Key takeaways:
Semaglutide is FDA approved to treat Type 2 diabetes and metabolic-associated steatohepatitis (MASH). It’s also approved for weight management and to lower the risk of heart attack, stroke, and worsening kidney disease in people with Type 2 diabetes.
Semaglutide can cause many side effects. The most common ones include nausea, gas, bloating, and stool changes. Most of these side effects last a few days to a few weeks.
You can try changing your diet and taking over-the-counter medications to prevent or treat semaglutide side effects. But they usually go away on their own over time.
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Semaglutide is FDA approved to treat Type 2 diabetes and metabolic-associated steatohepatitis (MASH). It’s also approved for weight management and to lower the risk of heart attacks, stroke, and worsening kidney disease in people with diabetes. There are three forms of semaglutide: Ozempic, Wegovy, and Rybelsus.
Semaglutide works by copying a gut hormone called glucagon-like peptide-1 (GLP-1). This hormone affects your liver, gut, and brain to help control appetite and improve blood sugar management.
Like any medication, semaglutide can cause side effects. But these side effects usually go away over time as your body adjusts to the medication. While you wait for your body to adapt, there are steps you can take to stay comfortable.
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What are the most common side effects of semaglutide?
The most common semaglutide side effects involve your gut and include:
Vomiting
Abdominal pain
Gas and bloating
Experts think these side effects develop because semaglutide delays the movement of food through your gut.
But semaglutide can cause other symptoms outside your gut, including:
Fatigue
Dizziness
These side effects are likely related to semaglutide’s effect on blood sugar levels.
How long do semaglutide side effects usually last?
Many semaglutide side effects improve over time as your body adjusts to the medication. Typically, they last for a few days or weeks. But they can come back if you increase your semaglutide dose.
In clinical trials, some side effects lasted longer than others. Here’s a closer look:
Nausea: usually got better within a few days to a week
Diarrhea: also improved in less than a week
Vomiting: typically only lasted a few days
Constipation: could last weeks to months, but it usually improved over time
Key factors affecting the duration of side effects
How long semaglutide’s side effects last vary by person. It can also depend on:
Dose increases: It’s common to have an increase in side effects if you need to increase the dose. This is also usually temporary.
Adjustment period: Some people take longer than others to get used to the medication. Unfortunately, there’s no way to predict how people will respond to it.
Medication half-life: A medication half-life is the time it takes for the medication’s initial concentration in the body to decrease by half. The half-life of semaglutide is about 1 week. It stays in the system for 5 to 7 weeks.
How common are semaglutide side effects?
Real-world studies have shown that some semaglutide side effects are more common than others:
Nausea affects up to half of people taking semaglutide.
Diarrhea occurs in up to 1 in 4 people.
Vomiting is also reported in up to 1 in 4 people.
Constipation happens in up to 1 in 3 people, though some studies report only 1 in 10.
Stomach pain affects up to 1 in 5 people.
About 1 in 10 people experience gas or bloating.
Headaches, fatigue, or dizziness occur in roughly 1 in 10 people.
People taking higher doses of semaglutide are more likely to have side effects than those taking lower doses.
Luckily, studies also show that most of these side effects go away over time as the body adjusts to the medication. Only about 4% to 14% of people stop taking semaglutide because of side effects. This means that for most people, the benefits of semaglutide outweigh the discomfort of side effects. It also suggests that most people find side effects manageable and not too severe.
What are the best ways to manage semaglutide side effects?
There are ways to manage semaglutide side effects so you can stay comfortable and get the full benefits of your medication. The best strategies depend on your symptoms. Let’s look at the best ways to manage semaglutide side effects by symptom.
Nausea and vomiting
Nausea is the most commonly reported side effect. It’s usually mild and goes away on its own. But it can come back anytime you increase your dose.
You can take the following steps to lessen this nausea from semaglutide:
Avoid trigger foods, especially highly processed or fatty foods.
Eat smaller, more frequent meals.
Try natural nausea remedies like ginger tea or ginger gummies.
Use the lowest dose of semaglutide that’s effective for you.
Increase your dosage slowly.
Talk with your healthcare team about prescription nausea medications like ondansetron (Zofran).
Diarrhea
Diarrhea from semaglutide is often mild and goes away on its own. You can use the following strategies to help with diarrhea:
Drink plenty of water or low-sugar electrolyte drinks to stay hydrated.
Avoid foods and beverages that may worsen diarrhea, like sugary drinks, caffeinated beverages, and high-fat foods.
Talk with your healthcare team about over-the-counter (OTC) products like loperamide (Imodium). These medications can slow down your gut and may worsen other semaglutide side effects. So, it’s important to talk with your healthcare team before trying them.
Constipation
Constipation is one of the longer-lasting side effects of semaglutide. It can take up to 6 weeks to go away. But you can try several approaches to relieve this symptom:
Drink plenty of water to keep your stool soft so it’s easier to pass.
Eat more fiber or try fiber supplements to bulk your stool. This helps make it easier to pass.
Stay active to help your gut move better.
Create a regular bowel routine to encourage consistent bowel movements.
Talk with your healthcare team about laxatives like polyethylene glycol (Miralax) or sennosides (Senna) to treat your symptoms.
Gas and bloating
Gas and bloating will go away on their own as your body gets used to semaglutide. You can reduce gas and bloating with these tips:
Chew food completely before ingesting it. This will help you swallow less air.
Avoid carbonated beverages, which can introduce more air into your stomach.
Eat fewer gas-producing foods, such as beans and lentils.
Talk with your healthcare team about OTC products like simethicone (Gas-X).
