GLP-1 Side Effects & Who Should Not Take Them
Common side effects and medical conditions that may make GLP-1 medications inappropriate.
GLP-1 medications have helped many people lose weight, but they are not appropriate for everyone. Before starting treatment, your healthcare provider will review your medical history, current medications, and potential risks.
Common Side Effects
Most patients experience mild side effects that often improve as the body adjusts:
- Nausea
- Vomiting
- Constipation
- Diarrhea
- Abdominal discomfort
- Bloating
- Heartburn
Serious side effects such as pancreatitis and gallstones are uncommon but should be discussed with your healthcare provider. Gallstones after weight loss →
Who Should Not Take GLP-1 Weight-Loss Medications?
These medications may not be recommended for patients with:
- Personal or family history of medullary thyroid carcinoma (MTC)
- Multiple Endocrine Neoplasia syndrome type 2 (MEN2)
- Serious allergic reaction to one of these medications
- Pregnancy or plans to become pregnant
Your provider may use caution if you have:
- History of pancreatitis
- Severe gastrointestinal disorders affecting stomach emptying
- Advanced kidney disease
- Active gallbladder disease
Having one of these conditions does not automatically mean you cannot take a GLP-1 medication—it requires an individualized discussion about benefits and risks.
Is Bariatric Surgery a Better Option?
For some patients, bariatric surgery may provide a more appropriate long-term treatment, particularly with severe obesity, significant obesity-related medical conditions, or inadequate weight loss with medication. The decision should be individualized after a comprehensive evaluation. Compare Ozempic® vs. bariatric surgery →