Wegovy Side Effects: What to Expect and Manage

Wegovy side effects are most often gastrointestinal, with nausea being the most common, along with diarrhea, vomiting, and constipation. These symptoms are usually mild to moderate, worst when you first start or increase your dose, and tend to ease as your body adjusts. Most people tolerate Wegovy well, and serious problems are uncommon.

Wegovy is a once-weekly injection of semaglutide, the same active ingredient as Ozempic but used at a higher dose and approved by the FDA for chronic weight management. It works by mimicking a natural gut hormone called GLP-1, which slows how fast your stomach empties and reduces appetite. You can read more about the biology in our guide to how semaglutide works for weight loss. This article is for information only and is based on FDA labeling. It is not medical advice, and you should talk with your own clinician about your situation.

Why Wegovy side effects happen and when they show up

The same actions that make Wegovy effective, mostly the slowing of digestion and the effect on appetite signals, are what drive most side effects. Because the maintenance dose of Wegovy (2.4 mg per week) is higher than the doses used for Ozempic, gastrointestinal effects can feel more pronounced for some people.

To limit this, Wegovy is titrated slowly. You start at 0.25 mg per week and step up gradually over roughly 16 to 20 weeks to the maintenance dose of 2.4 mg per week, which is the maximum. This slow ramp exists specifically to reduce side effects and give your body time to adjust. Symptoms are usually worst early on and in the days after each dose increase, then settle down. For a week-by-week picture, see our GLP-1 side effects timeline.

It helps to remember that a side effect being common does not mean it will be severe. In the large clinical trials of semaglutide for weight management, most gastrointestinal symptoms were rated mild to moderate, and only a minority of people stopped treatment because of them. Everyone responds a little differently: some people barely notice any symptoms, while others feel them clearly for the first few weeks. Knowing that the pattern usually improves can make the early phase easier to get through. If a dose increase brings back symptoms you thought had settled, that is expected, and it does not mean something is wrong.

Common Wegovy side effects (mostly gastrointestinal)

The most frequently reported side effects are digestive. Nausea is the single most common. Others include diarrhea, vomiting, constipation, abdominal pain, indigestion, and burping. Outside the gut, some people notice headache, fatigue, and dizziness. Most of these are mild to moderate and temporary.

Side effect	How common	Notes
Nausea	Most common	Worst early and after dose increases; usually eases within weeks
Diarrhea	Common	Stay hydrated; watch for signs of dehydration
Vomiting	Common	Persistent vomiting can lead to dehydration; contact your clinician
Constipation	Common	Fiber, fluids, and movement help; see our dedicated guide
Abdominal pain	Common	Mild is typical; severe or lasting pain needs urgent review
Indigestion and burping	Common	Smaller, lower-fat meals reduce these
Headache, fatigue, dizziness	Less common	Often related to eating less or mild dehydration

How to manage common Wegovy side effects

Most gastrointestinal side effects can be eased with simple habits while your body adjusts:

• Follow the slow titration schedule exactly as prescribed rather than rushing to a higher dose.
• Eat smaller, lower-fat meals and stop when you feel full.
• Eat slowly, since Wegovy slows stomach emptying and large or fast meals can trigger nausea.
• Stay well hydrated, especially if you have diarrhea or vomiting.
• Avoid lying down right after eating.
• Limit greasy, fried, and very rich foods, which tend to worsen nausea.

For targeted tips, see our guides on managing nausea on GLP-1 and constipation on GLP-1. Most gastrointestinal effects fade over a few weeks. A minority of people do stop Wegovy because of ongoing digestive symptoms, so if yours are not improving, talk with your clinician about options rather than changing your dose on your own.

A few practical points can make these habits easier to keep. Because Wegovy blunts appetite, it is easy to forget to eat or drink enough, which can make fatigue, dizziness, and constipation worse. Keeping a water bottle nearby and planning simple, protein-forward meals helps on both fronts. Bland, easy-to-digest foods such as crackers, rice, toast, or plain yogurt are often gentler when nausea is strongest. If certain foods reliably trigger symptoms, it is reasonable to avoid them during the weeks around a dose increase and reintroduce them later. None of these steps require changing your prescribed dose; they simply support your body while it adjusts.

Serious and rare Wegovy side effects

Serious side effects are much less common, but it helps to know the warning signs so you can act quickly.

• Pancreatitis (inflammation of the pancreas). Signs include severe, persistent abdominal pain that may radiate to your back, sometimes with vomiting. This needs urgent medical care. Learn more in our overview of GLP-1 and pancreatitis.
• Gallbladder problems. Rapid weight loss can raise the risk of gallstones and gallbladder inflammation (cholecystitis). See GLP-1 and gallbladder problems for details.
• Acute kidney injury. This usually results from dehydration caused by heavy vomiting or diarrhea, which is another reason to keep fluids up.
• Allergic reactions. Rare but possible; a severe reaction with swelling or trouble breathing is a medical emergency.

Boxed warning: thyroid tumors

Wegovy carries a boxed warning about thyroid C-cell tumors based on studies in rodents. It is not known whether this applies to humans. Because of this warning, Wegovy should not be used by people with a personal or family history of medullary thyroid carcinoma (MTC) or a genetic condition called Multiple Endocrine Neoplasia type 2 (MEN2). Our article on whether GLP-1 drugs cause thyroid cancer explains what the evidence does and does not show.

Blood sugar

Low blood sugar (hypoglycemia) is uncommon with Wegovy on its own. The risk goes up if you also take insulin or a sulfonylurea for diabetes, so those medicines sometimes need adjusting by your prescriber.

Cosmetic changes tied to rapid weight loss

Some effects people blame on the drug are really the result of losing weight quickly rather than direct drug toxicity. Facial volume loss, sometimes called "Ozempic face," happens as fat is lost from the face; you can read more in our piece on Ozempic face and skin changes. Increased hair shedding can also occur and is usually linked to fast weight loss and low protein intake rather than the medication itself; see GLP-1 hair loss causes. These changes are generally temporary and can be softened with steady weight loss and adequate protein.

How Wegovy compares and when to call your clinician

Side effect profiles are broadly similar across GLP-1 based medicines, though they can differ in intensity. If you are weighing options, our comparison of Wegovy versus Zepbound looks at both in more detail.

Contact your clinician if side effects are severe, are not improving, or are stopping you from eating and drinking normally. Seek urgent or emergency care for any of these red-flag symptoms:

• Severe or persistent abdominal pain, especially pain that spreads to your back.
• Vomiting or diarrhea so severe you cannot keep fluids down or you show signs of dehydration.
• Signs of a serious allergic reaction such as swelling of the face, lips, or throat, or trouble breathing.
• A lump or swelling in your neck, hoarseness, or trouble swallowing.

Do not change or stop your dose on your own. Your clinician can help you adjust the plan safely.