GLP-1 Side Effects: What to Expect and When to Call
Most side effects of GLP-1 medications are mild gastrointestinal issues, like nausea and diarrhea, which typically peak when you start or increase your dose. However, serious risks like pancreatitis, gallbladder problems, and severe dehydration can occur. You should have regular check-ins with your physician to monitor your response to the medication and manage any side effects safely.
- Nausea, vomiting, diarrhea, constipation, and acid reflux are the most common side effects.
- These mild issues usually happen when starting the medication or moving to a higher dose.
- Rare but serious risks include pancreatitis, gallbladder disease, and kidney problems related to severe dehydration.
- GLP-1 medications carry a boxed warning about a potential risk of thyroid C-cell tumors.
- You must tell your surgeon or anesthesiologist if you take a GLP-1 before any medical procedure.
Understanding Common Gastrointestinal Side Effects
The most frequent side effects of GLP-1 receptor agonists are related to the digestive system. Medications like Wegovy and Zepbound change how quickly your stomach empties. This can cause discomfort, especially when you first start taking the medication.
Most people who experience side effects notice them early in their treatment. These symptoms also tend to appear for a few days after your physician increases your dose. For many patients, these mild side effects improve as their body adjusts to the medication.
- Nausea
- Vomiting
- Diarrhea
- Constipation
- Acid reflux or heartburn
- Stomach pain
- Feeling overly full after small meals
- Belching or gas
Managing Mild Side Effects
You can often reduce mild nausea or stomach discomfort by changing how you eat. Eating smaller meals more frequently can help your stomach process food more easily. Avoid eating very late at night, and try to stop eating before you feel completely full.
Greasy, fried, or very spicy foods are more likely to cause symptoms like heartburn or nausea when you take a GLP-1 medication. Staying hydrated is also very important, especially if you experience vomiting or diarrhea. Your physician can offer specific advice based on your symptoms.
Serious and Rare Risks to Watch For
While mild stomach issues are common, you should also be aware of rare but serious risks. Pancreatitis is an inflammation of the pancreas that can cause severe, persistent abdominal pain. This pain may radiate to your back and may happen with or without vomiting.
Gallbladder problems, including gallstones, can also occur. Symptoms might include pain in your upper stomach area, fever, or yellowing of your skin or eyes. If you develop symptoms of pancreatitis or gallbladder disease, stop taking the medication and contact your physician immediately.
Severe nausea, vomiting, or diarrhea can lead to dehydration. If you cannot keep fluids down, dehydration can cause kidney problems or kidney failure. Let your physician know if you cannot drink enough fluids.
People taking GLP-1 medications with other diabetes medications, like sulfonylureas or insulin, have a higher risk of low blood sugar (hypoglycemia). Symptoms include dizziness, sweating, confusion, and a fast heartbeat. Your physician may adjust your other diabetes medications when you start a GLP-1.
The Boxed Warning on Thyroid Tumors
All GLP-1 receptor agonists have a boxed warning from the FDA. This is the strictest warning given to prescription medications. The warning relates to a possible risk of thyroid C-cell tumors.
In studies with rats and mice, these medications caused thyroid C-cell tumors. It is not known if these medications cause these tumors, including a type of thyroid cancer called medullary thyroid carcinoma (MTC), in humans. You should not use these medications if you or your family have a history of MTC, or if you have an endocrine system condition called Multiple Endocrine Neoplasia syndrome type 2 (MEN 2).
Preparing for Surgery or Medical Procedures
Because GLP-1 medications slow down how fast your stomach empties, they can increase the risk of complications during anesthesia. Having food in your stomach during surgery can cause aspiration, where stomach contents enter your lungs.
You must tell your surgeon, anesthesiologist, and anyone else involved in a medical procedure that you take a GLP-1 medication. They will likely tell you to stop taking the medication for a specific amount of time before your procedure. Follow their instructions exactly to ensure your safety.
Medical Weight Management at Éblouissant
When considering medical weight management, proper physician supervision helps you manage side effects and monitor your overall health. At Éblouissant, Dr. Pandey evaluates your medical history and orders necessary metabolic and thyroid blood work before prescribing any medication.
An initial weight consultation with Dr. Pandey takes 30 to 45 minutes at our Greenwich Village office or through a virtual visit. If FDA-approved medications like Wegovy or Zepbound are clinically appropriate, she will monitor your progress and help you manage any side effects safely.
Common questions
How long do GLP-1 side effects usually last?
Mild gastrointestinal side effects like nausea often peak in the first few days after starting the medication or increasing the dose. For many patients, these symptoms improve within a few weeks as their body adjusts. Persistent or severe side effects require a physician's evaluation.
When should I go to the emergency room for side effects?
Seek emergency medical care if you experience severe, persistent stomach pain that will not go away, which may be a sign of pancreatitis. You should also seek immediate help for signs of a severe allergic reaction, such as swelling of your face, lips, tongue, or throat, or difficulty breathing.
Does my health insurance cover the cost of GLP-1 medications?
Coverage for medications like Wegovy or Zepbound depends entirely on your specific insurance plan. Prior authorization is often required and coverage is never guaranteed. You can call our office at Éblouissant to check your plan for primary care visits, but medication coverage requires checking with your pharmacy benefits manager.
Can I drink alcohol while taking a GLP-1?
Drinking alcohol can irritate your stomach and may worsen side effects like nausea or acid reflux. Alcohol can also increase the risk of low blood sugar if you take other diabetes medications. Discuss your alcohol use with your physician when starting a GLP-1.
Medical Weight Loss & GLP-1
See pricing, what to expect, and how to book on our Medical Weight Loss & GLP-1 page.
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This article is general information, not medical advice, and does not create a doctor-patient relationship. Individual results vary. If you have a medical emergency, call 911. Medical disclaimer