Before surgery or endoscopy: tell the team you use Mounjaro
If you use Mounjaro and are scheduled for surgery or an endoscopy involving general anaesthesia or deep sedation, tell the surgeon, anaesthetist or endoscopy team before the procedure. Do not assume that a medicine listed in another record has reached the person planning your anaesthetic. Give the drug name, prescribed dose, last injection date, whether you recently started or increased it, and any nausea, vomiting or marked fullness after meals. These details matter even when you have followed the fasting instructions you were given [1, 4, 5].
Mounjaro can delay gastric emptying. The manufacturer reports rare postmarketing cases of stomach contents entering the lungs during general anaesthesia or deep sedation in people taking medicines in this class, despite reported adherence to preoperative fasting. This is a reason for disclosure and individual assessment. It does not mean that aspiration will happen to every user or that every procedure must be postponed [1].
If the appointment is close and you did not mention the injection on your form, contact the procedure unit before attending. Tell the anaesthesia team again on the day. Do not stop the injection or alter diabetes medicines or fasting yourself because of a general online rule; the treating team needs to decide for your situation [1, 2, 3].
Delayed emptying does not mean everyone's stomach is full
Mounjaro affects stomach movement, but the degree and symptoms differ between people. One person may have less appetite without a procedure-day problem; another may have repeated nausea, vomiting or prolonged fullness. Your own sensation cannot confirm whether your stomach is empty. Following your fasting instructions matters, yet it does not remove the need to disclose the medicine and symptoms [1, 2].
The concern for the anaesthesia team is that stomach contents might come back up and enter the airway during certain types of anaesthesia or sedation. That is different from ordinary post-injection nausea. The Mounjaro warning concerns general anaesthesia and deep sedation; it does not establish the same plan for every procedure without sedation or for simple local anaesthesia. Tell the team exactly what procedure and sedation are planned so they can assess its specific risk [1, 3].
If fullness continues in daily life, the early-fullness Mounjaro guide explains when it needs its own review. For the operation, mention those symptoms even if they feel familiar, especially if they appeared after a dose increase or interfere with food and drink. Do not diagnose yourself with gastroparesis from the symptom alone; that diagnosis needs clinical assessment [1, 2]. [7, 8]
Five details to prepare for the pre-procedure call
Write down the exact name on the pen or vial, your prescribed dose, the day and time of your last injection, and whether you are early in treatment or recently increased the dose. Add why it was prescribed in your own plan, such as diabetes care or weight management. List your other diabetes medicines, especially insulin or a medicine that can cause low glucose, and the other medicines requested by the preoperative team. Your real medicine list or photographs of the packets are more useful than an internet checklist [2, 4, 5].
Explain any nausea, vomiting, reflux, abdominal pain, fullness long after meals or difficulty keeping fluids down. Say when it began and whether it changed near an injection or dose adjustment. Avoid saying your stomach is fine if you have been unable to eat normally in recent days. Mention any diagnosed gastroparesis or emptying disorder, while avoiding a self-diagnosis based on a temporary symptom [1, 2, 3].
Ask what procedure and type of anaesthesia or sedation are planned and when you will receive written fasting and medicine instructions. Tell the team whether this is urgent or planned and whether you had a past problem with anaesthesia or endoscopy. These details let them ask the right follow-up questions and make a specific plan instead of handing you a generic rule [2, 3].
Should you stop Mounjaro? There is no universal number of days
You may see one online rule telling everyone to stop Mounjaro for one or two weeks before any operation and another telling everyone to continue. Neither universal instruction is supported for every situation. The current Mounjaro label says evidence is insufficient to determine whether a temporary hold or altered fasting reduces residual stomach contents and aspiration risk. More recent professional guidance calls for an individual decision with the anaesthesia, procedure and prescribing teams [1, 2, 3].
