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Explainer

GLP-1 side effects and how to manage them

By the TreatmentMD editorial team

Updated 7 min read

A smiling bald man with a beard in a white T-shirt

Key takeaways

  • The most common side effects are nausea, vomiting, diarrhea and constipation, which usually ease over time.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sources
  • They're most common in the first weeks and after each dose increase, so doses start low and rise slowly.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sourcesThe American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sources
  • Small habits make a big difference, and your clinician can slow things down if your body needs more time.The American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sourcesCleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sources

By the TreatmentMD editorial team

If you're starting a GLP-1, you've probably heard about the side effects. Maybe a friend mentioned feeling queasy, or you've seen someone online talking about "sulfur burps".

Here's the reassuring part. The common ones are mostly tummy troubles. They're usually mild, and they tend to ease as your body gets used to the medicine.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sourcesThe American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sources

Here's what to expect, and the simple habits that help you feel your best.

01What's normal

What are the most common GLP-1 side effects?

A smiling man in a gray T-shirt with his hands resting on his stomach

Most are stomach-related. Nausea, diarrhea, vomiting and constipation top the list.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sources

Some people also notice stomach pain, indigestion, burping, heartburn, gas or bloating.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sources

They're usually mild to moderate, and not everyone gets them. In the main studies, more than half of people never had nausea at all.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sources

And most people keep going. No more than 1 in 10 stopped treatment because of side effects.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sources

Feeling queasy isn't a sign it's working, either. In the semaglutide and tirzepatide studies, people lost about the same amount of weight with or without stomach side effects.Diabetes, Obesity and MetabolismRandomized trial · 2022STEP 1 to 3Stomach side effects were mostly mild to moderate and short-lived (a typical bout of nausea lasted about 8 days), and weight loss was similar with or without them.68 weeks. People in the STEP 1, 2 and 3 trials. Funded by Novo Nordisk.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. Wharton S, et al., 2022.Read the study All sourcesDiabetes, Obesity and MetabolismRandomized trial · 2025SURMOUNT-1 to -4Stomach side effects were mostly mild to moderate and came mainly while doses were rising, and weight loss was similar with or without nausea.People in the four SURMOUNT trials, with and without type 2 diabetes. Funded by Eli Lilly.Gastrointestinal tolerability and weight reduction associated with tirzepatide in adults with obesity or overweight with and without type 2 diabetes in the SURMOUNT-1 to -4 trials. Rubino DM, et al., 2025.Read the study All sources

02Why it happens

Why do GLP-1s upset your stomach?

GLP-1s slow down how fast your stomach empties, and they quiet the hunger signals in your brain. That's a big part of how they help you eat less.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sources

Experts think those same effects are behind most tummy side effects too.The American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sources

Food stays with you longer now, so a meal that felt normal before can sit heavy. How much you eat, and how fast, makes a real difference.Cleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sources

The slowing is strongest at the start. With Zepbound® and Foundayo™, it's largest after the first dose and eases as you keep going.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sources

That's why doses start low and step up gradually. It gives your body time to adjust.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sourcesThe American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sources

03Timing

When do side effects start, and how long do they last?

They're most likely in your first weeks and each time your dose goes up. After that, they tend to come less often.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sourcesThe American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sources

Here's how it usually goes:

  1. The first few weeks

    Your body is getting used to the medicine. Some queasiness, or a change in your bathroom habits, is common.The American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sources

  2. Each step up

    A new dose can bring a short flare while your body catches up.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sources

  3. Your long-term dose

    Once you're settled on a dose, side effects tend to come less often and feel milder.The American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sources

Each bout is usually short, too. In the semaglutide studies, a typical bout of nausea lasted about a week, and diarrhea about three days.Diabetes, Obesity and MetabolismRandomized trial · 2022STEP 1 to 3Stomach side effects were mostly mild to moderate and short-lived (a typical bout of nausea lasted about 8 days), and weight loss was similar with or without them.68 weeks. People in the STEP 1, 2 and 3 trials. Funded by Novo Nordisk.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. Wharton S, et al., 2022.Read the study All sources

Constipation can hang around longer, so it's worth building good habits early.Diabetes, Obesity and MetabolismRandomized trial · 2022STEP 1 to 3Stomach side effects were mostly mild to moderate and short-lived (a typical bout of nausea lasted about 8 days), and weight loss was similar with or without them.68 weeks. People in the STEP 1, 2 and 3 trials. Funded by Novo Nordisk.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. Wharton S, et al., 2022.Read the study All sourcesThe American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sources

04Getting ready

How can you get ready for your first dose?

