Zepbound and Anesthesia: Pre-Op Protocol

Introduction

Zepbound® is tirzepatide, a once-weekly GLP-1/GIP dual agonist. Like other long-acting GLP-1 drugs, it slows gastric emptying, and that is what makes it relevant before anesthesia. Retained food in the stomach during induction can lead to aspiration. The American Society of Anesthesiologists 2023 guidance, confirmed in the 2024 multi-society update, says hold weekly GLP-1s for one week before elective procedures requiring general anesthesia or deep sedation.

That means one missed Zepbound dose if your procedure is in that week.

Here is the protocol, the data behind it, and what to do for emergencies, restart timing, and special cases.

At TrimRx, we believe that understanding your options is the first step toward a more manageable health journey. You can take the free assessment quiz if you’re ready to see whether a personalized program is a fit for you.

When Should You Stop Zepbound Before a Procedure

Hold your weekly Zepbound dose the week of the procedure. If you inject every Sunday and your surgery is Wednesday, skip that Sunday and resume the following Sunday after surgery.

Quick Answer: ASA 2023 and the 2024 multi-society consensus recommend holding weekly GLP-1s, including Zepbound, for one week before elective procedures requiring anesthesia or deep sedation

This is the recommendation in the June 2023 ASA preoperative guidance and the 2024 update from the ASA, ASGE, IARS, ASRA, and SAMBA task force. The window is the same for any weekly GLP-1: Wegovy®, Ozempic®, Mounjaro®, and compounded versions.

For daily GLP-1 drugs like liraglutide, you only hold the day of the procedure. Zepbound is weekly, so the one-week rule applies.

Why Is Gastric Emptying the Issue

Tirzepatide slows the rate at which food leaves the stomach. That is partly why it works for weight loss. It also means an 8-hour fast, the standard pre-op rule, may not actually result in an empty stomach. Imaging studies have shown solid food still in the stomach of GLP-1 users 12 to 18 hours after their last meal.

Once you are unconscious for surgery, your gag reflex is gone. Retained gastric contents can move up the esophagus and into the lungs. Aspiration pneumonia can land a patient in the ICU.

Case series of GLP-1 users at endoscopy or intubation have repeatedly shown retained food despite proper fasting. That is why the conservative hold is now standard.

Does It Matter What Kind of Anesthesia You Are Getting

Yes. The risk centers on loss of airway protection.

General anesthesia, where you are fully unconscious with an endotracheal tube or LMA, requires the one-week Zepbound hold. Deep sedation, the kind used for colonoscopy and endoscopy, requires the same hold because airway reflexes are blunted.

Local anesthesia, where you are awake, does not require holding Zepbound. A skin biopsy, a small dental filling, an in-office mole removal: keep your dose.

Spinal or epidural anesthesia without sedation also does not require a hold. If your team plans to add midazolam or propofol on top of a spinal, talk to the anesthesiologist.

What If Your Surgery Is an Emergency

You do not stop Zepbound for emergencies. The team adjusts the airway management. Rapid sequence induction with cricoid pressure is the usual approach for a patient considered a full stomach. Ultrasound of the gastric antrum is sometimes used to check for retained contents.

Tell the trauma team or the ER the drug name, the dose, and the date of your last injection. That information changes the technique they use for intubation.

Aspiration prophylaxis with H2 blockers or proton pump inhibitors is sometimes added in this scenario, although the evidence for benefit specifically in GLP-1 users is still emerging.

How Long After the Procedure Do You Restart Zepbound

Restart your normal weekly dose once you are eating solid food and tolerating fluids. For a short outpatient procedure, that can be within 1 to 3 days. For a major abdominal operation, it might be 1 to 2 weeks.

If you missed only one weekly dose, no retitration is needed. Resume your standard dose on your normal weekly day.

If you missed two or more doses, the Zepbound prescribing information recommends restarting at a lower dose and titrating up to limit GI side effects. After a 4-week gap, restarting at 2.5 to 5 mg and stepping up is typical. Your prescriber confirms the exact plan based on how long you were off.

Does Zepbound Affect Anesthesia Drug Dosing

Not directly in any clinically meaningful way. Tirzepatide does not have known interactions with propofol, sevoflurane, fentanyl, or the other common anesthetic drugs.

It does change body composition over time. A patient who is 40 pounds lighter than at the last surgery responds differently to weight-based dosing. If you have lost significant weight on Zepbound since your previous anesthesia exposure, the team will adjust dosing for the new weight.

