GLP-1 Before Surgery: The Updated 2024 Guidelines Explained

The guidance changed in 2024. Most patients can continue their GLP-1 before elective surgery — here's how to make sure your surgical team is using the current protocol.

If you're on a GLP-1 medication and have surgery coming up, the guidance has changed — and your surgical and anesthesia teams may not all be on the same page yet.

In June 2023, the American Society of Anesthesiologists (ASA) issued consensus guidance recommending that most GLP-1s be held before elective surgery — on the day of the procedure for daily formulations, and for a full week for weekly injections. That blanket recommendation caused significant disruption: patients were being told to stop medications they depended on for diabetes and blood pressure control, elective surgeries were being delayed, and the clinical consequences of the interruptions were not trivial.

In October 2024, the ASA — along with four other major societies — issued updated multi-society guidance that substantially softened the original stance. Here's what the current guidance actually says, what it means for you, and what to expect from your pre-op process.

The Concern Behind the Guidance

GLP-1 medications slow gastric emptying. That's part of how they work — food stays in the stomach longer, you feel full, you eat less. Under normal circumstances, this is beneficial.

But under general anesthesia or deep sedation, a full stomach is dangerous. If stomach contents regurgitate and enter the airway (aspiration), they can cause aspiration pneumonia — a potentially fatal complication. Standard pre-op fasting (typically 8 hours for solids, 2 hours for clear liquids) is designed to ensure the stomach is empty at induction. GLP-1 medications may interfere with that assumption.

In 2023, scattered case reports suggested patients on GLP-1s had residual gastric contents despite appropriate fasting. The ASA issued its initial guidance based on those signals. But the evidence was anecdotal, and the blanket hold recommendation turned out to be disproportionate to the actual risk.

The Current (2024) Multi-Society Guidance

The updated guidance was issued jointly by the ASA, American Gastroenterological Association, American Society for Metabolic and Bariatric Surgery, International Society of Perioperative Care of Patients with Obesity, and Society of American Gastrointestinal and Endoscopic Surgeons. The core recommendations:

1. Shared Decision-Making Is the Default

Whether to hold or continue your GLP-1 before surgery should be a conversation between you, the anesthesia team, the surgeon, and your prescribing provider. There is no single rule that fits every patient. The decision weighs your metabolic need for the medication against your individual risk of delayed gastric emptying.

2. Factors That Raise Your Risk

The updated guidance identifies specific risk factors for delayed gastric emptying on GLP-1 therapy:

• Escalation phase: Patients still titrating up have higher GI effects than those on stable maintenance doses.
• Higher dose: More medication, more gastric slowing.
• Weekly dosing: Weekly formulations have more pronounced GI effects than daily.
• GI symptoms present: Active nausea, vomiting, severe bloating, or abdominal pain.
• Other risk factors: Bowel dysmotility, gastroparesis, Parkinson's disease, significant diabetes-related gastroparesis.

3. What Actually Happens Before Surgery

For patients without elevated risk:

• GLP-1 therapy may be continued pre-operatively.
• Standard ASA fasting guidelines apply (typically 8 hours solids, 2 hours clear liquids).
• The anesthesia team still assesses for symptoms on the day of surgery.

For patients with elevated risk:

• Option 1: 24-hour clear liquid diet before the procedure (the preferred strategy in most protocols).
• Option 2: Hold the medication (timing depends on the specific drug and its half-life).
• Option 3: Modified anesthesia plan — rapid sequence induction, point-of-care gastric ultrasound, or proceeding with "full stomach" precautions.
• Option 4 (rare): Delay the procedure until symptoms resolve.

Special Considerations by Medication Type

Emerging Orthopedic Data

A study presented at the 2025 AAOS Annual Meeting analyzed total joint arthroplasty (hip and knee replacement) outcomes based on timing of GLP-1 cessation. The study found that stopping at least 14 days before surgery was associated with lower rates of aspiration, aspiration pneumonitis, delayed emergence from anesthesia, and conversion to intubation. Stopping only 3–7 days before surgery was an independent risk factor for complications; not stopping at all carried the highest risk.

This data is specific to major orthopedic surgery and doesn't necessarily apply to all procedures. But it illustrates why some surgical specialties are using longer hold windows than the general multi-society guidance suggests.

What You Should Do

4–6 Weeks Before Surgery

• Inform your surgeon and prescribing provider about your GLP-1 medication.
• Ask: "Based on my specific procedure and my current dosing, what's the perioperative plan?"
• Request coordination between your prescriber and the anesthesia team.

1–2 Weeks Before Surgery

• Confirm the specific plan in writing (hold vs. continue vs. modified diet).
• If you have diabetes, ask about glucose-management bridging if you're holding the medication for an extended period.
• Stock clear liquids if a pre-op liquid diet is planned.

Day of Surgery

• Report any GI symptoms (nausea, vomiting, severe bloating, abdominal pain) honestly to the anesthesia team. These change the risk calculation.
• Don't hide what you took or when — the anesthesia team is on your side, and accurate information keeps you safer.

Emergency Surgery

For urgent or emergency procedures, there is no time to hold a GLP-1. The anesthesia team treats the patient as "full stomach" and applies standard precautions: rapid sequence induction, cricoid pressure, appropriate airway management. Aspiration risk is managed through anesthetic technique rather than pre-operative fasting.

Questions to Ask Before Any Procedure

• "What is your center's protocol for patients on GLP-1 medications?"
• "Would a 24-hour clear liquid diet work instead of holding the medication?"
• "If I need to hold insulin or another diabetes medication concurrently, what's the bridging plan?"
• "Will you use gastric ultrasound to assess stomach contents on the day of surgery?"
• "When can I safely resume my GLP-1 after the procedure?"