A little prep makes the first weeks easier:

  1. Plan lighter meals

    Eat lighter the day before your first dose, and skip the big "last hurrah" meal.Cleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sources

  2. Keep water handy

    A bottle nearby and a reminder on your phone make it easy to sip through the day.Cleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sources

  3. Know how to reach your clinician

    Ask how to message them, and check in early if side effects bother you.The American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sources

05Nausea

What helps with nausea?

Nausea is the most common side effect, and a few habits go a long way:

  1. Eat smaller meals

    Try splitting three meals into four or more smaller ones. Think of it as giving your stomach a little breathing room.Eli Lilly and CompanySourceLilly. Zepbound®: side effects, and tips for managing them. Checked October 6, 2026.Open the source All sourcesCleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sources

  2. Don't go too long without eating

    Nausea often shows up in the morning or after a long gap. A small breakfast and regular meals help.The American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sources

  3. Eat slowly, and stop when you're full

    It can take your brain up to 30 minutes to notice you're full, so pause and check in.Cleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sourcesEli Lilly and CompanySourceLilly. Zepbound®: side effects, and tips for managing them. Checked October 6, 2026.Open the source All sources

  4. Go easy on greasy food

    Fatty, greasy or spicy foods can be harder to handle.Eli Lilly and CompanySourceLilly. Zepbound®: side effects, and tips for managing them. Checked October 6, 2026.Open the source All sourcesNovo NordiskSourceNovo Nordisk. Wegovy®: side effects, and tips for managing nausea. Checked October 6, 2026.Open the source All sources

  5. Keep bland foods handy

    Toast, crackers, rice or soup are easy on your stomach.Eli Lilly and CompanySourceLilly. Zepbound®: side effects, and tips for managing them. Checked October 6, 2026.Open the source All sourcesNovo NordiskSourceNovo Nordisk. Wegovy®: side effects, and tips for managing nausea. Checked October 6, 2026.Open the source All sources

  6. Try ginger or peppermint tea

    Both may help settle your stomach. Skip the sweetener.The American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sourcesCleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sources

  7. Stay upright, and get some fresh air

    Sit up for about 30 minutes after eating, and step outside if you feel queasy.Cleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sourcesNovo NordiskSourceNovo Nordisk. Wegovy®: side effects, and tips for managing nausea. Checked October 6, 2026.Open the source All sources

If nausea sticks around, your clinician can prescribe something to help, or give you more time on your current dose.The American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sourcesU.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sources

06Constipation

What helps with constipation?

Constipation is common with weight loss in general, and it can linger longer than nausea.The American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sourcesDiabetes, Obesity and MetabolismRandomized trial · 2022STEP 1 to 3Stomach side effects were mostly mild to moderate and short-lived (a typical bout of nausea lasted about 8 days), and weight loss was similar with or without them.68 weeks. People in the STEP 1, 2 and 3 trials. Funded by Novo Nordisk.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. Wharton S, et al., 2022.Read the study All sources It's easiest to get ahead of early:

  1. Sip water through the day

    Fluids keep things moving. If water fills you up at meals, drink between them instead.Cleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sourcesThe American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sources

  2. Add fiber slowly

    Fruit, vegetables and dried fruit like prunes help. Build up gradually so your stomach can keep up.The American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sources

  3. Keep moving

    Even a short walk helps get your gut going.Cleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sources

  4. Ask about a gentle helper

    If that's not enough, your clinician or pharmacist can suggest something that suits you.The American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sourcesCleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sources

And a small footstool in the bathroom really does help. It puts your body in an easier position.Cleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sources

07Other tummy troubles

What about diarrhea, vomiting, burping and heartburn?

