Does Wegovy Cause Diarrhoea? Here’s What You Should Know

Introduction

Starting a weight reduction journey is always exciting, but it can sometimes cause changes in your body that may come as a surprise. Wegovy is one such medicine, which may be used for weight management in adults who are obese or overweight with other health issues like diabetes, high BP, etc¹. But, this efficacious diabetes medication, which offers significant weight-management benefits as well, has been shown to cause some common gastrointestinal side effects such as nausea, vomiting, diarrhoea, constipation, and belly pain¹. Because of these side effects, many people may feel anxious about taking Wegovy or even stop the medication soon after starting. However, these side effects are common initially until your body adjusts to the medicine. So, do not feel overwhelmed!

This article will help you understand more about Wevogy including what it is and how it works, what causes these side effects, how you can manage them better and also suggest some dietary modifications that can help you tolerate the medicine better knowing these aspects can help you make informed decisions and try Wegovy more comfortably.

What is Wegovy?

Wegovy, which is a medication used for weight management, has semaglutide, a Glucagon-like peptide-1 receptor agonist (GLP-1 RA), as its active ingredient. Wegovy comes as a pre-filled pen injection holding a solution. It is mainly used for weight loss alongside healthy diet and regular exercise in:

• Adults with obesity
• Adults who are overweight with health issues like diabetes, blood pressure, sleep apnoea, high cholesterol or history of blood vessel problems or stroke
• Adolescents aged 12 years and older who have a BMI at or above the 95th percentile for their age¹.

Wegovy works by acting like Glucagon-like peptide-1 (GLP-1), which is a hormone produced naturally by the body to manage appetite¹. Following are the ways by which it works:

• Promotes Fullness: It helps you feel full by reducing hunger and cravings by acting on the hypothalamus of the brain².
• Slows Digestion and Suppresses Appetite: It slows down digestion (slows stomach emptying) so food stays in the stomach for longer, helping you eat less^1,2. However, this digestive-slowing effect is strongest early in intervention and lessens over time.
• Maintains Blood Sugar Levels: It helps the body release more insulin typically when the blood sugar is high and lower the hormone glucagon (which raises blood sugar levels)². This can help regulate blood sugar levels and reduce the sharp rise in blood sugar that happens particularly after a meal.

The combined effect of low appetite, slow digestion and blood sugar control helps contribute to managing weight over time. Wegovy also improves metabolic health by controlling blood sugar and reducing bad cholesterol and total cholesterol levels³.

Does Wegovy Cause Diarrhoea?

Evidence from clinical trial studies shows that Wegovy has gastrointestinal side effects like diarrhoea, vomiting, nausea, abdominal discomfort, etc. These symptoms may occur often, and diarrhoea is one among such commonly occurring issues⁴. In addition to trial data, reports from everyday medication use (real-world data) and safety monitoring after approval showed that diarrhoea is a common side effect, and it occurs soon after starting medication in most⁵. Most of the gastrointestinal side effects, including diarrhoea, are non-serious, and these can range from mild to moderate⁶. Usually, they do not need changing or stopping the medication; however, sometimes these side effects may require delayed dosing, dose reduction, slower titration or even course discontinuation².

As mentioned earlier, diarrhoea is a common side effect of Wegovy. In the following sections, we will discuss the relationship between Wegovy and diarrhoea.

Why Does Wegovy Cause Diarrhoea?

The main cause of wegovy diarrhoea is that Wegovy mimics GPL-1, which is a natural hormone, by slowing down the processes of digestion¹. This in turn affects the movement of food and water through the gut.

The mechanism includes:

• Neurohormonal effects on digestion: Wegovy can influence gut hormones and brain pathways that control digestion. This may disturb intestinal coordination, which can cause diarrhoea⁷.
• Slow gastric emptying but increased intestinal muscle contraction: While Wegovy delays emptying of the stomach, it can sometimes cause muscles in the colon (lower part of gut) to contract fast, resulting in an uncoordinated movement of food, causing diarrhoea⁸.
• Reduced water absorption: Fast movement of food and stool through the colon reduces the absorption of water, resulting in loose watery stools.
• Changes in nutrient absorption: Wegovy changes how the body absorbs some nutrients like sodium from the gut, which may lead to diarrhoea⁹.

How Long Does Wegovy Diarrhoea Last?

Now you might have understood why does Wegovy cause diarrhoea. Along with it, it is also important to know how long the diarrhoea lasts so that you can take measures to manage it.

Duration and Patterns of Diarrhoea:

• General pattern: Gastrointestinal (GI) side effects with Wegovy, such as diarrhoea, are usually most common in the initial phase of medication (first four weeks) and during dose escalation¹⁰. Diarrhoea can range from mild to moderate in intensity and is mostly non-serious. The intensity and frequency of diarrhoea generally decrease over time as therapy continues.
• Median duration: In a meta-analysis of STEP trials, diarrhoea was the second most common GI side effect reported by patients on semaglutide 2.4mg, with the median duration of diarrhoea lasting for 3 days. Many patients reported that the diarrhoea lessened as the body adapted to the medicine⁶.
• Individual variation: The duration of diarrhoea can vary from person to person. In some it might be seen for a few days, but in some it might persist longer.

