Should You Stop Ozempic, Wegovy or Mounjaro Before Surgery?

European product information for Wegovy and Mounjaro warns that delayed stomach emptying can leave residual stomach contents and that pulmonary aspiration has been reported during general anaesthesia or deep sedation. This is a real safety issue. It does not create one correct stop interval for every patient.

Recent multidisciplinary guidance has moved away from automatically stopping every weekly GLP-1 medicine for seven days. Many patients can continue treatment, while people at higher risk may need a modified diet, a change in the anaesthetic plan, a delay, or a medication hold chosen by the clinical team.

Why the advice can sound contradictory

Ozempic and Wegovy contain semaglutide. Mounjaro contains tirzepatide. These medicines can slow stomach emptying, especially when treatment is starting, the dose is increasing, or digestive symptoms are active.

The primary concern is pulmonary aspiration. If stomach contents enter the lungs during general anaesthesia or deep sedation, the result can be serious. Yet stopping treatment also has costs. It can disturb glucose control in people with diabetes, complicate treatment, and turn a short interruption into an unplanned longer break.

This is why the current question is not simply, "When was your last injection?" It is, "What is your individual aspiration risk, and how can the team reduce it safely?"

What current guidance says

According to a 2024 multi-society expert guidance paper led by Kindel and colleagues, a collaborative approach involving the patient, anaesthesia team, procedure team and prescribing clinician is recommended. It says GLP-1 treatment may continue before a procedure when the patient does not have elevated risk of delayed stomach emptying or aspiration.

The paper identifies several risk signals:

• the early dose-escalation phase
• a higher dose
• a weekly formulation
• nausea, vomiting, abdominal pain, indigestion or constipation
• another condition that can slow stomach emptying

For higher-risk patients, the team may consider a liquid-only diet for at least 24 hours, adjustment of the anaesthetic plan, stomach ultrasound where available, postponement, or a medication hold. The same guidance states that the best hold duration is not known.

If a hold is chosen, the clinical team will determine the duration. Older guidance suggested stopping a daily medicine on the day of the procedure and a weekly medicine around seven days before, but these figures are not a patient instruction. Only the teams managing the procedure and the medicine together can set a safe interval for a specific person.

A separate 2025 multidisciplinary consensus statement led by El-Boghdadly and colleagues also favoured individualised management over routine pre-procedural cessation, combined with full risk assessment and steps to reduce aspiration risk. Both documents are expert consensus, not randomised trials comparing complete perioperative strategies.

What the newest study adds, and what it does not

Dong and colleagues published a single-centre retrospective study in Surgical Endoscopy in 2026. It included 16,067 endoscopy procedures: 15,902 in people not using a GLP-1 medicine, 103 in people who continued one, and 62 after a two-week hold.

Retained stomach contents were seen in 0.4% (63 of 15,902) of the non-user group, 5.83% (6 of 103) of the continuation group and 1.61% (1 of 62) of the two-week-hold group. The difference between the continuation and hold groups rests on a handful of events.

A two-week hold was associated with less retained content than continuation, but the hold group was small, the event count was very low, and the confidence interval was wide. The study observed stomach contents during upper endoscopy. It did not randomise patients and did not prove that a two-week hold prevents aspiration across different operations, medicines or patient groups.

Five details your procedure team needs

Tell the team:

1. the exact medicine and brand, such as Ozempic, Wegovy or Mounjaro
2. your current dose and whether it recently increased
3. the date and time of your last dose
4. whether you have nausea, vomiting, bloating, abdominal pain, indigestion or constipation
5. why you take the medicine, including whether you have diabetes and use insulin or another glucose-lowering medicine

Do this before the day of an elective procedure. A same-day surprise can lead to delay or cancellation because the team has less time to assess risk.

If the operation is urgent

Do not delay urgent care to wait for a medicine to clear. Tell the anaesthesia and procedure teams when you last took it and whether you have digestive symptoms. They can treat the situation as a potentially full stomach and choose appropriate precautions.

Plan the restart before the interruption

The procedure-day decision is only half of the plan. Before stopping, ask who will decide when and at what dose treatment restarts.

Restart timing can depend on the procedure, how long treatment was interrupted, whether you are eating and drinking normally, digestive symptoms, diabetes treatment and the dose you previously tolerated. Even a short interruption of two or three doses may mean the previous dose is no longer well tolerated. Do not assume the dose is safe to restart at its prior level without checking with the prescribing team.

To minimise disruption to weight maintenance, agree on the restart contact, review point and temporary plan for meals, protein, hydration and activity. A short clinical hold should not become an indefinite gap through inattention. Surgical safety comes first, but continuity still matters once the procedure team says recovery allows it.

Frequently asked questions

The bottom line

There is no single safe stop interval for every person taking Ozempic, Wegovy or Mounjaro. Current guidance favours early disclosure, individual risk assessment and a shared plan. Some patients can continue. Others may need a liquid diet, anaesthetic precautions, postponement or a medication hold.

Élan Clinic specialises in weight maintenance and regain prevention, including plans for surgery, medication breaks and recovery.