A few other tummy troubles can come and go. Here's what helps each one:

  1. Diarrhea

    Drink plenty of clear fluids, or something with electrolytes. Stick to bland foods like broth, rice or carrots, and go easy on dairy, caffeine and alcohol for a while.Eli Lilly and CompanySourceLilly. Zepbound®: side effects, and tips for managing them. Checked October 6, 2026.Open the source All sourcesCleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sources

  2. Vomiting

    Give your stomach a break, then sip water slowly. Big meals make it more likely, so keep portions small.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sourcesThe American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sources

  3. Burping

    Some people notice eggy "sulfur burps", and slower digestion may play a part. Eat slowly, skip fizzy drinks, and go easy on eggs, broccoli and onions if they seem to set it off. It usually improves within a few weeks.Inspira HealthSourceInspira Health. GLP-1s and burping: what you should know. November 20, 2025.Open the source All sources

  4. Heartburn and bloating

    Smaller meals, fewer fizzy drinks and staying upright after eating all help.Cleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sourcesInspira HealthSourceInspira Health. GLP-1s and burping: what you should know. November 20, 2025.Open the source All sources

Sip fluids through the day, and let your clinician know if nausea, vomiting or diarrhea doesn't go away.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sources

08Other effects

What about tiredness and other side effects?

Some people feel more tired than usual. It's a common side effect, so you're not imagining it. A few get headaches or feel a little dizzy.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sourcesNovo NordiskSourceNovo Nordisk. Wegovy®: side effects, and tips for managing nausea. Checked October 6, 2026.Open the source All sources

Eating less can mean drinking less, too, and that can leave you feeling flat. Keep meals regular and sip water through the day.Cleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sourcesThe American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sources

With the shots, a little redness or itching where you inject can happen. Changing the spot each week helps.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sources

09Staying on track

How do you stay on track if side effects hit?

A smiling woman in white activewear with one hand on her stomach

Talk to your clinician before you stop or skip a dose. Side effects usually ease, and there's a lot they can do in the meantime.The American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sourcesCleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sources

If a step up feels rough, they may keep you on your current dose a little longer. Or they may settle on a lower dose that suits you.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sources

They can also prescribe something for nausea, or suggest a different medicine if one doesn't agree with you.The American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sourcesCleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sources

And tell them about any side effect that bothers you or doesn't go away. That's exactly what they're there for.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sourcesNovo NordiskSourceNovo Nordisk. Wegovy®: side effects, and tips for managing nausea. Checked October 6, 2026.Open the source All sources

That's why easy access to your care team matters when you choose a program. Messaging and regular check-ins make it simple to adjust as you go.

Frequently asked questions.

Why do I feel it most a day or two after my shot?

That's when the medicine is near its highest level.

After a weekly shot, it peaks within about one to three days.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sources

Keeping meals light and small around then can help, and so can going easy on high-fiber food right after your shot.Cleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sources

How much water should I drink?

There's no single number for everyone.

Sip through the day, and set a reminder if you tend to forget.

With diarrhea, drink more: Lilly suggests at least 8 to 10 glasses of clear fluids a day.Cleveland ClinicSourceCleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026.Open the source All sourcesEli Lilly and CompanySourceLilly. Zepbound®: side effects, and tips for managing them. Checked October 6, 2026.Open the source All sources

Do GLP-1 pills cause the same side effects as the shots?

Mostly, yes.

The Wegovy® pill and Foundayo™ cause similar stomach side effects, mostly early on and after dose increases.

The same habits help.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sources

There's no injection-site redness with a pill, of course.

Here's how pills and shots compare.

Do compounded GLP-1s have side effects?

They can, and the habits here can help whichever medicine you take.

Your clinician sets your dose and pace, and can slow things down if you need it.

Here's how compounded GLP-1s work.

Will a GLP-1 make my hair fall out?

Some people notice more hair shedding while they're losing weight, and it's more common in women.U.S. Food and Drug AdministrationSourceFDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.All sourcesEli Lilly and CompanySourceLilly. Foundayo™: frequently asked questions. Checked October 6, 2026.Open the source All sources Your clinician can talk it through with you if you notice it.

