GLP-1 drugs and surgery: what plastic surgeons actually know

What did @drkellythornbury actually say?

The creator, identifying as a plastic surgeon, says patients should stop Ozempic, Mounjaro, and similar GLP-1 drugs "four weeks before" surgery. The reason given is that these medications slow gastric emptying, which raises the risk of reflux during anesthesia. That's the core claim, and it's worth unpacking carefully.

To be fair, the creator is responding to something real. In 2023, anesthesiology societies did issue updated guidance on GLP-1 receptor agonists and perioperative risk. The concern about delayed gastric emptying is legitimate clinical territory. But the four-week figure the creator presents as settled fact is actually more contested than this video suggests, and the explanation glosses over some important nuance that patients deserve to hear.

Does the science back this up?

Partially, but not as cleanly as this video implies. The American Society of Anesthesiologists (ASA) issued guidance in June 2023 recommending that patients on daily GLP-1 drugs hold the dose the day of surgery, and that weekly injectables like semaglutide be stopped one week before elective procedures. That's one week, not four.

The four-week figure appears in more conservative institutional protocols and has been referenced in some surgical society guidance, but it is not the universal standard the video implies. A review by Silveira and colleagues (2023, Obesity Surgery) noted that evidence for a specific washout period remains limited and largely extrapolated from pharmacokinetic data rather than randomized trials. Semaglutide's half-life is roughly one week, which is why the ASA landed on a one-week hold for weekly dosing. Four weeks is more cautious, not necessarily more evidence-based.

The reflux and aspiration risk during anesthesia is real. Intraoperative pulmonary aspiration from retained gastric contents is a documented complication, and case reports have linked GLP-1 use to unexpected full stomachs even after appropriate fasting (Lam et al., 2023, Canadian Journal of Anesthesia).

What did they get wrong (or right)?

The creator gets the mechanism right. GLP-1 receptor agonists do slow gastric motility, and that does create anesthetic risk. That part holds up. The claim that these drugs are used by both diabetic patients and people pursuing weight loss is also accurate and worth saying out loud, since many providers still think of this only as a diabetes drug class.

Where this video falls short is presenting "four weeks" as the official guideline when the ASA's actual published guidance says one week for weekly injectables. The creator never distinguishes between daily and weekly formulations, which matter because their pharmacokinetics differ significantly. Liraglutide, a daily drug, clears the system faster than semaglutide. Treating them identically in a patient communication is sloppy, and for a surgeon giving advice to tens of thousands of viewers, that matters.

The video also never mentions that guidelines vary by surgical context. A four-week hold might be reasonable for elective cosmetic procedures where there is more scheduling flexibility, but presenting it as the universal rule overstates the consensus.

What should you actually know?

If you are on a GLP-1 medication and have surgery coming up, do not adjust your dose based on a TikTok video, including this one. Talk to your prescriber and your anesthesiologist. The ASA's 2023 guidance recommends one week off for weekly injectables before elective surgery, but your surgical team may apply a longer hold depending on your procedure, your history, and your risk profile.

The aspiration concern is real enough that you should take it seriously. If you show up to a pre-op appointment on a GLP-1 and nobody asks about it, bring it up yourself. Some anesthesiologists now use point-of-care gastric ultrasound to check stomach contents in patients with GLP-1 exposure, which is a reasonable precaution (Perlas et al., 2022, Anesthesiology).

For patients managing type 2 diabetes with these medications, stopping abruptly also has metabolic implications. That conversation needs to involve whoever manages your diabetes, not just your surgeon. This video does not mention that at all, which is a real gap.