Medications · GLP-1
Ozempic & GLP-1 Medications Before Surgery
Ozempic, Wegovy, Mounjaro and similar drugs slow how fast your stomach empties — which matters a lot for anesthesia. Here's what the latest guidance says, without the jargon.
This is a fast-changing area
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Which drugs are we talking about?
GLP-1 receptor agonists are used for type 2 diabetes and weight loss. The common ones include:
- Semaglutide — Ozempic, Wegovy, Rybelsus
- Tirzepatide — Mounjaro, Zepbound
- Dulaglutide — Trulicity
- Liraglutide — Victoza, Saxenda
The simple reason they matter
These medications work partly by slowing how quickly your stomach empties. That's helpful for blood sugar and appetite — but before anesthesia it's a problem. If food lingers in your stomach, there's more to come back up and be breathed into your lungs while you're sedated. That complication, aspiration, is exactly what pre-surgery fasting is designed to prevent.
How long to stop — the current approach
| Situation | Common guidance |
|---|---|
| Most patients, elective surgery | Often continue — no routine stop. Tell your team. |
| Higher-risk (nausea, dose-increase phase, GI symptoms) | Individualized — e.g. a 24-hour clear-liquid diet, or holding a weekly dose |
Older advice to "stop 1–2 weeks before" is no longer a blanket rule — newer multi-society guidance is individualized.
The 2024 update
What you should actually do
- Tell your surgical team you take a GLP-1 medication — by name and dose — as early as possible.
- Ask for a specific instruction: hold it, continue it, or switch to clear liquids for 24 hours.
- Don't stop diabetes medication on your own without a plan for your blood sugar.
- Follow your fasting times as usual on top of any GLP-1 instruction.
Not sure when to stop eating and drinking? Use the fasting calculator to get your exact cut-off times.
Frequently asked questions
How long before surgery should I stop Ozempic?
There is no single 'stop X days' rule anymore. Current multi-society guidance says many patients can continue their GLP-1 before elective surgery, with higher-risk patients managed individually (for example a 24-hour clear-liquid diet, or holding a weekly dose). Tell your team you take it and follow their specific advice.
Why does Ozempic matter for anesthesia?
GLP-1 medications slow gastric emptying, meaning food can stay in your stomach longer than normal. Under anesthesia that raises the risk of stomach contents coming up and entering the lungs (aspiration).
Do I have to stop my GLP-1 at all?
Not always. Updated multi-society guidance in 2024 says many patients can continue their GLP-1 and instead follow a clear-liquid diet for 24 hours before the procedure. Patients at higher risk of stomach problems may be told to hold the dose. Your team decides based on your situation.
Does this apply to Mounjaro and Zepbound too?
Yes. The same gastric-emptying concern applies to tirzepatide (Mounjaro, Zepbound) and other GLP-1 / GIP medications, not just semaglutide (Ozempic, Wegovy).