Written by Dr. Ashutosh A Shah, M.B.B.S., M.S., M.Ch., D.N.B., Board Certified Plastic Surgeon. Reg. no. [REG NO]. 22+ years in plastic and reconstructive surgery.
Medically reviewed by Dr. Ashutosh A Shah · Published 1 October 2026 · Last reviewed 1 October 2026
Under the 2024 multi-society guidance led by the American Society of Anesthesiologists, most patients can continue GLP-1 drugs such as Mounjaro or Ozempic before elective surgery. Those in the dose-escalation phase, on high doses or with nausea, vomiting or bloating face higher aspiration risk and may need a 24-hour liquid diet or postponement.
If you have been told to stop your injection a week before your operation, that instruction comes from guidance that has since been revised. Here is what changed, and what it means for a tummy tuck or body lift date.
Why do GLP-1 drugs matter to the anaesthetist?
Because they slow the stomach down, and an anaesthetist needs to know whether your stomach is empty before you go to sleep.
The American Society of Anesthesiologists put the mechanism plainly: "the delay in stomach emptying could be associated with an increased risk of regurgitation and aspiration of food into the airways and lungs during general anesthesia and deep sedation."
Two things there are worth noticing. The concern is aspiration, which makes this an anaesthetic question rather than a surgical one. And it is specified for general anaesthesia and deep sedation, which matters later on this page.
One point on which drug you are actually taking. The guidance is written for glucagon-like peptide-1 receptor agonists, and the drugs it names are Ozempic and Wegovy (semaglutide), Saxenda (liraglutide) and Trulicity (dulaglutide). Mounjaro is tirzepatide, which acts on a second receptor as well, and it is not among the drugs named in the societies' published release. An anaesthetist will want to know about it for the same reason, but that is their clinical judgement rather than something the published guidance states, so tell them exactly what you are on.
What did the 2024 multi-society guidance change from the 2023 advice?
It reversed the default. The old advice was to hold the drug. The current advice is that most people should keep taking it.
These are the two positions, both from the same society, side by side.
June 2023: "Hold GLP-1 agonists a week prior to the procedure/surgery for patients who take the medication weekly." For daily dosing, "Hold GLP-1 agonists on the day of the procedure/surgery".
October 2024, from the guidance issued by five societies together: "Most patients should continue taking their glucagon-like peptide-1 (GLP-1) receptor agonists before elective surgery."
The 2024 document was produced by the American Society of Anesthesiologists with the American Gastroenterological Association, the American Society for Metabolic and Bariatric Surgery, the International Society of Perioperative Care of Patients with Obesity, and the Society of American Gastrointestinal and Endoscopic Surgeons.
The 2023 advice was not wrong at the time. It was cautious and applied to everyone, and it has been replaced by an approach that sorts patients by risk. A clinic still telling you to stop a week before is quoting a position that was superseded in October 2024.
There is also a reason not to stop casually, which the older blanket advice obscured. The societies note the "risk that stopping the GLP-1 drug may have on the condition being addressed by the GLP-1 drug", and the risk of "other negative side effects such as impacting blood sugar levels". Stopping is not a free action.
Who should postpone body contouring surgery? What a tummy tuck surgeon in Adajan Surat checks before confirming a date
The clearest rule in the guidance is about the escalation phase, and it is unambiguous: "Elective surgery should be deferred and only proceed once the escalation phase has passed."
Escalation means you are still stepping the dose up. Maintenance means you have been on the same dose for a while. That distinction decides more than anything else here.
The separate rule is for gastrointestinal symptoms. The societies name "nausea, vomiting, abdominal pain, shortness of breath or constipation", and patients at highest risk of significant GI side effects are directed to the liquid diet rather than to deferral.
| Drug and dose | Phase | GI symptoms in last week | Plan | Who signs off |
|---|---|---|---|---|
| Any GLP-1 drug, stable dose | Maintenance | None | Continue. "Most patients should continue." | Surgeon and anaesthetist, prescriber informed |
| Any GLP-1 drug, stable dose | Maintenance | Nausea, vomiting, abdominal pain, breathlessness or constipation | Liquid diet for 24 hours before the procedure | Anaesthetist decides, surgeon and prescriber agree |
| Any GLP-1 drug, dose still increasing | Escalation | With or without symptoms | Defer. "Only proceed once the escalation phase has passed." | Anaesthetist and surgeon, with the prescriber on timing |
| High dose, or recent dose change | Either | Any | Individual assessment. Higher dose is listed among the higher-risk features. | All three, at the pre-anaesthetic review |
| Tirzepatide (Mounjaro) | Either | Any | Declare it. It is not named in the published release, so the anaesthetist applies judgement. | Anaesthetist, explicitly |
Weight stability matters separately from all of this, and is covered in our page on weight stability before contouring. The drug review sits inside the wider surgery readiness assessment.
What does the 24-hour liquid diet involve?
The guidance sets the duration, not the menu. It says that patients "at the highest risk for significant gastrointestinal (GI) side effects should follow a liquid diet for 24 hours before the procedure", and it does not publish a list of permitted liquids.
