Wegovy Weight Loss Timeline: Week by Week
How fast does Wegovy work? Below is the week-by-week timeline based on STEP-1 trial data (Wilding et al., NEJM 2021). Numbers in the table are projected averages for a 220 lb starting weight; your individual results vary based on adherence, diet, baseline weight, sex, and individual response. Trial peak: 14.9% mean weight loss at 68 weeks. Updated May 2026.
Week-by-week Wegovy timeline
| Week | Phase | Avg loss % |
|---|---|---|
| Week 4 | Titration: 0.25 mg | 2.0% |
| Week 8 | Titration: 0.5 mg | 3.8% |
| Week 12 | Titration: 1.0 mg | 5.3% |
| Week 16 | Titration: 1.7 mg | 6.6% |
| Week 20 | Maintenance: 2.4 mg | 7.8% |
| Week 26 | Maintenance | 9.2% |
| Week 52 | Maintenance | 12.7% |
| Week 68 | STEP-1 trial endpoint | 13.7% |
Curve fit to STEP-1 data using exponential approach to plateau: pct(t) = 14.9 * (1 - exp(-t / 27.2)). Run your own projection with custom starting weight and duration on the calculator at glp1cost.org.
What to expect at each stage
Week 4: Titration: 0.25 mg
0.25 mg weeklyAppetite reduction begins. Some patients notice mild nausea, especially after the first 1 to 2 doses. Weight loss is small at this stage; the drug is acclimating, not yet at therapeutic level.
Week 8: Titration: 0.5 mg
0.5 mg weeklyAppetite suppression strengthens. GI side effects (nausea, diarrhea, constipation) often peak during this dose increase. Some weight loss visible.
Week 12: Titration: 1.0 mg
1.0 mg weeklyTherapeutic effect builds. Clinically meaningful weight loss usually visible by now. Side effects tend to ease as your body adapts unless you are about to escalate.
Week 16: Titration: 1.7 mg
1.7 mg weeklyApproaching maintenance dose. Continued weight loss. Some prescribers hold here for several weeks before final escalation if tolerability is borderline.
Week 20: Maintenance: 2.4 mg
2.4 mg weeklyFull therapeutic dose reached. Weight loss continues at a steady rate. This is the dose Wegovy was tested at in STEP-1 and the dose most patients ride to plateau.
Week 26: Maintenance
2.4 mg weeklySix months in. Roughly half of total expected weight loss has occurred. Many patients are noticing meaningful body composition changes.
Week 52: Maintenance
2.4 mg weeklyOne year in. Approaching the rate-of-loss plateau but still losing. STEP-1 reported about 13% mean loss at this point.
Week 68: STEP-1 trial endpoint
2.4 mg weeklyTrial endpoint. STEP-1 reported 14.9% mean weight loss at this time point with the rate of loss slowing toward plateau.
What affects your individual outcome
- Adherence: patients who hit 80%+ of weekly doses see results that track the trial curve. Missing doses extends timeline.
- Dose escalation pace: the standard schedule reaches 2.4 mg by week 17 but many prescribers pause longer at lower doses if tolerability is borderline. A slower escalation extends the curve.
- Starting BMI: patients with higher starting BMI tend to lose a higher absolute number of pounds but a similar percentage. The curve scales.
- Sex: women lose modestly more (1-3 percentage points) than men on the same dose in subgroup analyses across STEP trials.
- Diet quality: the appetite signal works only if you respect it. Eating past satiety because of habit or stress reduces outcomes meaningfully.
- Comorbidity meds: some medications (chronic corticosteroids, certain antipsychotics) suppress weight loss.
Frequently asked questions
How fast does Wegovy work?
Some patients notice appetite reduction within the first 1 to 2 weeks of the 0.25 mg starter dose. Visible weight loss usually begins by week 4 to 8. Clinically significant weight loss (5% or more of body weight) typically occurs by week 12 to 20 for most patients. Peak loss in the STEP-1 trial occurred around week 68 at 14.9% mean.
How much weight will I lose on Wegovy in 1 month?
In the first month you are still on the 0.25 mg starter dose, which is mostly to acclimate your body. Expected weight loss in month 1 averages 1 to 4% of starting body weight (roughly 2 to 8 lbs for a 200 lb starting weight). The 0.25 mg dose is sub-therapeutic; weight loss accelerates after dose escalation begins.
How much weight will I lose on Wegovy in 3 months?
By 12 weeks (3 months), most patients are on 1.0 mg weekly and have reached early-therapeutic effect. Average weight loss at 3 months is approximately 4 to 7% of starting body weight (roughly 8 to 14 lbs for a 200 lb starting weight), based on a curve fit to STEP-1 trial data.
How much weight will I lose on Wegovy in 6 months?
By 6 months (26 weeks), patients are typically on the maintenance 2.4 mg dose. Average weight loss is approximately 8 to 11% of starting body weight (roughly 16 to 22 lbs for a 200 lb starting weight). About half of total expected loss has occurred.
When does Wegovy weight loss plateau?
The rate of weight loss slows progressively from month 6 through month 18. STEP-1 showed weight loss continuing through the 68-week trial endpoint, with the rate slowing meaningfully after week 52. True plateau (no further loss without dietary intervention) typically occurs between months 18 and 24 for most patients on the 2.4 mg maintenance dose.
What if I am not losing weight on Wegovy?
Most non-response by month 4 to 6 is due to one of: still in titration (the 0.25 and 0.5 mg doses are sub-therapeutic), inconsistent dosing or missed weeks, eating against the appetite signal (eating when not hungry), or being on a comorbidity-suppressing medication (e.g., chronic prednisone). If you are at maintenance dose for 12+ weeks with consistent dosing and proper diet and have lost less than 5%, talk to your prescriber - some patients respond better to tirzepatide (Zepbound).
How does the Wegovy timeline compare to Zepbound?
Zepbound (tirzepatide) reaches a higher peak at 22.5% in SURMOUNT-1 over 72 weeks, with a similar exponential approach to plateau. The shapes are similar; the magnitudes differ. Patients who do not get satisfactory results on Wegovy by month 6 to 8 sometimes switch to Zepbound and see additional loss.
Will I regain weight if I stop Wegovy?
Yes, most patients do. The STEP-4 trial found that patients who stopped Wegovy after 20 weeks regained approximately two-thirds of lost weight within a year of stopping. GLP-1 medications are typically considered chronic medications for chronic weight management, similar to how blood pressure or diabetes medications are taken indefinitely.
See also
- -> Run your own projection calculator with your starting weight and duration
- -> How Much Does Wegovy Cost cost across every channel
- -> Wegovy reference page full clinical and pricing detail
- -> Wegovy Side Effects timing, severity, when to call
- -> Wegovy vs Zepbound efficacy and timeline compared
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