GLP-1s before surgery: why anesthesia teams ask, and what to do

Why anesthesia cares about your GLP-1

Sedation and general anesthesia suppress the reflexes that keep stomach contents out of your lungs, which is why you fast before procedures. GLP-1s slow gastric emptying, so the standard fasting clock may overstate how empty the stomach actually is. Case reports of retained food despite proper fasting put the issue on anesthesiology's radar, and screening questions followed everywhere.

The absolute risk appears low, and it is exactly the kind of low-probability, high-consequence risk procedural medicine takes seriously. Hence the protocols.

What the guidance actually says now

The first wave of guidance (2023) was simple: hold the day-of dose for daily GLP-1s, hold a week for weeklies before elective procedures. Experience and data since then pushed toward nuance: updated multi-society guidance (2024 onward) moved away from blanket holds, favoring individualized plans that often continue the medication and manage the stomach instead, commonly with a clear-liquid-only diet for the 24 hours before, and point-of-care gastric ultrasound where teams want certainty. Escalation phases and strong GI symptoms push plans toward more caution; stable maintenance dosing with no symptoms pushes toward less.

Translation: there is no single rule anymore, and that is fine, because the decision was never yours to optimize. It belongs to the anesthesia and procedure team, applied to your case.

Your actual checklist

• Disclose early, every time: surgeon, anesthesiologist, endoscopist, dentist doing sedation, all of them, at scheduling rather than in pre-op. GLP-1s do not always appear in medication reconciliations if you got them via telehealth; volunteer it.
• Bring the specifics: which medication, dose, your dose day, and where you are in titration. A dose log answers this in one glance.
• Follow their instructions exactly: whether that is holding a dose, a clear-liquid day, or standard fasting. If instructions seem to conflict between teams, ask them to reconcile rather than choosing yourself.
• Flag active symptoms: current nausea, vomiting, or feeling full quickly are exactly what the team wants to know the week of.
• Plan the restart: ask when to resume dosing after the procedure, especially if a hold interrupts your schedule (the missed dose post covers the pharmacology of gaps).

Emergency procedures

No planning applies when surgery cannot wait: anesthesia teams handle full-stomach situations routinely with techniques built for exactly that (rapid sequence induction among them). Your contribution is the same disclosure, faster: the medication, the dose, and when you last took it. A dose log in DoseLog means that answer is accurate even when you are stressed, which is precisely when memory is not.