Semaglutide Cuts Heavy Drinking Days in Alcohol Use Disorder

TL;DR: In a 26-week, double-blind RCT of 108 treatment-seeking adults with alcohol use disorder and obesity, once-weekly semaglutide 2.4 mg reduced heavy drinking days by an additional 13.7 percentage points versus placebo (p=0.0015), with consistent improvements across multiple alcohol-related, biomarker, and metabolic secondary outcomes.

Abstract

Study at a Glance

Study Snapshot

Study Facts Table

What Researchers Actually Did

From June 2023 to February 2025, investigators at Mental Health Centre Copenhagen enrolled 108 adults with DSM-5 moderate-to-severe alcohol use disorder, a BMI of 30 kg/m² or higher, an AUDIT score above 15, and a minimum of 6 heavy drinking days (defined as at least 60 g of alcohol per day for men and at least 48 g per day for women) within the 30 days prior to enrolment. Participants were randomised 1:1 to once-weekly subcutaneous semaglutide, escalated every 4 weeks from 0.25 mg to a target of 2.4 mg, or to matched saline placebo injections. All participants received up to 10 sessions of standardised CBT focused on motivation, craving management, and relapse prevention. Participants wore blindfolds and headphones during weekly injection visits to mask the audible pen-click from the semaglutide device. CBT delivery and all outcome assessments were conducted by masked personnel; statistical analyses were performed by a masked external statistician.

The primary outcome was the change in the percentage of heavy drinking days, measured using the Timeline Followback (TLFB) method. To address the known phenomenon of reduced drinking after initial telephone screening, baseline alcohol use was anchored to the 30 consecutive days with the highest alcohol consumption drawn from the 40 days preceding enrolment. This same highest-consumption 30-day window was applied at every subsequent assessment, preserving internal consistency but departing from the conventional approach of using the most recent 30-day window. Analysis followed the intention-to-treat principle. Missing data were handled with multiple imputation by predictive mean matching, with three pre-planned sensitivity analyses under more conservative assumptions.

Key Findings: Primary Outcomes

• Heavy drinking days (primary endpoint): Semaglutide reduced heavy drinking days by 41.1 percentage points from baseline (95% CI –48.7 to –33.5), versus 26.4 percentage points with placebo (–34.1 to –18.6). The estimated treatment difference was –13.7 percentage points (95% CI –22.0 to –5.4; p=0.0015).
• Effect size: Cohen’s d=0.57 (95% CI 0.14–0.99) for heavy drinking days — within the medium range by convention.
• Sensitivity analyses: Complete-case analysis, return-to-baseline imputation, and 50% reduction imputation all preserved the direction and approximate magnitude of the primary finding, as reported by the authors.
• Post-hoc adjustment for sex, age, and baseline heavy drinking days: Results remained robust (reported in appendix).

Key Findings: Secondary Outcomes and Subgroup Analyses

• Total alcohol consumption: –1550.2 g/30 days (semaglutide) vs –1025.9 g/30 days (placebo); ETD –467.5 g/30 days (95% CI –739.5 to –195.4; p<0.0009). Cohen’s d=0.54.
• Drinks per drinking day: –3.5 units vs –2.1 units; ETD –1.5 (–2.6 to –0.5; p=0.0051). Cohen’s d=0.45.
• Alcohol craving (PACS score): ETD –3.1 (–5.1 to –1.2; p=0.0020).
• AUDIT score: ETD –3.3 (–5.5 to –1.1; p=0.0044).
• AUDIT-C score: ETD –1.5 (–2.6 to –0.4; p=0.0071).
• WHO risk drinking levels: ETD –0.52 (–0.89 to –0.16; p=0.0055). Semaglutide participants also showed a significantly greater 2-level reduction in WHO risk drinking category versus placebo.
• Number needed to treat for a 2-level WHO risk level decrease: 4.3 (95% CI 2.33–30.3).
• Days without alcohol consumption: ETD 10.1 percentage points (–0.0 to 20.2; p=0.051) — this secondary endpoint did not reach statistical significance.
• Phosphatidyl ethanol (objective alcohol biomarker): ETD –0.28 µmol/L (–0.41 to –0.15; p<0.0001), corroborating self-reported outcomes.
• GGT (liver enzyme): ETD –24.2 U/L (–33.4 to –15.1; p<0.0001).
• Mean corpuscular volume: ETD –1.7 fL (–2.6 to –0.7; p=0.0007).
• Amylase: Semaglutide group showed an increase of 4.7 U/L vs a decrease of 0.9 U/L with placebo; ETD 5.1 (2.5–7.7; p=0.0002). Four semaglutide participants had asymptomatic amylase elevations above the upper limit of normal (highest: 123 U/L; normal range 10–65 U/L).
• Bodyweight: ETD –9.0 kg (–11.2 to –6.7; p<0.0001). Mean weight loss was –11.2 kg with semaglutide vs –2.2 kg with placebo.
• Waist circumference: ETD –8.3 cm (–11.2 to –5.4; p<0.0001).
• HbA1c: ETD –0.3% (–0.4 to –0.2; p<0.0001).
• Systolic blood pressure: ETD –6.8 mm Hg (–13.5 to –0.1; p=0.047).
• Quality of life (WHOQOL-BREF): Semaglutide improved self-evaluated general health (ETD 0.48 [0.13–0.83]) and psychological health (ETD 1.51 [0.15–2.88]), but not overall quality of life or physical health domains.
• DUDIT, FTND score, and cigarette consumption: No significant differences between groups.
• Spearman correlation: Greater weight loss was significantly associated with greater reduction in heavy drinking days in the semaglutide group (rho=–0.40, p=0.0038), but not in the placebo group (rho=0.03, p=0.85).

