Glucagon-like peptide-1 (GLP-1) receptor agonists, such as Ozempic, Wegovy, Mounjaro, and Rybelsus, are medications originally developed to treat type 2 diabetes but are now also widely used for weight loss. These drugs work by helping the body release insulin when needed, lowering the amount of sugar made by the liver, slowing digestion so that you feel full longer, and reducing appetite. When taken under medical supervision, they can be very effective for controlling blood sugar levels and supporting weight management. However, like any medication, GLP-1 agonists can cause side effects, and it’s important for patients to be aware of them.
The most common side effects of GLP-1 medications include nausea, vomiting, diarrhea, constipation, and stomach pain or bloating. These symptoms are often mild and tend to improve over time as the body adjusts to the medication. Eating smaller meals, avoiding greasy or spicy foods, and following your doctor’s dose adjustment schedule can help minimize these effects. However, if symptoms become severe or persistent, medical attention may be necessary.
In rare cases, GLP-1 receptor agonists can lead to serious complications. These include severe vomiting or dehydration that may result in kidney injury, low blood sugar (especially when used with insulin or sulfonylureas), pancreatitis, or very slow stomach emptying (gastroparesis), which can cause ongoing nausea and fullness. Some patients may also experience bowel obstruction or allergic reactions. If you develop severe abdominal pain, vomiting that won’t stop, or symptoms of low blood sugar such as shakiness or confusion, you should seek immediate medical care.
Certain individuals may be at higher risk of side effects. People with existing stomach or intestinal problems, those taking opioid pain medications, or patients with conditions like Parkinson’s disease or Sjögren’s syndrome may experience worsened symptoms. GLP-1 agonists can also interact with other diabetes medications, leading to dangerously low blood sugar. It’s important to tell your doctor about all medications you are taking, including those purchased online or from compounding pharmacies. Compounded versions of GLP-1 drugs are often unregulated and may contain inaccurate doses, which can increase the risk of side effects.
If you are admitted to the hospital or need surgery, always inform your healthcare team that you are taking a GLP-1 medication. In most cases, these drugs are temporarily stopped during hospitalization, which is safe and does not cause rapid weight regain. Other medications such as insulin can be used to manage blood sugar levels during this time. After discharge, your doctor will advise when to safely restart the medication. If your hospital stay was due to a GLP-1-related complication, your doctor may suggest discontinuing it permanently or pausing it until further evaluation.
Before surgery, it’s especially important for anesthesiologists and surgeons to know if you’re taking a GLP-1 agonist, since these drugs slow stomach emptying and can increase the risk of vomiting during anesthesia. Depending on your symptoms and timing of your last dose, the care team may take extra precautions to prevent aspiration or other complications.
To use GLP-1 medications safely, follow your doctor’s instructions carefully and avoid changing doses on your own. Increase doses gradually as prescribed, stay hydrated, and monitor your blood sugar regularly if you have diabetes. Notify your doctor right away if you experience severe or persistent nausea, vomiting, abdominal pain, or signs of low blood sugar. Avoid compounded or unapproved versions of GLP-1s, as their safety and dosage accuracy are not guaranteed.
GLP-1 receptor agonists can be highly beneficial for people with diabetes or obesity when used appropriately. By staying informed, communicating openly with your healthcare team, and recognizing possible side effects early, you can ensure that you use these medications safely and effectively to achieve your health goals.