you feel. Take them away and the appetite signals return. The weight loss in the trials is a treatment effect, not a reset, which is why the FDA labels describe them as for chronic weight management and why the trials themselves were designed to test continuation.
If you need to stop
The labels give rules for missed doses, and the Wegovy label says to stop at least two months before a planned pregnancy. Beyond that, the label leaves stopping to the prescriber. The trials suggest that whatever you do with food and strength training matters more once the drug is gone, which is the same evidence base as our $0 longevity stack.
Related questions
Can you take a lower maintenance dose?
The labels set maintenance doses: Wegovy at 2.4 mg or 1.7 mg, Zepbound at 5, 10 or 15 mg. Anything else is a prescriber’s decision.
Is the regain worse than never taking it?
The trials compared stopping with continuing, not with never starting. They show regain toward baseline, not beyond it.
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Published 2026-09-30 · Last checked 2026-09-30
Educational content, not medical advice. Made for the United States.