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GLP-1 injection side effects: What you should know

GLP-1 injection side effects: What you should know
Dr. Constance Odom, MD
Dr. Constance Odom, MD
3 months ago / 7 min read

GLP-1 receptor agonists are commonly used in managing type 2 diabetes and supporting weight loss efforts. Medications like Liraglutide and Semaglutide are designed to imitate the effects of the natural GLP-1 hormone, which plays a role in regulating blood sugar levels and appetite. 

Even though these medications are generally considered safe and are often part of a supervised weight loss treatment plan, it's important to be aware of the potential side effects. While these side effects can vary from person to person, they may still occur.

What are the common side effects someone may experience with GLP-1 injections?

As with any medication, GLP-1 receptor agonists may come with a range of possible side effects. While many people tolerate these injections well, others might experience mild to moderate symptoms as their bodies adjust.

One of the most frequently reported side effects related to GLP-1 injections involves the gastrointestinal system. These may include nausea, vomiting, diarrhea, constipation, and abdominal pain.

  • Nausea: Some individuals report feeling nauseous, especially when starting the medication. This sensation might decrease over time as the body adapts.

  • Vomiting: In some cases, nausea may be followed by vomiting, particularly if the dosage is increased too quickly.

  • Diarrhea: Some people experience loose stools and frequent bowel movements, though this side effect tends to diminish over time.

  • Constipation: Others might experience constipation, which can sometimes be managed by increasing fiber intake and staying hydrated.

  • Abdominal pain: Some users report discomfort or pain in the stomach area, which could lessen as the body adjusts.

Injection site reactions

Since we’re discussing injections that are administered in specific areas of the skin, like the abdomen, it’s possible to experience minor reactions at the injection site. This is common with medications like some medications.

Minor reactions at the injection site can occur for some individuals, such as:

  • Redness

  • Swelling

  • Itching

These reactions are generally mild and may resolve on their own. If possible, rotating the injection site each time might help reduce the likelihood of these issues.

Low blood sugar (hypoglycemia)

GLP-1 injections on their own are not typically associated with low blood sugar, but the risk might increase if combined with other diabetes medications like insulin or sulfonylureas. Symptoms of low blood sugar can include:

  • Dizziness

  • Sweating

  • Shakiness

  • Confusion

Monitoring blood sugar levels regularly and discussing any concerns with your healthcare provider can help ensure your treatment plan is appropriate.

Less common but more serious side effects

There is also a possibility of experiencing less common but more serious side effects. While these are rare, it’s important to be aware of them when using GLP-1 injections. Two such potential side effects include pancreatitis, which is inflammation of the pancreas, and issues related to the gallbladder.

Additionally, in rare cases, some individuals may have allergic reactions to GLP-1 injections. Signs of an allergic reaction can include:

  • Rash or itching

  • Swelling of the face, lips, tongue, or throat

  • Difficulty breathing

If you experience any of these symptoms, it’s important to look for emergency medical attention immediately.

What to do if you experience side effects?

If you experience any side effects, whether mild or severe, it's important to talk to your healthcare provider. They can help determine whether the side effects are temporary or if adjustments to your treatment plan are necessary. In some cases, your provider might suggest lowering your dose, changing the timing of your injections, or considering alternative medications.

Finally, which GLP-1 medication is right for you?

GLP-1 medications have revolutionized the approach to weight loss, offering effective solutions for those struggling with obesity.

Choosing the right GLP-1 medication depends on various factors, including your weight loss goals, overall health, and personal preferences. Semaglutide and Tirzepatide may be ideal for those seeking significant weight loss, while Liraglutide and Dulaglutide provide steady and manageable reductions in weight. Exenatide is a trusted choice with a long-standing history of use.


This article is for informational purposes only and does not constitute medical advice. The information contained herein is not a substitute for and should never be relied upon for professional medical advice. Always talk to your physician about the risks and benefits of any treatment. Nu Image Medical may not offer the medications or services mentioned in this article.

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