The team considers current digestive symptoms, whether treatment has just started or increased, why you take it, your glucose management, the planned procedure and anaesthesia, and its urgency. They may decide usual preparation is appropriate, change preparation or the anaesthetic plan, or discuss postponing a planned procedure when risk is high. These are clinical decisions tied to your situation and the facility's resources, not options to choose on your own [2, 3].
If the team advises holding or continuing, ask for the plan in writing: which scheduled dose it covers, what happens when a dose falls on procedure day, and whom to contact if new symptoms appear. Do not shift injection days or make up a dose yourself. The Mounjaro pen and missed-dose guide addresses ordinary dosing questions outside anaesthesia preparation; this decision needs direct contact with the procedure team [1, 4]. [6]
Follow the fasting and preparation instructions from your procedure team
Fasting before anaesthesia is not an experiment to design yourself. Follow the food and fluid times written for you by the procedure unit. Gastroscopy and colonoscopy can also have their own preparation and medication instructions, depending on the procedure, sedation and your health. The gastroscopy guide and colonoscopy guide explain general preparation, but your unit's instructions govern your own appointment, particularly when you use Mounjaro [2, 3].
Do not extend fasting on your own because you think it guarantees an empty stomach. The label does not establish that a generic fasting change solves this concern, and extra fasting can complicate fluids or glucose management for some people. Equally, do not ignore the prescribed fasting because someone says the injection is irrelevant. If you have vomiting or troublesome fullness despite fasting, tell the team promptly instead of hiding symptoms for fear that the appointment might change [1, 2, 3].
If you receive apparently different instructions from the endoscopy unit and your prescriber, contact them to reconcile the full medicine plan. Ask for clear answers about the last permitted food and drink, usual diabetes medicines, and what to do if you cannot complete preparation. Do not copy an online '24-hour liquid diet' unless your own procedure team has directed it for you [2, 3]. [9, 10]
New symptoms before the appointment? Tell the team even after correct fasting
If you develop repeated nausea, vomiting, bloating or marked fullness after a few bites in the days before the appointment, contact the procedure team early. State the medicine and last injection date. Symptoms may change the team's assessment of retained stomach contents. Do not conceal them to keep a scheduled date; the team needs truthful information to balance the procedure's benefit with an appropriate safety plan [1, 2, 3].
If you cannot keep fluids down or develop severe dizziness or much less urine, seek urgent medical assessment for possible dehydration rather than only calling to rearrange endoscopy. Severe, persistent abdominal pain that may spread to the back, with or without vomiting, also requires urgent help. Follow the prescribing label's pancreatitis warning: stop Mounjaro if pancreatitis is suspected and obtain urgent medical evaluation. Do not wait until procedure day or treat every pain as ordinary slowed stomach movement [1, 5].
For milder but ongoing symptoms, ask whether the team needs to assess you or alter preparation. Write down when symptoms started and what you have managed to eat and drink, but do not make a diary a condition for calling. Your current condition matters more than having followed every fasting instruction precisely. A clinician can decide whether a separate assessment is needed before a planned anaesthetic [2, 3]. [11]
If you use Mounjaro for diabetes, coordinate medicines and fasting
If Mounjaro is part of diabetes treatment, tell the anaesthesia and prescribing teams about every other diabetes medicine, particularly insulin or a sulfonylurea. Reduced food, fasting and vomiting may change glucose readings, and a decision to hold or continue a medicine may also affect the plan. The 2026 hospital diabetes standards call for a personalized perioperative approach considering the indication, symptoms, procedure, anaesthesia and glucose management. One medicine schedule cannot fit everyone [2].
Before the appointment ask whether to check glucose at home on procedure morning, whom to call for a reading outside your personal range, and what to do if you miss a meal or cannot drink the prescribed preparation. Your team's written instructions should answer these questions. Do not change insulin or other diabetes medicine doses yourself because you are hungry or anxious about anaesthesia. If you have low-glucose symptoms, follow the rescue plan from your diabetes team and inform the procedure team [2, 4].