So this page will not give you one. The contents come from the team looking after you, since they depend on your diabetes treatment, your kidney function and what else you take. Ask for it in writing, and ask these five things:
- What counts as a liquid here, and does that include milk, dairy and soups?
- When exactly does the 24 hours start, by clock time?
- What should I do about my diabetes medicines during those 24 hours?
- How much should I be drinking, and what if I feel faint?
- What if I vomit, or still feel full, on the morning of surgery?
The most important thing about the liquid diet is what it is not. It does not replace your normal preoperative fasting instructions. The fasting window before anaesthesia still applies, it is set by your anaesthetist, and it is separate from this. Reading "liquids for 24 hours" as permission to drink up to the moment you go to theatre would be a dangerous misunderstanding, and it is the commonest one. Nutritional preparation more generally runs through our pre-surgery nutritional clearance.
Who decides, and how is it coordinated with your prescribing doctor?
Three people, and the guidance names all three: "Patients should work with their health care team, i.e., their anesthesiologist, surgeon and prescribing care team, to determine if adjustments can be made."
That sentence is the reason this page gives you no instruction about your injection. Nobody should change a prescribed drug on the basis of a blog, including this one, and nobody who has not examined you can tell you which column of the table above you are in.
How it works in practice here. Dr. Ashutosh A Shah supervises the surgical side and the body contouring plan. The anaesthetist makes the aspiration risk decision, because it is theirs to make. Your prescribing doctor is asked about the dose history, which phase you are in and whether a pause is safe for the condition the drug is treating. The three positions are reconciled before a date is confirmed rather than on the morning. Ongoing dose and symptom tracking sits with GLP-1 monitoring.
Bring the drug name and current dose, the date of every dose increase, whether you have had any of the five symptoms in the last week, and your prescriber's contact details. In our practice the single thing that most often moves a surgical date is a dose that went up three weeks ago and was not mentioned.
Next step
If you are on one of these drugs and thinking about a tummy tuck or body lift, settle the drug question first and the surgical date second. Bring your dose history, and expect the plan to be agreed with your anaesthetist and prescriber rather than decided in the room.
This page is for education and is not a substitute for assessment. Do not start, stop, pause or change the dose of any prescribed medicine for surgery without the doctor who prescribes it and the anaesthetist looking after you. No dose, no holding schedule and no fasting times are given here deliberately, because those are individual instructions and this page cannot know your situation. The guidance quoted was published in October 2024, addresses glucagon-like peptide-1 receptor agonists, and names Ozempic, Wegovy, Saxenda and Trulicity; tirzepatide is not among them and is a judgement for your anaesthetist. Please consult Dr. Ashutosh A Shah, your anaesthetist and your prescribing doctor about your own plan.
Frequently Asked Questions
Do I need to stop Mounjaro one week before a tummy tuck?
Not as a rule. The one-week instruction comes from 2023 guidance that was superseded in October 2024, when five societies together advised that most patients should continue these drugs before elective surgery. Two caveats: Mounjaro is tirzepatide and is not among the drugs named in that release, and you may still be asked to wait if your dose is still being increased. A tummy tuck surgeon in Adajan Surat will confirm the plan with your anaesthetist rather than applying a fixed rule.
Is generic semaglutide treated the same as Ozempic before surgery?
Yes. The guidance is organised by molecule rather than by brand, and it names semaglutide twice under two different brand names. What your anaesthetist needs is the molecule, the dose and when you last took it, not the label on the pen.
What if I took my weekly dose two days before surgery?
Tell the anaesthetist, and do not assume it cancels the operation. Current guidance does not require a fixed gap between the last dose and surgery for most patients. What matters more is whether your dose is stable and whether you have had any gastrointestinal symptoms in the last week.
Will stopping the injection make me regain weight before surgery?
The societies do not discuss weight regain. What they do flag is the "risk that stopping the GLP-1 drug may have on the condition being addressed by the GLP-1 drug" and the risk of "other negative side effects such as impacting blood sugar levels". That is a reason to involve your prescriber in any pause rather than stopping on your own.
Is the rule different for liposuction under local anaesthesia?
Possibly, but do not assume it. Both society statements tie the aspiration risk specifically to general anaesthesia and deep sedation, and neither addresses local anaesthesia or light sedation. Since sedation is often added to a local case, and the depth is decided on the day, this is a question for your anaesthetist about your specific plan.
Should I restart the injection immediately after surgery?
Ask your prescriber, because neither society statement covers restarting. The decision usually depends on how well you are eating and drinking, how your bowels are working and your blood sugar, none of which can be predicted in advance. Agree the plan before surgery so you are not deciding it while recovering.
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About Dr. Ashutosh Shah
Dr. Ashutosh Shah, M.S., M.Ch. (Plastic Surgery), has over 22 years of experience in body contouring after weight loss. He leads Elegance Clinic, Surat, with centres at Adajan and Vesu, and is known for honest counseling and natural looking results.