Headache
People taking semaglutide usually develop headaches because of dehydration or lower blood sugar levels. You can use the following management strategies to prevent or cope with this effect:
Drink plenty of fluids to keep you hydrated.
Check your blood sugar regularly if you have diabetes.
Eat a snack if your blood sugar is lower than usual.
Try an OTC pain reliever like acetaminophen (Tylenol) or ibuprofen (Motrin) to relieve an occasional headache. Talk with your healthcare team about other options if you need to take these regularly for headaches. There are other options that work better to relieve chronic headaches.
Dizziness
Like headaches, dizziness can be from dehydration or low blood sugar. To help manage and reduce dizziness, you can:
Drink plenty of fluids to keep you hydrated.
Check your blood sugar regularly if you have diabetes.
Eat a snack if your blood sugar is lower than usual.
Change positions slowly to help your body adjust. Sit briefly before standing, and stand up slowly before walking.
Fatigue
You might feel tired at first after starting semaglutide. This can be from lower blood sugar levels or from your body adjusting to eating fewer calories. Some tips to help cope with semaglutide fatigue include the following:
Eat smaller, more frequent meals to keep blood sugar levels steady.
Choose nutrient-dense foods so smaller meals are still packed with calories, vitamins, and minerals.
Include complex carbohydrates like nonstarchy vegetables and whole grains that maintain a steady blood sugar.
When should you seek care for semaglutide side effects?
Contact your healthcare team if semaglutide side effects:
Don’t go away within a week
Don’t get better with the management strategies discussed above
Aren’t relieved with OTC medications
Your healthcare team may offer prescription options to relieve symptoms. They may also suggest adjusting your semaglutide dose.
It’s rare, but some semaglutide side effects can be an emergency. Semaglutide has been linked to serious medical conditions including:
Hypoglycemia (low blood sugar) in people with Type 2 diabetes
Worsening diabetic retinopathy
Gastroparesis (stomach paralysis) and intestinal blockages
An eye condition called non-arteritic anterior ischemic optic neuropathy (NAION)
Get medical care right away if you experience:
Vomiting or diarrhea that stops you from eating or drinking
Less urine output than normal
Low blood sugar that doesn’t get better after eating 15 g of carbohydrates
Blood sugar lower than 55 mg/dL
Chest pain
Changes in heart rate or palpitations
Fainting
Intense stomach pain that doesn’t go away or gets worse
Stomach pain that gets worse when you eat
Yellowing of your eyes or skin
Vision changes or loss of vision
Allergic reactions to semaglutide are possible. Call 911 if you or a loved one develops signs of anaphylaxis (a serious allergic reaction) after taking semaglutide. Signs include:
Hives
Trouble breathing
Wheezing
Chest tightness
Trouble swallowing
Throat tightness or swelling
Swelling of the eyelids, lips, or tongue
Vomiting, diarrhea, or abdominal pain
Frequently asked questions
It varies by person, but semaglutide side effects often start within a day or two of taking the medication. They can begin within hours of taking the medication, though.
Semaglutide doesn’t cause chest pain. If you have chest pain, it’s best to get medical attention right away.
If you’re considering stopping semaglutide, it’s best to discuss this with your prescriber first. This is because it often depends on your dose and how long you’ve been taking it. You might want to consider lowering the dose before stopping. Know that when you stop taking semaglutide, the side effects above should go away, but there may be other unwanted effects like weight gain or high blood sugar.
It varies by person, but semaglutide side effects often start within a day or two of taking the medication. They can begin within hours of taking the medication, though.
Semaglutide doesn’t cause chest pain. If you have chest pain, it’s best to get medical attention right away.
If you’re considering stopping semaglutide, it’s best to discuss this with your prescriber first. This is because it often depends on your dose and how long you’ve been taking it. You might want to consider lowering the dose before stopping. Know that when you stop taking semaglutide, the side effects above should go away, but there may be other unwanted effects like weight gain or high blood sugar.
The bottom line
Semaglutide side effects are often temporary — they usually last a few days or weeks. These side effects often go away on their own as your body adjusts to the medication. But they can briefly return if you need to increase your medication dose.
You can manage semaglutide side effects with diet changes and OTC medications. Contact your healthcare team if these strategies aren’t working. They may suggest prescription treatments to relieve your symptoms or adjust your semaglutide dosing schedule.
Get immediate medical care if you develop signs of an allergic reaction, low blood sugar, vision changes, or intense stomach pain while taking semaglutide.
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References
Chao, A. M., et al. (2022). Clinical insight on semaglutide for chronic weight management in adults: Patient selection and special considerations. Drug Design, Development and Therapy.
Garvey, W. T., et al. (2022). Two-year effects of semaglutide in adults with overweight or obesity: The STEP 5 trial. Nature Medicine.
Gasoyan, H., et al. (2025). Reasons for discontinuation of obesity pharmacotherapy with semaglutide or tirzepatide in clinical practice. Obesity.
Gorgojo-Martínez, J. J., et al. (2022). Clinical recommendations to manage gastrointestinal adverse events in patients treated with GLP-1 receptor agonists: A multidisciplinary expert consensus. Journal of Clinical Medicine.
MedlinePlus. (2026). Semaglutide injection.
Novo Nordisk. (2026). Wegovy - Semaglutide tablets 25mg, injection 1.7mg | 2.4mg | 7.2mg [package insert].
Reale, J. (n.d.). How to build a stellar bowel routine. Southern Pelvic Health.
Wharton, S., et al. (2021). Gastrointestinal tolerability of once‐weekly semaglutide 2.4 mg in adults with overweight or obesity, and the relationship between gastrointestinal adverse events and weight loss. Diabetes, Obesity & Metabolism.
