# Wegovy Week by Week: What to Expect in Your First 20 Weeks

> On Wegovy, expect the first 4 weeks (0.25 mg) to bring mild appetite reduction and modest 1–2% weight loss; weeks 5–8 (0.5 mg) roughly 3–5%; weeks 9–12 (1 mg) — often the side-effect peak — about 5–7%; weeks 13–16 (1.7 mg) about 7–10%; and from week 17 you reach the 2.4 mg maintenance dose, with about 10–12% loss by 6 months and ~15% on average by 12–16 months. Side effects cluster around each dose increase and fade as your body adjusts.

![Illustration of five hourglasses in a row with sand progressively draining from first to last — representing week-by-week progress on Wegovy.](https://tryimbue.com/images/learn/wegovy-weekly-hourglasses.jpg)

Canonical: https://tryimbue.com/learn/wegovy-week-by-week
Last clinically reviewed: 2026-07-20 by Dr. Prajeet Reddy, MD (Medical Director, Cyane Medical Group California PC)

Wegovy (semaglutide) is an FDA-approved once-weekly injection for weight management. This guide explains what to expect as your dose gradually increases over the first several months and beyond.

## How the Dose Increases

Your dose will increase slowly over 16 weeks to give your body time to adjust. Each dose lasts 4 weeks before moving to the next level:[[1]](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=ee06186f-2aa3-4990-a760-757579d8f77b)

| Phase | Weeks | Weekly Dose |
|---|---|---|
| Starting dose | 1–4 | 0.25 mg |
| Dose increase #1 | 5–8 | 0.5 mg |
| Dose increase #2 | 9–12 | 1.0 mg |
| Dose increase #3 | 13–16 | 1.7 mg |
| Maintenance dose | 17 onward | 2.4 mg |

Inject once a week on the same day each week, at any time of day, with or without food. Rotate injection sites between your abdomen, thigh, or upper arm.

## Weeks 1–4 (0.25 mg): Getting Started

**What you may notice:**

- Mild decrease in appetite and feeling full sooner at meals[[2]](https://www.nejm.org/doi/full/10.1056/NEJMoa2032183)
- Some nausea, especially in the first 1–2 days after your injection
- Mild constipation or loose stools

**Weight loss:** modest — typically 1–2% of your starting body weight by the end of month 1. Some people notice little change at this stage, and that is normal. This dose is mainly to help your body adjust.

**Tips:**

- Eat smaller meals and stop eating when you feel full — do not push through fullness[[3]](https://jamanetwork.com/journals/jama/fullarticle/10.1001/jama.2025.11153)
- Avoid greasy, fried, or very rich foods
- Stay well hydrated throughout the day

## Weeks 5–8 (0.5 mg): Building Up

**What you may notice:**

- Appetite suppression becomes more noticeable
- Nausea may briefly return or increase for 1–2 days after the dose change, then improve
- You may notice less interest in snacking or smaller portion sizes

**Weight loss:** gradual — approximately 3–5% of starting body weight by the end of month 2.[[2]](https://www.nejm.org/doi/full/10.1056/NEJMoa2032183)

**Tips:**

- Eat slowly and chew food thoroughly
- Try eating 4–5 smaller meals instead of 2–3 large ones
- Ginger tea or peppermint tea may help with nausea

## Weeks 9–12 (1.0 mg): Gaining Momentum

**What you may notice:**

- This is often when side effects peak for many people — nausea, bloating, or constipation may be most noticeable during this phase
- Appetite is usually significantly reduced
- Some people notice changes in food preferences (less desire for sweets or heavy foods)[[2]](https://www.nejm.org/doi/full/10.1056/NEJMoa2032183)

**Weight loss:** becoming more noticeable — approximately 5–7% of starting body weight by the end of month 3.

**Tips:**

- If nausea is bothersome, talk to your provider — they may recommend a short course of anti-nausea medication or slowing the dose increase[[3]](https://jamanetwork.com/journals/jama/fullarticle/10.1001/jama.2025.11153)
- For constipation: increase water and fiber intake; a stool softener may help
- Prioritize protein at each meal (chicken, fish, eggs, beans, Greek yogurt) to help maintain muscle[[4]](https://linkinghub.elsevier.com/retrieve/pii/S0002-9165(25)00240-0)

## Weeks 13–16 (1.7 mg): Approaching Maintenance

**What you may notice:**

- Side effects often begin to improve as your body adjusts
- Strong appetite suppression continues
- Energy levels may improve as weight decreases

**Weight loss:** approximately 7–10% of starting body weight by the end of month 4.[[2]](https://www.nejm.org/doi/full/10.1056/NEJMoa2032183)

