How Long Does Wegovy Take to Work?

Quick Answer

Wegovy starts affecting appetite within the first week or two, but noticeable weight loss usually takes 4–12 weeks. The dose is increased gradually over 16–20 weeks, and clinical trials show peak weight loss at roughly 60–68 weeks (about 15–16 months) of continuous use.

Wegovy Weight-Loss Timeline

Timeframe	What Typically Happens
Week 1–2	Reduced appetite and earlier fullness begin; little visible weight change
Week 4	Some early weight loss (often 1–3% of body weight) as dose titrates up
Week 8–12	Weight loss becomes more noticeable; nausea usually eases
Week 16–20	Full maintenance dose (2.4 mg) typically reached
Week 28–40	Steady, ongoing weight loss continues
Week 60–68	Peak average weight loss (~15% of body weight in trials)

How Wegovy Works

Wegovy contains semaglutide, a GLP-1 receptor agonist. It mimics a gut hormone that signals fullness to the brain, slows stomach emptying, and reduces appetite. Because these effects build as the dose increases, results are gradual rather than immediate.

Dose Titration Schedule

Wegovy is started low and increased every 4 weeks to reduce side effects:

Weeks	Weekly Dose
1–4	0.25 mg
5–8	0.5 mg
9–12	1 mg
13–16	1.7 mg
17+	2.4 mg (maintenance)

Most of the appetite-suppressing benefit strengthens as you approach the 2.4 mg maintenance dose.

Factors That Affect How Fast Wegovy Works

• Starting weight and metabolism — Individual response varies widely.
• Diet and physical activity — Wegovy works best combined with reduced-calorie eating and exercise.
• Dose level — Full effect requires reaching the maintenance dose.
• Consistency — Missing weekly injections slows progress.
• Other medications and health conditions — Can influence appetite and weight.

What Results to Expect

In the STEP clinical trials, adults using Wegovy alongside lifestyle changes lost an average of about 15% of their body weight over 68 weeks, compared with about 2.4% for placebo. Roughly one-third of participants lost 20% or more. Weight loss tends to plateau after the first year as the body reaches a new set point.

Tips to Get the Most From Wegovy

• Take your injection on the same day each week, with or without food.
• Eat smaller, protein-rich meals to work with the appetite changes.
• Stay hydrated and increase fiber to manage constipation and nausea.
• Do not increase your dose faster than prescribed—slower titration reduces side effects.
• Keep up regular physical activity to protect muscle mass.

When to See a Doctor

Contact your doctor if you have severe or persistent nausea, vomiting, or abdominal pain, which can signal pancreatitis or gallbladder problems. Seek urgent care for signs of a serious allergic reaction. If you have lost little or no weight after several months at the full maintenance dose, talk with your provider about whether Wegovy is right for you.