How to Manage Diarrhoea Caused by Wegovy?

Diarrhoea, being a common GI side effect of Wegovy, can be managed effectively along with other side effects. The following steps can help you better tolerate this medicine:

1. Counselling

Patient education plays an important role before and after starting the medication to help you manage side effects and continue treatment safely.

• Your doctor will explain about the medication and its possible side effects in detail to you. You must understand that diarrhoea is a possible common side effect of Wegovy, especially during the early weeks of medication. This side effect is temporary and improves as your body adjusts to the medication.
• Your doctor will explain to you why Wegovy is started at a lower dose and then increased gradually. This gradual dose increase might help reduce the GI side effects and improve how well you tolerate the medicine. You should take the medicine exactly as advised by your doctor and should avoid changing the dose on your own.
• Your doctor will suggest some dietary and lifestyle modifications to be followed with Wegovy. Ensure to stick to these and update your doctor regularly about your health changes¹⁰.

2. Lifestyle Changes

It’s important to follow some dietary and eating pattern modifications while on Wegovy to minimise the GI side effects and deal with diarrhoea.

• Staying hydrated: Adequate fluid intake is very important to replace the fluid lost through diarrhoea¹¹. Drink fluids like water, broth, or oral rehydration solutions. Avoid alcohol, sugary drinks and drinks that hold caffeine; these can increase dehydration and irritate the gut.
• Modifying diet: Avoid spicy, fatty, or high-fibre foods, especially during the first few days of therapy. Go for easy-to-digest foods like rice, toast, etc. (For details, read the section below)
• Adopting supportive eating habits:
  • Eat slowly and only if you feel you are hungry
  • Eat smaller meals more often
  • Go for smaller meal portions and avoid lying down soon after taking meals
  • Stop eating if you feel you are full
  • Eat several small meals throughout the day
  • Avoid drinking with a straw
  • Do not engage in heavy activities soon after meals
  • Leave time between your last meal and sleep¹⁰.

3. Medical Intervention

If your diarrhoea gets worse, persists for a long time, or makes you feel extremely tired, seek medical attention. Your doctor can help by adjusting your dose, managing other GI conditions and suggesting symptomatic medication.

• Checking for preexisting GI disorders: Your doctor will assess for and manage any other preexisting GI conditions, such as gastroesophageal reflux disease. They may also lower the dose of any concurrent medications being taken like Metformin to help reduce the likelihood of severe gastrointestinal side effects and improve overall tolerability^10,11.
• Adjusting dose: If diarrhoea becomes worse, your doctor might pause increasing the dose. He might check whether the symptom resolves on maintaining the current dose. He might also suggest medicines to help with your symptoms, and if the symptoms improve, he might retain the current dosage or increase it. If the side effects continue even after dose adjustment, he might consider stopping the medication or switching to an alternative medication¹¹.
• Antidiarrheals: For short term relief, your doctor might suggest using probiotics or antidiarrheal medicines such as loperamide. These are just meant for temporary management, not for long-term use. Do not self-medicate and let your doctor analyse whether these are safe and appropriate for you and prescribe accordingly¹¹.

Remember, experiencing small stomach discomforts does not mean that your medication is failing. Stay informed, follow the dietary and lifestyle changes suggested by your doctor and stick to the prescribed dosing plan. Consult your doctor if you feel you can’t deal with the side effects. Your doctor will adjust your dose, suggest additional supportive measures, and assess the need to change/stop Wegovy.

Foods to Eat and Avoid While Taking Wegovy

Choosing proper foods while taking Wegovy can help get the best results and also lower the risk of some common GI side effects.

Foods You Can Eat:

• Bland (plain and mild) refined cereals: Rice, plain pasta, toast, crackers, etc
• Lean protein sources (low fat): Boiled or grilled chicken, fish, eggs, tofu, fresh cheese (in moderation)
• Low-fibre cooked vegetables: Green beans, carrots, pumpkin, sweet potatoes (peeled)
• Healthy fats: Avocado, nuts (almonds, walnuts), seeds (chia, flax), fish (salmon, mackerel), virgin olive oil¹².

Foods You Should Avoid:

• High-fat and fried foods: Fast food, fried snacks, creamy dishes
• Spicy foods: Chilli, pepper, hot sauces
• High-fibre foods (during the early stage of intervention): Bran, whole grains, raw vegetables (cauliflower, garlic, mushrooms, onions), fruits (snow peas skinned fruits, apples, apricots, blackberries, mangoes, etc), legumes
• Sugary foods: Sweets, desserts, soft drinks, etc
• Caffeinated drinks: Coffee, strong tea, and energy drinks
• Other: Carbonated beverages, alcohol, dairy products, hot and cold drinks, heavy meals¹⁰.