**Tips:**

- Continue eating regular, balanced meals even if your appetite is low — skipping meals can worsen nausea
- Aim for at least 60–75 grams of protein per day[[4]](https://linkinghub.elsevier.com/retrieve/pii/S0002-9165(25)00240-0)
- Stay physically active — aim for 150 minutes per week of moderate activity (such as brisk walking)[[5]](https://jamanetwork.com/journals/jama/fullarticle/10.1001/jama.2026.4106)

## Week 17 and Beyond (2.4 mg): Maintenance Phase

**What you may notice:**

- Most gastrointestinal side effects have improved significantly by this point
- Appetite control is well established
- Weight loss continues gradually for many months

**Weight loss milestones (based on clinical studies):**[[2]](https://www.nejm.org/doi/full/10.1056/NEJMoa2032183)

- By 6 months: approximately 10–12% of starting body weight
- By 12–16 months: approximately 15% of starting body weight on average
- In clinical trials, about 1 in 3 people lost 20% or more of their body weight — an amount similar to some weight-loss surgeries

Weight loss typically continues for about 60 weeks before leveling off. Continued use of the medication is important, as weight regain is common if the medication is stopped.

## Side Effects at a Glance

The most common side effects are stomach-related and are usually worst during the first few months while your dose is increasing. They tend to improve over time. Rates below are from the FDA-approved prescribing information:[[1]](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=ee06186f-2aa3-4990-a760-757579d8f77b)

| Side Effect | How Common | When It Usually Happens |
|---|---|---|
| Nausea | Very common (~44%) | Worst during dose increases; usually improves after a few days at each new dose |
| Diarrhea | Common (~30%) | During dose increases; episodes are usually short (2–4 days) |
| Vomiting | Common (~25%) | During dose increases; usually triggered by eating too much or too quickly |
| Constipation | Common (~24%) | Can occur at any time; may persist longer than other side effects |
| Stomach pain or bloating | Common (~20%) | During dose increases |
| Decreased appetite | Expected effect | Throughout treatment |

## When to Call Your Provider

Contact your healthcare provider if you experience:

- Severe or persistent nausea or vomiting that prevents you from eating or drinking for more than 24 hours
- Signs of dehydration (dark urine, dizziness, rapid heartbeat)
- Severe stomach or abdominal pain that does not go away (could be a sign of pancreatitis or gallbladder problems)[[1]](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=ee06186f-2aa3-4990-a760-757579d8f77b)
- Symptoms of an allergic reaction (rash, swelling, difficulty breathing)

## Key Reminders

- **Take your injection on the same day each week.** If you miss a dose, take it as soon as possible as long as your next scheduled dose is more than 2 days (48 hours) away — in practice, up to about 5 days after your usual injection day. If less than 2 days remain before your next dose, skip the missed one and resume on your regular day. If you miss 2 or more weeks in a row, contact your provider — you may need to restart at a lower dose to reduce the risk of stomach-related side effects.[[1]](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=ee06186f-2aa3-4990-a760-757579d8f77b)
- **Store your pen in the refrigerator.** It can be kept at room temperature for up to 28 days.
- **This medication works best alongside a healthy diet and regular physical activity.** It is not a substitute for lifestyle changes.[[5]](https://jamanetwork.com/journals/jama/fullarticle/10.1001/jama.2026.4106)
- **Everyone responds differently.** Some people lose weight faster or slower than the averages listed above. What matters is the overall trend over months, not week-to-week changes.
- **Do not stop the medication without talking to your provider.** Weight regain is common after stopping.[[2]](https://www.nejm.org/doi/full/10.1056/NEJMoa2032183)

## Frequently asked questions

### How much weight will I lose in the first month of Wegovy?

Typically modest — about 1–2% of your starting body weight by the end of month 1. The 0.25 mg starting dose is mainly to help your body adjust, so noticing little change at this stage is normal.

### When do Wegovy side effects peak?

For many people, weeks 9–12 (the 1.0 mg phase) is when nausea, bloating, or constipation is most noticeable — and side effects briefly return for a day or two after each dose increase. They typically improve significantly by the maintenance phase (week 17+).

### How much weight do people lose on Wegovy by 6 and 12 months?

Based on clinical studies: approximately 10–12% of starting body weight by 6 months, and about 15% on average by 12–16 months. Around 1 in 3 people lost 20% or more — comparable to some weight-loss surgeries. Weight loss typically continues for about 60 weeks before leveling off.

### When does Wegovy reach the full dose?

Week 17, after four 4-week steps: 0.25 mg → 0.5 mg → 1.0 mg → 1.7 mg → 2.4 mg maintenance. Your provider may hold a step longer if side effects need more time to settle.

### What if I miss a Wegovy dose?

If your next scheduled dose is more than 2 days (48 hours) away, take the missed dose as soon as possible — in practice, you have up to about 5 days after your usual injection day. If less than 2 days remain, skip it and resume on your regular day. If you miss 2 or more doses in a row, contact your provider — you may need to restart at a lower dose and work back up.