The guide to low blood sugar with Mounjaro plus insulin or sulfonylureas explains why symptoms and missed meals matter, but it is not a preoperative plan. If the team advises holding an injection or postponing a procedure, ask how glucose will be monitored until your usual eating and medicine plan resumes. Coordination between clinicians helps avoid conflicting instructions [2, 3].
For an urgent procedure, tell the team immediately
For emergency surgery or an urgent endoscopy, do not decide to delay needed care because you recently took Mounjaro, and do not hide the injection. Tell the doctor, nurse and anaesthetist when the last dose was, when you last ate or drank, and whether you have nausea, vomiting or marked fullness. A medicine list on your phone or with a companion can help if you cannot speak. Urgent care is not automatically postponed for a fixed number of days after an injection; the team weighs anaesthetic safety against the need for the procedure [1, 2, 3].
The team may adjust the anaesthetic approach, time a non-immediate procedure differently or take other precautions according to your condition and available resources. This page cannot tell you which test or anaesthetic technique to request. Fasting alone does not settle the question. Multisociety guidance leaves the risk balance with the procedure team because both delay and possible retained stomach contents matter in a specific case [2, 3].
If the pain, bleeding or other problem needing the procedure is an emergency, follow emergency-care instructions directly. Do not wait for a routine nutrition visit to resolve medication timing first. Once stable, the prescriber and hospital team can coordinate resuming your treatment plan. Right now the essential step is getting accurate information to those giving anaesthesia or deep sedation [1, 4, 5].
After the procedure: confirm food, fluids and medicine before resuming
After surgery or endoscopy, your ability to drink and eat may differ, and you may have instructions related to anaesthesia or the procedure itself. Before discharge, ask when to start fluids and food for your situation and what to do if vomiting prevents you keeping fluids down. Do not use a general article's meal schedule to override hospital instructions. If you fasted for a long period or your diabetes medicines changed, obtain a clear glucose-monitoring and contact plan [2, 4, 5].
Also ask when Mounjaro should resume and who will confirm that decision, especially if a dose fell during your hospital stay or you still cannot eat normally. Do not double up to compensate for a missed dose, and do not assume discharge automatically returns every medicine to the old schedule. The prescriber may need details of the procedure, current digestive symptoms, food intake and new medicines. Tell the procedure team about new nausea or pain before leaving [1, 2, 5].
After discharge, repeated vomiting, inability to keep fluids down, severe dizziness, severe persistent abdominal pain or any warning sign named in your discharge sheet deserves prompt action under the team's instructions. Do not attribute every symptom to the operation or the injection without assessment. The goal is a workable food, fluid and medicine plan, followed by a nutrition review if poor appetite persists [1, 4, 5].
Leave the preparation call with five clear answers
At the end of the preparation call, get five clear answers, preferably in writing. Does the anaesthesia team need any more symptom details? What are the exact fasting and preparation instructions for this procedure? What is the decision about the next Mounjaro dose? If you have diabetes, what is the glucose and other-medicine plan? Whom do you call if vomiting starts or the operation date changes? Save the plan and the team that issued it alongside your medicine list [1, 2, 3].
If instructions conflict, do not pick whichever sounds easiest or strictest. Ask the team providing anaesthesia to reconcile them with the prescriber. If warning signs appear, especially inability to keep fluids down or severe persistent abdominal pain, seek urgent care rather than waiting for a routine reply. If you are stable and the procedure is planned, resolving questions before the date can reduce confusion on arrival [1, 2, 5].
A nutrition clinic can later help with food intake if appetite or meals remain difficult, but it cannot replace the surgeon's or anaesthetist's instructions. For a nonurgent food-plan review related to Mounjaro, start from the booking page and mention the planned procedure and date. The procedure-day fasting, anaesthesia and medicine decisions remain with the procedure team and prescriber [2, 3, 4].
