Telling your surgeon you take a GLP-1
GLP-1 medications delay stomach emptying, raising aspiration risk under anesthesia. Learn what to tell your surgical team and how modern guidance handles it.
The short answer
- Most people can continue their GLP-1 medication, but your anesthesiologist and surgeon will decide based on your specific procedure and risk factors.
- You'll typically fast from solid food for 24 hours before a procedure and may be allowed clear liquids until a certain time before surgery.
- GLP-1 medications slow stomach emptying, which means food or stomach contents move more slowly.
- Follow the specific instructions your surgical team gives you.
Why your surgeon needs to know
GLP-1 medications slow how fast your stomach empties food into your small intestine. That delay is the mechanism behind both the appetite benefit and most of the side effects. Under anesthesia, when you can’t protect your airway, stomach contents that move slowly pose a risk: they could be aspirated (inhaled) into your lungs instead of staying where they belong.
Aspiration during surgery is rare, but it’s serious. Your anesthesiologist needs to know about any factor that changes the risk calculation, and a GLP-1 medication is one of them. This is not a reason to panic or to stop your medication without guidance—it’s a reason to have the conversation before you’re on the operating table.
What the current guidance says
Until recently, some anesthesia protocols recommended stopping GLP-1 medications before surgery. That blanket approach has shifted. In October 2024, the American Society of Anesthesiologists and other medical societies updated their guidance to move away from automatic discontinuation toward individualized plans based on your specific procedure, your risk factors, and your medical history.
The new standard is: most people can continue their GLP-1 medication, but with specific fasting instructions. You’ll typically be asked to fast from solid food for 24 hours before your procedure and may be allowed clear liquids closer to the time. Some patients—those at higher risk for complications—may receive a different plan tailored to their situation. That’s between you and your surgical team.
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What you need to do before surgery
Tell your surgeon, your anesthesiologist, your endoscopist, or your dentist that you take a GLP-1 medication. Say the name (semaglutide, tirzepatide, orforglipron, or whatever you’re taking) and mention that it slows stomach emptying. You don’t need to explain the mechanism or the risk—just name it and let them ask questions.
Do this at your pre-operative visit, not the day of surgery. Write it down on any intake form. If you’re having a procedure where you won’t meet the anesthesiologist until the day of, call ahead and make sure the information is in your chart. The proceduralist may want to adjust your fasting time, your medication schedule, or your plan—and they can only do that if they know.
Do not stop your medication on your own before surgery. Your prescriber and your surgical team need to coordinate. Stopping abruptly can cause rebound effects, and stopping too early may not address the specific risk. Let them decide together.
What happens on the day of your procedure
Follow the fasting instructions you were given. If you were told to fast from solids for 24 hours and clear liquids for a certain time before the procedure, do that. If your surgical team gave you different instructions, follow those instead. The fasting window is part of how they manage the aspiration risk.
Mention the medication again to the anesthesiologist or nurse the morning of surgery, even if you already told someone else. Redundancy is safe here. If you’ve been asked to hold a dose before the procedure, take it exactly as instructed—not earlier, not later.
After the procedure, your anesthesiologist or surgeon will let you know when you can resume eating and drinking normally, and when to restart your medication if you held a dose. Follow that guidance. Your stomach is still recovering from both the anesthesia and the procedure itself.
Special situations: dental work and minor procedures
Dental work, minor dermatology procedures, and other office-based procedures under local anesthesia carry a lower aspiration risk than major surgery under general anesthesia. You still need to mention your GLP-1 medication to your dentist or proceduralist, because they should know your full medication list. Most of the time, no special precautions are needed.
If you’re having a procedure that involves sedation (sometimes called twilight sedation or conscious sedation), treat it the same way you would treat a surgery: tell the team, follow fasting instructions, and let them direct what happens next.
What not to do
Don’t stop your GLP-1 medication days or weeks before surgery on your own. Don’t assume you need to hold it without being told. Don’t skip mentioning it because you think it’s not important or because you’re embarrassed. And don’t follow fasting instructions from the internet or from friends who had a different procedure—follow the ones your surgical team gives you.
The goal is not to make your procedure more complicated. It’s to make sure your surgical team has the information they need to keep you safe. You’re not the first person they’ve managed on a GLP-1 medication, and they have protocols for this.
Your job before any procedure is to tell every surgeon, endoscopist, dentist, and anesthesiologist that you take a GLP-1 medication—and then let them decide what happens next.
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Common questions
do I need to stop my GLP-1 before surgery
Most people can continue their GLP-1 medication, but your anesthesiologist and surgeon will decide based on your specific procedure and risk factors. Do not stop it on your own—tell your surgical team first and let them coordinate with your prescriber.
how long before surgery should I stop eating
You'll typically fast from solid food for 24 hours before a procedure and may be allowed clear liquids until a certain time before surgery. Your surgical team will give you exact instructions—follow those, not general guidelines.
what is aspiration risk with GLP-1
GLP-1 medications slow stomach emptying, which means food or stomach contents move more slowly. Under anesthesia, when you can't protect your airway, slower-moving stomach contents pose a small risk of being inhaled into the lungs instead of staying in the stomach. That's why your anesthesiologist needs to know you're taking one.
can I take my GLP-1 the morning of surgery
Follow the specific instructions your surgical team gives you. Some patients are asked to hold a dose before surgery, and some are not. Ask at your pre-operative visit so you know exactly what to do the morning of your procedure.
Where this comes from
FDA prescribing information for the approved GLP-1 receptor agonists; the peer-reviewed trial literature (STEP, SURMOUNT, SELECT); and Nutritional priorities to support GLP-1 therapy for obesity, the 2025 joint advisory of the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. We use no influencer, telehealth-marketing, or supplement-industry sources.
Educational content from The Reset Series. Not medical advice, not a diagnosis, and no dosing guidance — dose decisions belong to the clinician who wrote your prescription. If you have symptoms that concern you, contact your prescriber. In an emergency, call 911. We are not affiliated with any pharmaceutical company; we sell no medications and provide no prescriptions.