Postoperative nausea can be heavier in some Zepbound users since the drug itself causes nausea. Antiemetic prophylaxis with ondansetron or similar is often given.

Key Takeaway: For emergencies, you do not stop the drug; the team uses rapid sequence induction

What About Same-day Colonoscopy or Endoscopy

Hold Zepbound for one week before the procedure. Both colonoscopy and upper endoscopy use deep sedation, often with propofol, and both involve instrumentation through the GI tract where retained food is a direct problem.

For colonoscopy, several GI societies now suggest extending clear liquid intake to 24 hours pre-procedure for GLP-1 users, on top of the standard prep. The prep cleans the colon; the extra clear liquid time helps clear the stomach.

For upper endoscopy, retained food can make the exam unreadable. A retained gastric bezoar of food residue is the visible result, and the gastroenterologist may have to reschedule.

What If You Are on Zepbound for Diabetes, Not Just Weight

Same hold rule. The aspiration risk is about gastric emptying, not the diagnosis.

The difference is what fills in. Coordinate with your diabetes prescriber before holding Zepbound. They may bridge with short-acting insulin or another oral agent for the week off. Do not stop without that plan. Glucose drift up to 200 to 300 mg/dL the day of surgery is its own complication.

If you are on insulin too, your insulin schedule may need adjustment the day of surgery based on your morning glucose and your NPO status.

Are Bariatric Surgery Patients Handled Differently

Often yes. Many bariatric programs ask for a 1- to 2-week hold before bariatric surgery rather than just one week. The reason is partly aspiration and partly that the surgery itself changes gastric anatomy. Bariatric programs vary, so follow your specific surgeon protocol.

After bariatric surgery, GLP-1s like Zepbound are sometimes restarted weeks to months later if weight loss stalls or to prevent regain. The decision usually comes from the bariatric team plus the weight management physician.

If you are considering both paths, a free assessment quiz with TrimRx can map out a personalized treatment plan to compare medical and surgical options side by side.

What to Tell Your Anesthesiologist

Bring this information to the pre-op visit, not the morning of surgery:

• The drug name (Zepbound, or generic tirzepatide)
• Your current dose in mg
• The date and time of your last injection
• Total months on the drug
• Whether you have had recent nausea, vomiting, or feeling full quickly
• Whether you are also on Ozempic, Wegovy, Mounjaro, or compounded GLP-1s

The last GI symptom item matters because patients with active symptoms are more likely to have retained gastric contents. The anesthesiologist might order a gastric ultrasound or extend NPO time beyond the standard.

Disclosure at the morning check-in can delay the case. Pre-op visit is the right time.

Bottom line: Compounded tirzepatide carries the same pre-op recommendation as branded Zepbound

FAQ

What If I Took Zepbound by Mistake the Day Before Surgery

Tell the team immediately. Options include rescheduling, extending the NPO time, or using rapid sequence induction. Do not hide it.

Is the One-week Hold Based on Randomized Data

It is consensus guidance from multiple anesthesia and GI societies, supported by case series and gastric emptying physiology studies. Randomized trials of optimal hold timing are still being run. The one-week rule is intentionally conservative.

Can I Drink Clear Liquids on Zepbound the Day of Surgery

Standard NPO rules say clear liquids up to 2 hours before, but on Zepbound your team may extend that to 4 to 6 hours. Follow the facility instructions exactly.

Does Compounded Tirzepatide Need the Same Hold

Yes. The active ingredient and the pharmacology are the same as Zepbound. Compounded tirzepatide from a licensed pharmacy carries the same pre-op aspiration risk profile.

Will the Team Check My Stomach with Ultrasound

Some anesthesiologists now do bedside gastric ultrasound before induction in known GLP-1 users. Practice is uneven. Ask if it is available at your facility.

What If I Have Minor Outpatient Surgery Under Local Only

You probably do not need to hold Zepbound. Confirm with the surgeon. Local anesthesia without sedation does not carry aspiration risk because you are awake and your gag reflex is intact.

How Long After Surgery Can I Expect to Feel Normal on Zepbound Again

GI tolerance can take 1 to 2 weeks to return to your usual baseline after restarting. Pace yourself on solid food. Antiemetics for breakthrough nausea are reasonable for the first few days back on the drug.

Disclaimer: This content is for informational purposes only and does not constitute medical advice. It is not intended to diagnose, treat, cure, or prevent any disease or condition. Individual results may vary. Always consult a qualified healthcare professional before starting any weight loss program or medication.