GLP-1 Before Surgery: Anesthesia Risks and Guidance

Last updated October 20, 2026

Short answer: GLP-1 medications slow stomach emptying, and there have been rare reports of stomach contents entering the lungs during anesthesia or deep sedation even after fasting. All four labels tell you to tell your care team before any planned procedure. Under October 2024 guidance from five medical societies, most people can keep taking their medication, higher-risk patients may need a 24-hour liquid diet first, and elective surgery may be postponed during dose increases. Do not stop or change your dose on your own.

What the labels say

The Wegovy, Ozempic, Zepbound and Mounjaro labels all carry the same warning. The medications delay gastric emptying, and there have been rare postmarketing reports of pulmonary aspiration (stomach contents entering the lungs) in people having elective surgery or procedures needing general anesthesia or deep sedation. In those reports the person still had food or liquid in the stomach despite following the fasting instructions.

The labels also say available data are insufficient to recommend how to reduce the risk, including whether changing fasting instructions or temporarily stopping the medication would help. What they do say is to tell your healthcare providers before any planned surgery or procedure if you take the medication.

What the 2024 multi-society guidance says

In October 2024, the American Society of Anesthesiologists, the American Gastroenterological Association, the American Society for Metabolic and Bariatric Surgery, the International Society of Perioperative Care of Patients with Obesity and the Society of American Gastrointestinal and Endoscopic Surgeons issued joint guidance. As described by the ASA:

The guidance lists people at higher risk as those still increasing their dose, those with stomach symptoms, those on higher doses, and people with other conditions that slow stomach emptying, such as Parkinson's disease.

What to do before a procedure

• Tell the surgeon, the anesthesiologist and your prescriber that you take a GLP-1, which brand, your dose, and when your last dose was.
• Say if you recently increased your dose or have nausea, vomiting, belly pain or constipation.
• Follow the instructions your team gives you for eating and drinking. Do not stop the medication or change your dose on your own, since the right plan depends on your health and procedure.
• Ask what to do if you are in the middle of dose increases and the procedure is not urgent.

The labels refer to surgeries and to procedures requiring general anesthesia or deep sedation, so this is not limited to surgery. Because guidance can change as new evidence arrives, check with your care team for their current protocol.

Related: side effects overview, nausea and eating tips and the missed dose rules.