As the Christmas season approaches, millions of people in the UK using GLP-1 weight-loss medications such as Mounjaro, Wegovy, and Ozempic are preparing to celebrate at parties, nights out, and social events.

These injectable treatments mimic the hormone glucagon-like peptide-1 to curb appetite and promote sustained weight loss. Their popularity has surged, with prescriptions for semaglutide (the active ingredient in Wegovy and Ozempic) exceeding 100,000 per month by mid-2025, according to NHS data. Demand for tirzepatide in Mounjaro has also risen, driven by its benefits for type 2 diabetes and obesity management.

While moderate alcohol consumption is not prohibited, experts at online pharmacy service Prescription Doctor urge GLP-1 users to be mindful of interactions that may increase the risk of nausea, low blood sugar, and gastrointestinal discomfort during the festive period.

How GLP-1s affect alcohol processing

Research supports these concerns. A 2025 Yale School of Medicine study published in npj Metabolic Health and Disease found that GLP-1 receptor agonists slow the liver’s metabolism of alcohol, potentially leading to higher blood alcohol levels and prolonged intoxication. Experts at the University of California San Francisco Weight Management Clinic also report that users may feel alcohol’s effects more strongly due to reduced food intake and altered absorption.

Dr Giuseppe Aragona, medical practitioner at Prescription Doctor, explains how GLP-1 users can safely enjoy alcohol over Christmas: “Alcohol is a normal part of the festive season for many, and while those on GLP-1 treatments should not miss out on enjoying the season, it is important to avoid excessive consumption.

Drinking too much can worsen common GLP-1 side effects like nausea, acid reflux, dizziness, and vomiting. It can also increase the risk of low blood sugar, especially when combined with reduced food intake.

Gastric emptying occurs more slowly among those taking GLP-1 medications, which means alcohol may be absorbed differently, leading some to feel stronger or more unpredictable effects than usual.

This combination of slowed digestion, reduced appetite, and high-calorie festive drinks can create a ‘perfect storm’ of consequences: faster intoxication, more severe hangovers, and intense gastrointestinal upset.”

Expert guidance and medical consensus

The National Institute for Health and Care Excellence (NICE) highlights monitoring for hypoglycaemia, particularly when alcohol is consumed. A 2024 review in Gastroenterology Insights notes that both alcohol and GLP-1s independently cause gastrointestinal issues, which can amplify risks such as dehydration and pancreatitis when combined.

Drinks to limit or avoid

Dr Aragona recommends GLP-1 users avoid or limit the following alcoholic beverages

• Baileys / Irish cream liqueur: High in fat and sugar; can trigger nausea.
• Sweet cocktails (Espresso Martini, White Russian, Mulled Wine with added sugar): Large sugar spikes and crashes can worsen dizziness and gastrointestinal symptoms.
• Beer and lager: Carbonation and volume may intensify bloating and fullness.
• Guinness / Stout: Heavy and filling; may clash with reduced appetite and delayed digestion.
• Sherry and Port: High sugar content increases risk of blood glucose fluctuations.
• Creamy festive cocktails (Eggnog, Snowballs, Brandy Alexander): Combined fat and alcohol can be difficult to tolerate.
• Sour mix cocktails (Whiskey Sours, Margaritas): Citric acids can aggravate nausea and reflux.

These recommendations align with a 2025 Scientific Reports study, which found high-sugar and carbonated beverages trigger rapid blood sugar swings in GLP-1 users.

Drinks better tolerated in moderation

• Gin and Slimline tonic: Low-calorie and gentle on the stomach.
• Prosecco or champagne: Lower sugar than many cocktails; carbonation may affect some users differently.
• Vodka, soda, and lime: Very low sugar, low calorie.
• Dry white wine (Sauvignon Blanc, Pinot Grigio): Moderate calorie content without excessive sweetness.
• Light spritzers: Diluted alcohol reduces strength and calorie load.
• Non-alcoholic festive alternatives: Ideal for pacing during long celebrations, especially if nausea or dizziness is present.

Opting for lower-calorie options supports weight-loss goals, as alcohol contributes empty calories, according to the British Dietetic Association.

Importance of food pairing

Dr Aragona emphasises: “GLP-1 users often feel full quickly or skip meals unintentionally. Drinking on an empty stomach is more likely, but even a small snack can lower the risk of low blood sugar and lessen the gastrointestinal impact of alcohol.”

Empty-stomach drinking heightens hypoglycaemia risks, as noted in WebMD’s 2025 analysis of Ozempic and alcohol. Diabetes UK recommends regular blood sugar checks for those managing type 2 diabetes during festive indulgences.

Additional insights

Emerging research suggests potential benefits: a 2023 Scientific Reports study found semaglutide and tirzepatide users reported reduced alcohol cravings, potentially aiding moderation. However, personalised advice is essential, as individual tolerances vary, according to experts at the Cleveland Clinic.

With mindful choices, GLP-1 users can enjoy the festive season without derailing their health journey. Consultation with a GP is recommended, especially when combining GLP-1s with other medications.