Published by Peptide Protocols · Reviewed September 2026 · How we make these pages · Educational & research purposes only — not medical advice.
Here's a question that doesn't come up until suddenly it really matters: you're scheduled for surgery — or even a colonoscopy — and you're on a GLP-1. Do you keep taking it? This one isn't wellness trivia; it's a genuine anesthesia-safety topic, so we're going to be a little more serious than usual (we'll allow ourselves exactly one joke).
In other words: the “stays full longer” feature that helps you eat less is the same feature that makes anesthesiologists want a plan. (That was not the joke. The joke is: your stomach, unlike you, did not read the pre-op fasting instructions.)
This is one of those places where a peptide/GLP-1 tracker earns its keep: knowing your exact last-dose date makes that pre-op conversation quick and accurate. That's part of what the Universal Logbook is for.
Vial mg + bacteriostatic water mL + your target mcg → mL and U-100 syringe units, instantly. Free, no sign-up, 60+ research peptides preset — plus dedicated calculators and BAC-water charts for BPC-157, retatrutide, tirzepatide, semaglutide, tesamorelin and CJC-1295/ipamorelin.
Open the free peptide calculator →Research & educational use only — never medical advice.
Almost certainly you'll need to pause it — but how long depends on the drug and procedure, and it's your anesthesia team's call. 2023 ASA guidance said hold weekly GLP-1s at least one week; newer evidence suggests longer holds (up to 14–30 days) may be safer. Disclose your use and last dose early.
GLP-1s slow stomach emptying. Under anesthesia, retained stomach contents raise the risk of aspiration — food or liquid entering the lungs — which is what pre-surgery fasting is designed to prevent.
Yes — procedures using sedation carry the same aspiration concern, so the same disclose-and-plan rule applies, not just major surgery.
Tell your surgeon and anesthesiologist that you take a GLP-1 and exactly when your last dose was, at the pre-op appointment. Don't decide the timing yourself.
The Universal Logbook and reconstitution tools keep your notes clean and the math done for you across any compound you study.
Browse the shop on Etsy →We do not recommend or partner with any peptide supplier. Use the checklist instead: third-party COAs that match your batch and lot, stated purity, clear research-use labeling, real support and proper cold-chain shipping.
The supplier checklist →Educational content only. Confirm the legal status where you live before ordering anything.
The one formula, a BAC-water chart, and the 10 most-researched beginner peptides — the math done for you. Print it for the fridge.
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