Side Effects of GLP-1 Receptor Agonists: What Patients Should Know

Weight Loss

Nov 10

GLP-1 receptor agonists are prescription medications used for certain medical conditions, including type 2 diabetes and, for specific FDA-approved products and eligible patients, chronic weight management.

Medications that act on GLP-1 pathways can affect appetite, digestion, and blood-sugar regulation. Like all prescription medications, however, they can also cause side effects and are not appropriate for everyone.

If you're considering or currently using a GLP-1 or GIP/GLP-1 medication, understanding potential side effects—and knowing when to contact your healthcare professional—is an important part of treatment.

At OTR Health & Wellness, medication decisions are individualized based on the patient's health history, clinical evaluation, potential risks and benefits, treatment goals, and other relevant factors.

Common Side Effects

The side effects associated with a particular medication depend on the specific product, dose, patient, and other individual factors.

Gastrointestinal symptoms are among the commonly reported side effects of certain GLP-1 and GIP/GLP-1 medications.

These may include:

Nausea

Some patients experience nausea, particularly when beginning treatment or following a change in dose.

If nausea is persistent, severe, prevents you from eating or drinking adequately, or concerns you for any reason, contact your healthcare professional.

Vomiting

Vomiting can occur with some medications in this class.

Repeated or severe vomiting can contribute to dehydration and may require medical attention. Contact your healthcare professional if vomiting is persistent or significant.

Diarrhea

Changes in bowel habits, including diarrhea, may occur during treatment.

Persistent or severe diarrhea can lead to dehydration or other complications and should be discussed with your healthcare professional.

Constipation

Some patients experience constipation.

If constipation becomes persistent, severe, painful, or is accompanied by other concerning symptoms, contact your healthcare professional for guidance.

Changes in Appetite

Certain medications used for chronic weight management can affect appetite.

Patients should still pay attention to appropriate nutrition and hydration during treatment. Significant difficulty eating, persistent gastrointestinal symptoms, or other concerns should be discussed with your healthcare professional.

Other Side Effects Can Occur

Not every patient experiences the same side effects, and this article is not intended to provide a complete list.

The risks, warnings, contraindications, and side effects associated with one medication may also differ from those associated with another.

Before beginning treatment, review the prescribing information provided with your medication and discuss relevant risks with your healthcare professional and pharmacist.

Serious Symptoms Require Attention

Certain prescription weight-management and diabetes medications can be associated with potentially serious adverse effects.

Depending on the specific medication, important risks or warnings may involve conditions affecting the pancreas, gallbladder, kidneys, gastrointestinal system, or other areas of health.

Some medications also carry specific boxed warnings, contraindications, or precautions that may be particularly important based on a patient's personal or family medical history.

Because these risks differ by medication, patients should not rely on a general website article as a substitute for the prescribing information and individualized medical guidance applicable to their specific prescription.

Contact your healthcare professional promptly if you develop severe, persistent, unusual, or concerning symptoms.

If you believe you are experiencing a medical emergency or a severe or life-threatening reaction, call 911 or seek immediate emergency medical attention.

What Should You Do if You're Experiencing Side Effects?

Don't assume that you simply have to “push through” medication side effects.

Contact your prescribing healthcare professional if you're having difficulty tolerating treatment.

Depending on your symptoms and circumstances, your provider may evaluate factors such as:

The medication you're taking
Your current dose and dosing schedule
When your symptoms began
Other medications or supplements you use
Nutrition and hydration
Relevant medical conditions
Whether additional evaluation is needed
Whether your treatment plan should be modified

Do not change your dose, stop treatment, restart treatment, or alter the way you use a prescription medication without appropriate medical guidance.

Nutrition & Hydration During Treatment

Changes in appetite or gastrointestinal symptoms can sometimes make normal eating and drinking more difficult.

Patients should discuss individualized nutrition and hydration recommendations with their healthcare professional, particularly when experiencing significant nausea, vomiting, diarrhea, constipation, reduced food intake, or other gastrointestinal concerns.

There isn't one dietary strategy that is appropriate for every patient.

Your healthcare professional can help you determine whether changes to your eating pattern, hydration, medication regimen, or treatment plan should be considered.

Keep Your Healthcare Team Informed

Follow-up care is an important part of prescription weight-management treatment.

Tell your healthcare professional about:

New or worsening symptoms
Significant gastrointestinal side effects
Difficulty maintaining adequate nutrition or hydration
Changes in your health
New medications or supplements
Pregnancy or plans for pregnancy when applicable
Significant changes in weight or appetite
Concerns about your medication or dose

Providing complete and accurate information helps your healthcare professional evaluate whether your current treatment remains appropriate.

FDA-Approved and Compounded Medications Are Not the Same

This distinction is especially important when discussing GLP-1 and GIP/GLP-1 medications.

Specific FDA-approved prescription products containing active ingredients such as semaglutide or tirzepatide have been evaluated by the FDA for particular indications and under specific labeling.

A compounded preparation containing semaglutide or tirzepatide is not the same product as an FDA-approved medication containing that active ingredient.

Compounded medications are not FDA-approved, and the FDA does not review compounded medications for safety, effectiveness, or quality before they are marketed.

Compounded medications should not be described or interpreted as generic versions of FDA-approved brand-name medications.

When permitted by applicable law, a licensed healthcare professional may prescribe a patient-specific compounded medication when determined to be clinically appropriate.

Should Side Effects Stop You From Considering Treatment?

The possibility of side effects doesn't automatically mean that a medication is inappropriate for you.

It does mean that the decision should be individualized.

Your healthcare professional can help you weigh potential benefits against potential risks based on your health history, treatment goals, other medications, contraindications, and individual circumstances.

For some patients, a particular medication may be appropriate. For others, a different medication, non-medication approach, additional evaluation, or another treatment strategy may make more sense.

The goal isn't to choose a medication because it's popular or because someone else had success with it.

The goal is to determine what is medically appropriate for you.

Have Questions About Medical Weight Management?

If you're considering medically supervised weight management or have questions about your current treatment, OTR Health & Wellness can help you discuss your options.

Treatment begins with an appropriate clinical evaluation. Prescription medication is provided only when determined to be medically appropriate by a licensed healthcare professional.

Requesting a particular medication does not guarantee that it will be prescribed.

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Important Medication Information

This article is provided for general educational purposes and is not a substitute for individualized medical advice, diagnosis, treatment, medication labeling, or guidance from your healthcare professional or pharmacist.
Side effects, contraindications, warnings, and risks differ among medications. Patients should review the prescribing information applicable to their specific medication and discuss questions or concerns with an appropriate healthcare professional.
Prescription medications are available only when prescribed by a licensed healthcare professional following an appropriate clinical evaluation.
Compounded medications are not FDA-approved and have not been reviewed by the FDA for safety, effectiveness, or quality. Compounded medications are not the same as FDA-approved brand-name or generic medications.
Individual treatment responses and side effects vary.
Do not start, stop, restart, change the dose of, or otherwise alter prescription treatment without appropriate medical guidance.
If you are experiencing a medical emergency or believe you are having a severe or life-threatening reaction, call 911 or seek immediate emergency medical attention.