GLP-1 Before Surgery or Endoscopy: What to Ask

Tell the procedure team about your GLP-1 medicine when the appointment is arranged, and ask how its instructions will be coordinated with the prescriber. We would not choose a medication pause from an old online checklist or assume that feeling well clears someone for sedation.

Why the anesthesia team needs to know

Wegovy and Zepbound prescribing information describes rare postmarketing reports of stomach contents entering the lungs during general anesthesia or deep sedation, despite reported adherence to fasting instructions. Both labels say the available data are insufficient to establish whether changing fasting instructions or temporarily stopping treatment reduces retained stomach contents. They instruct patients to tell healthcare providers before planned surgery or procedures.^{1, 2}

This concern is different from the everyday nausea and constipation covered in our side-effects evidence guide. A symptom checklist cannot substitute for the team's assessment of the planned anesthesia.

Why two offices may give different instructions

The ASA's October 2024 announcement of multisociety guidance says patients at low risk for delayed stomach emptying can continue GLP-1 treatment before elective surgery. It also calls for individual assessment, including recent treatment initiation or dose escalation, gastrointestinal symptoms and other conditions affecting stomach emptying. The team may consider dietary preparation, an adjusted anesthesia plan, stomach ultrasound or postponement. The same guidance asks clinicians to balance interruption against its metabolic consequences, including blood-glucose problems.³

A separate 2025 SPAQI consensus statement addresses medication management and fasting. Its authors explicitly note that published recommendations differ.⁴ These documents are dated clinical guidance, not interchangeable instructions for every patient. If your offices disagree, ask them to reconcile the plan before you change treatment or preparation.

Three studies measured different things

A 2024 ultrasound study enrolled 124 people who had followed fasting instructions before elective procedures. Increased stomach contents were found in 35 of 62 weekly GLP-1 users and 12 of 62 nonusers. It was an observational study of stomach contents, not a randomized test of whether a particular pause prevents aspiration.⁵

The 2026 OCULUS randomized endoscopy trial provides a different kind of evidence. In its 60-person interim analysis, after eight post-randomization exclusions, clinically significant retained contents occurred in 3.1% of the hold group and 25.0% of the continue group; the trial stopped early. All these events prevented adequate endoscopic examination. The investigators reported no aspiration events and said the study was not powered to detect uncommon safety outcomes. Participants had elective upper endoscopy under sedation or monitored anesthesia care; planned general anesthesia was excluded.⁶

A 2025 claims-based study of 366,476 surgical patients found no statistically significant adjusted association between a preoperative GLP-1 prescription and aspiration pneumonia within thirty days after surgery.⁷ That finding does not prove zero risk or settle the medication decision for a particular procedure.

Retained contents, an interrupted examination and aspiration pneumonia are different outcomes. Reading their percentages as one risk table would lose the distinctions that matter to the treating team.

Bring a short, accurate treatment history

Have the product name, route, prescribed strength and date of the last actual dose ready. Add when treatment started, any recent dose increase, current digestive symptoms, diabetes and other medicines. Describe what you took, rather than only when a prescription was issued.

Ask the procedure office who will coordinate with the prescriber and who can answer questions if the plan changes. The decision should address both the procedure and the condition being treated, rather than leave you to choose between two conflicting messages.

Ask for the plan in writing

Request instructions covering the medication, food and drink preparation, what changes to report and who will decide when treatment resumes. Follow the responsible team's directions rather than creating a longer fast or a replacement dose yourself.

If treatment is interrupted, ask specifically about restarting. Our missed-dose and restart guide explains why an ordinary late injection and a longer interruption are different questions. It cannot turn a planned clinical pause into a self-directed restart schedule.