Wegovy Constipation: Clinical Data, Causes & How to Keep It Under Control
Yes, Wegovy can cause constipation, and about 1 in 4 people get it, so you're in good company. In clinical trials of Wegovy (semaglutide), 24% of adults had it, compared with 11% on placebo (Wegovy prescribing information). Because it builds up over days, a record makes all the difference. Glapp, the GLP-1 tracker, lets you log constipation right next to your Wegovy doses, so you can see how long each stretch lasts and whether it's easing.
Key numbers
| Number | What it means |
|---|---|
| 24% | of adults on Wegovy had constipation in its weight-loss trials, vs 11% on placebo |
| 8,915 | users currently tracking Wegovy-related constipation in Glapp |
Wegovy constipation: what the clinical evidence shows
Wegovy's prescribing information pools placebo-controlled weight-loss trials of semaglutide 2.4 mg in adults. Constipation and related digestive symptoms:
| Side effect | Placebo | Wegovy 2.4 mg |
|---|---|---|
| Constipation | 11% | 24% |
| Abdominal pain | 10% | 20% |
| Abdominal distension (bloating) | 5% | 7% |
| Flatulence (gas) | 4% | 6% |
Source: Wegovy prescribing information, Table 3.
In STEP 1 (1,961 adults, 68 weeks), digestive side effects were reported by 74.2% on semaglutide 2.4 mg vs 47.9% on placebo, mostly mild to moderate and temporary (Wilding et al., NEJM 2021).
Why does Wegovy cause constipation?
Semaglutide slows how your gut moves food along, which is part of why you feel full. Slower movement can mean harder, less frequent stools. Eating much less also means less food, and often less fiber and fluid, passing through.
Fluids, fiber, movement and routine all play a part, and they're different for everyone. Your Glapp check-ins show which days and habits line up with constipation.
Fiber, fluids and movement: the three things that matter most
Constipation on Wegovy usually comes down to slower digestion plus less going in. Three things make the biggest difference:
- Fiber. Most adults need around 25–30 g of fiber a day, and eating less often means getting far less. Vegetables, fruit, beans, oats and whole grains all count.
- Fluids. Fiber needs water to work; without enough, it can make things worse.
- Movement. Even a daily walk helps keep your gut moving.
Track your Wegovy constipation with a GLP-1 tracker app
Constipation creeps up: by the time you notice, days have passed. A GLP-1 tracker keeps the record for you: log it each day next to your Wegovy doses, and you're in control. You'll know how uncomfortable it gets and whether it's easing, and you'll walk into your next appointment with facts instead of guesses.
Why Glapp? It's a top-rated GLP-1 tracker used by 100,000+ people, rated 4.8/5 on Trustpilot and the App Store, and 4.6/5 on Google Play. Glapp grew out of Reddit GLP-1 support groups and is built by developers who are GLP-1 users themselves, so most features come straight from community requests. Its features are grounded in peer-reviewed research and published clinical trial data, core tracking is free, and it works on iPhone, Android and web with your data synced across devices. Here's how to use it over your first 30 days.
Glapp does not provide medical advice or treat side effects. It shows your daily check-ins against your estimated medication levels so you have structured data to share with your prescriber.
Day 1: Start tracking your constipation
Use Glapp's daily check-in to record constipation and rate how severe it feels.
Daily entries help you see whether constipation is getting better, getting worse or staying the same. You'll have a clear record of how you felt, without having to remember every day.
Day 3: Compare symptoms with your estimated Wegovy level
Glapp estimates your medication level throughout the day using your dose and injection time. Semaglutide typically reaches its highest blood concentration 1–3 days after an injection.
Seeing your symptoms alongside this estimate helps you spot when constipation appears within your shot cycle. As you log more days, you can look for a repeating pattern and know when to pay closer attention.
The medication level is an estimate, not a blood test, and a matching pattern does not prove what caused your symptoms.
Day 7: See how your constipation changes over time
Open the side-effects chart in the Progress tab and choose the period you want to review. Your daily ratings appear on a timeline, making it easier to see whether a difficult day was an isolated episode or part of a longer trend.
Day 14: Look for patterns in your weekly report
Glapp's weekly progress report brings your logged data together, with dedicated sections showing your side effects and how they change.
Does constipation tend to return on the same day after your shot? Does it coincide with changes in hunger or food noise? Reviewing two weeks of entries can help you spot patterns that are easy to miss day by day, and give you specific questions to discuss with your doctor.
Day 30: Bring a clear record to your doctor
After a month, review the bigger picture: is constipation becoming less frequent, staying the same or getting worse? Semaglutide generally reaches a steady repeating level after about four to five weeks of weekly injections at the same dose.
Create a doctor's report in Glapp and choose the information to include. Your doctor can review your symptom history alongside your doses and progress, giving you a more focused conversation about your treatment.
Start tracking your Wegovy constipation in Glapp
Wegovy constipation and dose increases: from 0.25 mg to 2.4 mg
Wegovy starts at 0.25 mg once weekly and steps up every four weeks: 0.5 mg, 1 mg, 1.7 mg, then 2.4 mg maintenance from week 17. Wegovy's prescribing information also allows a higher 7.2 mg dose for some adults. The semaglutide trial figure for constipation is at 2.4 mg and isn't broken down by step.
Your weekly progress report shows whether constipation changed after a step.
See every dose in the Wegovy dosage chart.
What to bring to your prescriber
A simple log shows your prescriber the pattern at a glance:
| Week | Dose | Constipation days | Longest run of days | Peak rating | Other side effects logged |
|---|---|---|---|---|---|
| Example 1 | 1 mg | 4 | 3 | Med | Bloating |
| Example 2 | 1 mg | 5 | 4 | High | Bloating, flatulence |
| Example 3 | 1 mg | 3 | 2 | Med | None |
| Example 4 | 1 mg | 2 | 2 | Low | None |
Questions you could ask. They're conversation starters, not recommendations; your prescriber decides what, if anything, to change.
- "I've had constipation four days in a row this week. Is that expected on Wegovy?"
- "Is there a laxative or fiber supplement you'd suggest with Wegovy?"
- "Should constipation change how we plan my next dose step?"
Severe stomach pain, vomiting or being unable to pass stool or gas needs urgent care; Wegovy's prescribing information lists bowel obstruction among post-marketing reports.
Frequently asked questions
How long does Wegovy constipation last?
It varies more than other stomach side effects. For many people it's worst in the first weeks and after a dose step, then improves as digestion adjusts and fiber, fluids and movement catch up. If you go more than three days without a bowel movement, or it keeps coming back, talk to your prescriber.
Does Wegovy cause bloating and gas?
Yes, both were more common than on placebo: bloating 7% vs 5%, gas 6% vs 4%.
How common is constipation on Wegovy?
24% of adults on Wegovy 2.4 mg had constipation in the weight-loss trials, compared with 11% on placebo.
How do I track Wegovy constipation?
Log it in Glapp's daily check-in and rate it low, medium or high. Progress shows your ratings over time, so you can see whether it's easing.
About the data
Ratings are self-reported and medication levels are estimated from dose and timing, not measured. This page is for information only and is not medical advice; talk to your prescriber about any side effect.
About the author
We're GLP-1 patients and health tech professionals, building Glapp in collaboration with doctors. About us
Sources
- Novo Nordisk. Wegovy (semaglutide) injection prescribing information: Table 3, post-marketing experience, dosage (section 2), pharmacokinetics.
- Wilding JPH et al. Once-weekly semaglutide in adults with overweight or obesity (STEP 1). NEJM, 2021.