Is it OK to drink alcohol?

Go easy.

Alcohol can make nausea and heartburn worse, so keeping it to a minimum helps.The American Journal of Clinical NutritionSourceMozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367.Open the source All sources

The bottom line

Most GLP-1 side effects are tummy troubles that show up early and ease with time.

Smaller meals, slower eating, plenty of fluids and a clinician who can adjust your pace make them much easier to handle.

When you're ready, compare programs on our ranking to find one with the support you want.

By the TreatmentMD editorial team

Medical disclaimerThis content is for informational purposes only and is not medical advice. Always consult a qualified healthcare provider before starting any weight-loss program or medication. Individual results may vary.

Sources9 sources, and product and safety information
  1. 1FDA prescribing information for Wegovy® (injection and tablets), Zepbound® and Foundayo™: Dosage and Administration; Adverse Reactions; Clinical Pharmacology; Patient Counseling Information; Medication Guides.
  2. 2Mozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Am J Clin Nutr. 2025;122(1):344-367. doi.org
  3. 3Cleveland Clinic. How to manage the digestive side effects of GLP-1 medications. September 9, 2026. clevelandclinic.org
  4. 4Wharton S, Calanna S, Davies M, et al. 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 Obes Metab. 2022;24(1):94-105. doi.org
  5. 5Rubino DM, Pedersen SD, Connery L, et al. Gastrointestinal tolerability and weight reduction associated with tirzepatide in adults with obesity or overweight with and without type 2 diabetes in the SURMOUNT-1 to -4 trials. Diabetes Obes Metab. 2025;27(4):1826-1835. doi.org
  6. 6Lilly. Zepbound®: side effects, and tips for managing them. Checked October 6, 2026. lilly.com
  7. 7Novo Nordisk. Wegovy®: side effects, and tips for managing nausea. Checked October 6, 2026. wegovy.com
  8. 8Inspira Health. GLP-1s and burping: what you should know. November 20, 2025. inspirahealthnetwork.org
  9. 9Lilly. Foundayo™: frequently asked questions. Checked October 6, 2026. lilly.com

Product information

  • Zepbound® (tirzepatide) is a prescription-only injectable medication FDA-approved for chronic weight management in adults with obesity, or adults with overweight who have at least one weight-related medical condition. It is also approved for the treatment of moderate to severe obstructive sleep apnea in adults with obesity, and should be used in combination with a reduced-calorie diet and increased physical activity.
  • Ozempic® (semaglutide) is a prescription-only injectable medication approved by the U.S. Food and Drug Administration (FDA) for the treatment of type 2 diabetes. It is not FDA-approved for weight loss; however, weight reduction has been observed in some individuals with type 2 diabetes using the medication.
  • Mounjaro® (tirzepatide) is a prescription-only injectable medication FDA-approved for the treatment of type 2 diabetes. It is not FDA-approved for weight loss; however, weight reduction has been observed in some individuals using the medication.
  • Wegovy® (semaglutide) is a prescription-only injectable medication FDA-approved for chronic weight management in adults with obesity, or adults with at least one weight-related medical condition, when used alongside a reduced-calorie diet and increased physical activity.
  • All medications require a medical evaluation and prescription from a licensed healthcare provider. Individual results may vary.

Important safety information

  • Compounded semaglutide and tirzepatide are prepared by state-licensed pharmacies and are not FDA approved. The FDA does not review their safety, effectiveness or quality, and clinical trial results for brand-name drugs do not carry over to them.
  • Semaglutide and tirzepatide carry a boxed warning for a risk of thyroid C-cell tumors, based on animal studies, and are not for anyone with a personal or family history of medullary thyroid carcinoma (MTC) or MEN2, or who is pregnant. Other warnings include pancreatitis, gallbladder problems, and a higher risk of low blood sugar when combined with insulin or a sulfonylurea. The most common side effects are digestive, such as nausea, vomiting, diarrhea and constipation.
  • This is a high-level summary, not a complete list. A licensed clinician will review your health history to decide whether a GLP-1 medication is right for you.

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