GLP-1 Before Surgery: What Your Anesthesia Team Needs to Know

If you take a GLP-1 medicine such as Ozempic, Wegovy, Mounjaro or Zepbound and have surgery coming up, the current answer is that most people can keep taking it, but your anesthesia team has to decide, and it needs details from you early. The reason is your stomach: these medicines slow gastric emptying, and a stomach that still has food in it under anesthesia carries a small but serious risk called aspiration.

You may have seen "stop it a week before" online. That advice came from 2023 and has since changed. Here's what changed, why the team cares, and what to tell them.

Why does the anesthesia team care about my GLP-1?

During general anesthesia or deep sedation, the reflexes that normally stop stomach contents from going into your lungs are switched off. Fasting before surgery exists to empty the stomach so there's nothing to come back up. If something does get into the airway, it's called pulmonary aspiration, and it can cause pneumonia or worse.

GLP-1 medicines slow how fast food leaves the stomach. That's part of why you feel full sooner. It also means the usual fasting window may not fully empty the stomach for some people.

This is in the official labels now. The Zepbound prescribing information, for example, has a warning section titled "Pulmonary Aspiration During General Anesthesia or Deep Sedation." It says there have been rare postmarketing reports of aspiration in people taking GLP-1 receptor agonists, including people who followed the usual fasting instructions and still had food in their stomach. It also says the available data aren't enough to tell whether changing fasting rules or pausing the drug lowers the risk. The FDA added this class-wide warning to GLP-1 labels in late 2024. The label also tells prescribers to have patients tell their healthcare providers before any planned surgery or procedure.

So the team isn't being nosy. Your answer helps them choose how to keep your airway safe.

Should I stop my GLP-1 before surgery? What the guidance says now

Guidance has moved quickly, which explains why the internet contradicts itself.

When	Who	Headline
June 2023	American Society of Anesthesiologists (ASA)	Hold daily GLP-1s on the day of surgery and weekly ones for a week before. The ASA said this was based on very limited evidence, mostly case reports.
Oct 29, 2024	ASA, AGA, ASMBS, ISPCOP and SAGES (multi-society guidance)	Most patients can continue their GLP-1 before elective surgery and endoscopy. Assess each person's risk instead of applying one rule to everyone.
2025	SPAQI consensus (British Journal of Anaesthesia)	Continue GLP-1s in patients without significant GI symptoms. Advises a 24-hour clear-liquid period before anesthesia.

The 2024 multi-society guidance, published in Clinical Gastroenterology and Hepatology, groups the people who might need a different plan:

• People in the escalation phase. That means early in treatment or soon after a dose increase, which the ASA says typically lasts four to eight weeks. GI side effects are most common then.
• People with GI symptoms right now, such as nausea, vomiting, abdominal pain, bloating or constipation.
• People on higher doses.
• People with other conditions that slow the stomach, such as Parkinson's disease or gastroparesis.

For higher-risk patients, options in the guidance include a liquid-only diet for 24 hours before the procedure, a quick point-of-care stomach ultrasound before anesthesia to see whether the stomach is empty, a different anesthesia technique, or occasionally postponing elective surgery until side effects settle. Stopping the medicine is still an option for some people. The team weighs that against what stopping costs, such as higher blood sugar if you have diabetes.

One more line from the ASA's announcement: the guidance warns that holding GLP-1s only because a patient has obesity could be biased and should be avoided. The decision is supposed to be about your stomach, not your size.

None of this is a schedule to follow on your own. Your hospital may use its own protocol, and the plan depends on the procedure, the type of anesthesia and your health history.

What should I tell my anesthesia team about my GLP-1?

Picture the pre-op phone call. A nurse asks, "Any medications?" You list your blood pressure pill and forget the weekly pen in the fridge because it doesn't feel like a daily medicine. That's how this information gets missed.

Have these answers ready:

1. The exact product and strength, for example "Zepbound 7.5 mg weekly pen" or "Rybelsus 14 mg daily tablet." Read it off the pharmacy label. If it's compounded, say so.
2. Why you take it: type 2 diabetes, weight management, sleep apnea, heart risk.
3. The date of your last dose, and which day you normally take it.
4. Whether you started recently or had a dose increase in the past couple of months.
5. Current symptoms, such as nausea, vomiting, reflux, bloating, constipation or feeling full for a long time after small meals.
6. Other diabetes medicines, especially insulin or sulfonylureas, because fasting changes how those behave.
7. Any past anesthesia problems.

If you want it all on one page, our printable pre-op medication note turns this list into a fill-in template.

When to bring it up (hint: earlier than you think)

Tell the surgeon's office when the surgery is booked. Then repeat it at the pre-anesthesia visit or call. If the guidance points to a 24-hour liquid diet, a stomach ultrasound or a talk with your prescriber, that needs days of notice, not minutes.

Then ask for written instructions: what to eat and drink and when, what to do with the GLP-1, and what to do with any diabetes medicines. If your prescriber and your surgical team say different things, ask them to talk to each other. Don't just pick the easier answer.

Also ask: "Who do I call if I start vomiting or feel unwell before the surgery date?" New GI symptoms in the days before an operation are exactly what the guidance flags.

What about after surgery?

The SPAQI consensus says people who paused can restart once they're back to their usual diet. Restarting after a gap isn't always as simple as taking the old dose again, though. Depending on how long you stopped, the label may tell your prescriber to restart at a lower step. Our post on restarting a GLP-1 after a break explains why. Get the restart plan in writing before you go home.

If you track your shots in an app like GLPily, your shot log already shows the date of your last dose and any recent dose changes, so you can answer the pre-op questions in a few seconds.

Common questions

Do I have to stop Ozempic or Wegovy a week before surgery?

Not automatically. The one-week hold came from the 2023 ASA guidance. The October 2024 multi-society guidance says most patients can continue, and it reserves changes such as a liquid diet, an ultrasound check or holding the drug for people at higher risk. Your surgical and anesthesia team decides.

Why is food still in my stomach if I fasted?

GLP-1 medicines slow gastric emptying. FDA-approved labels note rare reports of aspiration in people who followed standard fasting rules and still had food in their stomach. That's why the team may ask for a longer liquid-only period.

Does this apply to sedation for smaller procedures too?

The label warning covers general anesthesia and deep sedation, and the 2024 guidance includes endoscopy. For colonoscopy and upper endoscopy specifically, see our guide to GLP-1s before a colonoscopy or endoscopy.

What if I forget and take my dose the day before?

Tell the team as soon as you realize. Don't try to make up for it by fasting longer or skipping meals on your own. They'll decide whether the plan needs to change.