April 21, 2025

What to Consider Before Starting GLP-1 Agonist Medications for Weight Loss

Medications like Ozempic (semaglutide), Wegovy, Mounjaro (tirzepatide), and Zepbound have gained popularity for their effectiveness in supporting weight loss. These GLP-1 Agonist Medications for Weight Loss work by regulating blood sugar and helping to reduce appetite. However, these medications come with important safety considerations that need to be evaluated before starting treatment.

If you’re thinking about using a GLP-1 agonist for weight loss, it’s essential to weigh the benefits against potential risks based on your personal medical history and lifestyle. Below are key factors to review before initiating therapy.

1. Contraindications: Who Should Avoid GLP-1 Agonists

Not everyone is a candidate for GLP-1 agonist therapy. Individuals with a personal or family history of medullary thyroid cancer or multiple endocrine neoplasia type 2 (MEN 2A or 2B) should avoid these medications.

Pregnant individuals and those with known hypersensitivity to GLP-1 agonists are also advised against using them.

2. Gastrointestinal Side Effects

Common side effects include nausea, vomiting, bloating, and constipation. These symptoms often occur during the initial weeks of treatment but can persist or become severe in some patients.

People with pre-existing gastrointestinal disorders like gastroparesis or inflammatory bowel disease (IBD) should not take GLP-1 agonists, as the medications may worsen their symptoms.

3. Risk of Pancreatitis

There is a known association between GLP-1 agonists and pancreatitis, including severe forms such as hemorrhagic or necrotizing pancreatitis. Patients with a history of pancreatitis are advised to avoid these drugs.

If symptoms such as severe abdominal pain develop, immediate medical evaluation is necessary, and the medication should be discontinued if pancreatitis is confirmed.

4. Thyroid Health Considerations

Animal studies have shown that GLP-1 agonists may cause thyroid C-cell hyperplasia and tumors. While human data is limited, this risk should be considered, especially in those with thyroid abnormalities or a family history of thyroid disease.

Patients should report any neck swelling, hoarseness, or trouble swallowing, as these could be signs of thyroid complications.

5. Kidney Function Matters

Severe renal impairment may increase the risk of adverse reactions. Dehydration caused by gastrointestinal side effects can worsen kidney function.

Those with compromised kidney health should consult with their healthcare provider before starting a GLP-1 agonist.

6. Drug Interactions and Absorption Issues

GLP-1 agonists delay gastric emptying, which may affect how other medications are absorbed—particularly those with a narrow therapeutic index like warfarin.

Monitoring INR levels and adjusting insulin or sulfonylurea doses may be necessary when these drugs are used together.

7. Special Considerations for Surgery and Procedures

Before undergoing elective procedures, it’s important to evaluate the risk of aspiration due to delayed gastric emptying. A temporary pause in treatment may be needed.

Some clinicians recommend a liquid diet for 24 hours before surgery and using point-of-care ultrasound to assess stomach contents.

8. Ongoing Monitoring and Follow-Up

Patients should have their hemoglobin A1c, blood glucose levels, and any signs of pancreatitis or other adverse effects monitored regularly. Treatment plans may need to be adjusted based on patient response and side effects.

Patient education is critical—knowing what symptoms to watch for and when to seek help can improve safety and outcomes.

9. Tailored to the Individual

No two patients are alike. Decisions about GLP-1 agonist therapy should be personalized, taking into account individual risk factors, preferences, and goals.

This individualized approach helps maximize the benefits of weight loss while minimizing the risks associated with these medications.

Conclusion

GLP-1 receptor agonists can be powerful tools in weight loss and metabolic health, but they are not a one-size-fits-all solution. Understanding the potential risks and carefully evaluating your medical history are crucial steps before beginning treatment.

By working closely with a qualified healthcare provider like Alabaster Healthcare, you can determine if a GLP-1 agonist is appropriate for you and develop a plan that supports both safety and long-term success.

References 

Collins L, Costello RA. Glucagon-Like Peptide-1 Receptor Agonists. [Updated 2024 Feb 29]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2024 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK551568/

Triplitt C, Solis-Herrera C. GLP-1 Receptor Agonists: Practical Considerations for Clinical Practice. Diabetes Educ. 2015 Dec;41(1 Suppl):32S-46S. doi: 10.1177/0145721715607981. Epub 2015 Oct 8. PMID: 26450217.

Sodhi M, Rezaeianzadeh R, Kezouh A, Etminan M. Risk of Gastrointestinal Adverse Events Associated With Glucagon-Like Peptide-1 Receptor Agonists for Weight Loss. JAMA. 2023;330(18):1795–1797. doi:10.1001/jama.2023.19574

Disclaimer: This article is for informational purposes only and does not replace professional medical advice. Always consult a qualified healthcare provider before making health decisions.

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