Educational content, reviewed for accuracy against published clinical literature. Not medical advice.
Most GLP-1 side effects are gastrointestinal, often appear during dose increases, and tend to ease as your body adjusts. This guide covers the most common side effects, why they happen, and what may help.
GLP-1 medications can cause a range of side effects, particularly involving the digestive system. Many of these effects are related to how GLP-1 medications slow stomach emptying and affect appetite and food intake. Side effects can be more noticeable after starting treatment or increasing the dose.
Why GLP-1s Cause Side Effects
GLP-1 medications slow how quickly the stomach empties and act on appetite and reward signals in the brain. These effects can contribute to many of the common side effects associated with treatment.
Side effects are often more noticeable after a dose increase and may become easier to manage as the body adjusts to the medication.
The Ten Most Common Side Effects
- Nausea: Nausea is one of the most common GLP-1 side effects. It can become more noticeable after dose increases and often improves as your body adjusts. Learn how to manage GLP-1 nausea.
- Constipation: Constipation can persist longer than some other digestive side effects. Adequate fluids, dietary fiber, and regular movement may help. Learn more about GLP-1 constipation.
- Diarrhea: Diarrhea can occur during GLP-1 treatment and may be influenced by certain foods or changes in eating patterns. Learn how to manage GLP-1 diarrhea.
- Acid reflux and heartburn: Slower stomach emptying and increased fullness can contribute to reflux symptoms in some people. Learn more about GLP-1 acid reflux.
- Fatigue: Fatigue can occur during treatment and may sometimes be related to eating too little, dehydration, or other changes that accompany reduced appetite. Learn more about GLP-1 fatigue.
- Under-eating: Appetite suppression can make it difficult to consume enough food and nutrients. Learn how to recognize and manage under-eating on a GLP-1.
- Hair shedding: Hair shedding can occur during periods of rapid weight loss and may reflect temporary telogen effluvium rather than a direct effect of the medication. Learn more about GLP-1-related hair shedding.
- Dizziness: Dizziness can have several possible causes during GLP-1 treatment, including dehydration, low blood sugar in people taking glucose-lowering medications, or changes in blood pressure. Learn more about dizziness on GLP-1s.
- Bloating and early fullness: Slower stomach emptying can make you feel full after smaller amounts of food and may contribute to bloating or abdominal pressure. Learn how to manage bloating and early fullness.
- Food aversions and taste changes: Some people experience changes in how foods taste or how appealing certain foods feel while taking a GLP-1 medication. Learn more about food aversions and taste changes.
When to Contact Your Provider
Many GLP-1 side effects can be managed with changes to eating habits, hydration, and other supportive measures. Contact your healthcare provider if a symptom is severe, keeps you from eating or drinking, persists longer than expected, or becomes difficult to manage.
Seek prompt medical attention for concerning symptoms such as severe abdominal pain, fainting, chest pain, blood in vomit or stool, or other symptoms that feel urgent.
How Blum Helps
- Side effect logging helps you track symptoms day by day and identify patterns you can discuss with your healthcare provider
- Food logging via AI photo or voice can help identify meals associated with nausea, reflux, bloating, or other digestive symptoms
- Chef bot generates GLP-1-friendly recipes based on your nutritional goals or specific side effects
- Community, Pods, and Nora AI provide tools for questions and support as you navigate changes during treatment
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Key Takeaways
- Most common GLP-1 side effects involve the digestive system
- Nausea, constipation, diarrhea, reflux, bloating, and early fullness can occur as the medication changes stomach emptying and appetite
- Side effects may become more noticeable after a dose increase and can improve as your body adjusts
- Reduced appetite can sometimes make it difficult to eat and drink enough
- Changes in taste and food preferences can affect what foods feel appealing or tolerable
- Severe, persistent, or concerning symptoms should be discussed with your healthcare provider
- This is general educational information. Please discuss your specific situation with your healthcare provider.
Sources
- Wilding JPH et al. STEP 1. NEJM 2021. https://www.nejm.org/doi/full/10.1056/NEJMoa2032183
- Jastreboff AM et al. SURMOUNT-1. NEJM 2022. https://www.nejm.org/doi/full/10.1056/NEJMoa2206038
Related Articles
- How to Manage Nausea on GLP-1s
- GLP-1s and Acid Reflux
- Bloating and Early Fullness on GLP-1 Medications
- Food Aversions and Taste Changes on GLP-1s
This article is general educational information about GLP-1 medications and is not medical advice. It does not replace guidance from your prescriber or pharmacist. Always follow your healthcare provider’s instructions, and contact them about any symptom that is severe, persistent, or concerning.
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