How Long Does Wegovy Take to Work?
Reviewed by Sydney Duong, RD, GLPeak Clinical Lead · Last updated 2026-06-17
Quick answer: Most patients notice reduced appetite within 1–2 weeks of starting Wegovy. Measurable weight loss usually begins within the first month. Full effect is reached after reaching maintenance dose (1.7 mg or 2.4 mg), typically 16–20 weeks into treatment.
What happens when
- Days 1–7: appetite suppression often noticeable. 'Food noise' often quieter.
- Weeks 2–4: 2–4 lb weight loss is common; some patients lose more, some less.
- Weeks 5–16: titrating up through 0.5, 1.0, 1.7 mg. Steady weight loss for most.
- Weeks 17+: 2.4 mg maintenance. Trial data shows continued loss through week 68.
Why titration takes so long
Wegovy titrates slowly to limit GI side effects. The 0.25 mg starter dose is sub-therapeutic for weight loss — it's an adjustment period. Meaningful clinical effect builds as the dose climbs.
What if it's not working?
About 1 in 10 patients are non-responders (defined as <5% weight loss after 12 weeks at maintenance dose). Talk to your prescriber. Options include switching to Zepbound, adding lifestyle support, or evaluating for other causes.
Frequently asked questions
How long until I lose weight on Wegovy?
Most patients see 2–4 lb of weight loss in the first month. Steady loss continues through titration. The STEP 1 trial showed continued weight loss through 68 weeks for most patients.
Will I notice anything from the first injection?
Many patients notice reduced appetite or quieter food cravings within the first week. Significant weight loss in week 1 is uncommon.
Why am I not losing weight on Wegovy?
Common reasons: still on a titration dose, not at maintenance long enough, intake higher than perceived, low protein/muscle loss confusing the scale. If you're at 2.4 mg for 12+ weeks with <5% loss, talk to your prescriber.
Does Wegovy work faster at higher doses?
Higher doses produce greater appetite suppression and more weight loss on average, but 'faster' is the wrong frame — the titration schedule is designed to limit side effects, not delay results.
References
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Educational only — not medical advice. Consult your prescriber before changing any medication.