Conclusion

Wegovy is a highly effective medical approach for weight management, but like any other intervention, it can also cause gastrointestinal side effects like diarrhoea, mainly during the initial stages of therapy or dose escalation. Understanding the relationship between Wegovy and diarrhoea can help you manage symptoms through hydration, dietary changes, and lifestyle adjustments, as diarrhoea caused by Wegovy is usually mild to moderate, and its frequency and intensity decrease with time. However, you must always seek your doctor’s advice if any symptoms persist or get worse over time so that medication can be adjusted to suit your needs.

Also Read: Wegovy Diet Plan: Complete Food Guide, Side Effect Management & Meal Ideas

Frequently Asked Questions (FAQs)

References

1. EMA. Wegovy – European Medicines Agency [Internet]. European Medicines Agency. 2021. Available from: https://www.ema.europa.eu/en/medicines/human/EPAR/wegovy
2. Kommu S, Whitfield P. Semaglutide [Internet]. PubMed. Treasure Island (FL): StatPearls Publishing; 2024. Available from: https://www.ncbi.nlm.nih.gov/books/NBK603723/
3. Sokary S, Bawadi H. Exploring beyond Numeric Weight Loss: the Metabolic Effects of Semaglutide. Clinical Nutrition ESPEN [Internet]. 2025 Mar; Available from: https://www.sciencedirect.com/science/article/pii/S2405457725001019
4. Shu Y, He X, Wu P, Liu Y, Ding Y, Zhang Q. Gastrointestinal Adverse Events Associated with semaglutide: a Pharmacovigilance Study Based on FDA Adverse Event Reporting System. Frontiers in Public Health [Internet]. 2022 Oct 20;10. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC9631444/
5. Liu L, Chen J, Wang L, Chen C, Chen L. Association between Different GLP-1 Receptor Agonists and Gastrointestinal Adverse reactions: a real-world Disproportionality Study Based on FDA Adverse Event Reporting System Database. Frontiers in Endocrinology [Internet]. 2022 Dec 7;13. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC9770009/
6. Wharton S, Calanna S, Davies M, Dicker D, Goldman B, Lingvay I, 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, Obesity and Metabolism [Internet]. 2021 Oct 4;24(1). Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC9293236/
7. Wegeberg AML, Hansen CS, Farmer AD, Karmisholt JS, Drewes AM, Jakobsen PE, et al. Liraglutide Accelerates Colonic Transit in People with Type 1 Diabetes and polyneuropathy: a randomised, double-blind, placebo-controlled Trial. United European Gastroenterology Journal [Internet]. 2020 Jul 1 [cited 2022 Nov 13];8(6):695–704. Available from: https://pubmed.ncbi.nlm.nih.gov/32390563/
8. Nakamori H, Iida K, Hashitani H. Mechanisms Underlying the Prokinetic Effects of Endogenous glucagon-like peptide-1 in the Rat Proximal Colon. American Journal of Physiology-Gastrointestinal and Liver Physiology [Internet]. 2021 Dec 1 [cited 2022 Mar 31];321(6):G617–27. Available from: https://pubmed.ncbi.nlm.nih.gov/34643099/
9. Gutzwiller JP, Hruz P, Huber A, Hamel CP, Zehnder C, Juergen Drewe, et al. Glucagon-Like Peptide-1 Is Involved in Sodium and Water Homeostasis in Humans. Digestion [Internet]. 2006 Jan 1 [cited 2023 Apr 25];73(2-3):142–50. Available from: https://karger.com/dig/article/73/2-3/142/105742
10. Gorgojo-Martínez JJ, Mezquita-Raya P, Carretero-Gómez J, Castro A, Cebrián-Cuenca A, de Torres-Sánchez A, et al. Clinical Recommendations to Manage Gastrointestinal Adverse Events in Patients Treated with Glp-1 Receptor Agonists: a Multidisciplinary Expert Consensus. Journal of Clinical Medicine [Internet]. 2023 Jan 1;145. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC9821052/
11. Wharton S, Davies M, Dicker D, et al. Managing the gastrointestinal side effects of GLP-1 receptor agonists in obesity: recommendations for clinical practice. Postgrad Med. 2022;134(1):14-19. Available from: https://pubmed.ncbi.nlm.nih.gov/34775881/
12. Gentinetta S, Sottotetti F, Cena H, Manuelli M. Dietary Recommendations for the Management of Gastrointestinal Symptoms in Patients Treated with GLP-1 Receptor Agonist. Diabetes Metabolic Syndrome and Obesity [Internet]. 2024 Dec 1;Volume 17:4817–24. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC11668918/

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