Subgroup Analyses

• Severe AUD (DSM-5): Significant treatment effect (ETD –12.0 [–19.4 to –4.6]). This subgroup comprised 92 of 108 participants.
• Baseline 12–17 heavy drinking days: Significant treatment effect (ETD –22.7 [–33.3 to –12.2]).
• Moderate AUD subgroup and other baseline heavy-drinking strata: No statistically significant effect detected, though authors attribute this to low power given the small numbers in each subgroup (as few as 17 participants per subgroup). Consistent directional trends toward benefit were observed across all subgroups.

Adverse Events and Safety Profile

Event	Semaglutide (n=54)	Placebo (n=54)
Nausea	31 (57%)	4 (7%)
Constipation	19 (35%)	9 (17%)
Loss of appetite	19 (35%)	8 (15%)
Reflux	15 (28%)	1 (2%)
Diarrhoea	15 (28%)	11 (20%)
Fatigue	17 (32%)	10 (19%)
Food aversion	13 (24%)	1 (2%)
Abdominal pain	11 (20%)	4 (7%)
Vomiting	8 (15%)	1 (2%)
Elevated amylase (asymptomatic, above ULN)	4 (7%)	0
Hospital Evidence Watch Reading Tool Read This Paper Through Nine Different Lenses The same evidence can produce very different conclusions depending on the question being asked. Explore this study through multiple physician-guided interpretive frameworks. OVERVIEW Semaglutide reduces heavy drinking days by 13.7 percentage points in AUD-obesity patients. OverviewWhy this paper matters Patient TakeawayReal-world implications Clinician’s POVClinical decision-making A Skeptical ReadAlternative explanations Study CriticMethodology audit Compared to Past ResearchHistorical context Practical ConsiderationsImplementation barriers Future DirectionsWhat comes next Misreadings & Bad-Faith TakesCommon distortions Overview Badge 1: ValueBadge 2: EvidenceBadge 3: Innovation This study demonstrates that semaglutide, a GLP-1 receptor agonist, significantly reduces heavy drinking days in patients with alcohol use disorder and obesity. The treatment also led to substantial improvements in secondary outcomes such as weight loss and reduced alcohol craving scores. The findings suggest a potential new therapeutic approach for AUD, particularly in individuals with comorbid obesity, offering hope for more effective treatments. Semaglutide reduced heavy drinking days by 13.7 percentage points compared to placebo. Significant weight loss and reduced alcohol craving scores were observed. GLP-1 receptor agonists may influence brain pathways involved in reward and craving. Key Insight Semaglutide significantly reduces heavy drinking days in patients with AUD and obesity. Patient Takeaway Badge 1: HopeBadge 2: TreatmentBadge 3: Research For patients with alcohol use disorder and obesity, semaglutide offers a promising new treatment option. The study shows that it can significantly reduce heavy drinking days and improve related symptoms like weight loss and reduced craving. While more research is needed to confirm long-term efficacy, this treatment could provide additional support for those seeking recovery from AUD. Semaglutide reduces heavy drinking days by 13.7 percentage points. Weight loss of 9 kg was observed in the semaglutide group. Reduced alcohol craving scores indicate potential psychological benefits. Patient Takeaway Semaglutide may offer a new treatment option for reducing heavy drinking days. Clinician’s POV Badge 1: EvidenceBadge 2: TreatmentBadge 3: Research Clinicians can consider semaglutide as a potential adjunctive therapy for patients with alcohol use disorder and obesity. The study provides robust evidence of its efficacy in reducing heavy drinking days and improving related outcomes. Further research is needed to explore the long-term benefits and safety, but this treatment could be an important addition to existing therapeutic options. Semaglutide reduces heavy drinking days by 13.7 percentage points. Significant weight loss and reduced alcohol craving scores were observed. GLP-1 receptor agonists may influence brain pathways involved in reward and craving. Clinician Takeaway Semaglutide shows promise as a treatment for reducing heavy drinking days in AUD-obesity patients. A Skeptical Read Badge 1: SkepticismBadge 2: EvidenceBadge 3: Research While the study provides strong evidence of semaglutide’s efficacy, some skepticism remains regarding its long-term benefits and safety in treating alcohol use disorder. The treatment’s mechanism of action is not fully understood, and more research is needed to confirm these findings. Clinicians should consider this treatment with caution and monitor patients closely for adverse effects. Semaglutide reduces heavy drinking days by 13.7 percentage points. Gastrointestinal side effects were common but mostly mild to moderate. Further research is needed to explore long-term efficacy and safety. Skeptic Takeaway While promising, semaglutide’s long-term benefits and safety in AUD require further investigation. Study Critic Badge 1: CriticismBadge 2: EvidenceBadge 3: Research Critics may argue that the study’s focus on patients with comorbid obesity limits its generalizability to all AUD populations. Additionally, the treatment’s mechanism of action is not fully understood, and more research is needed to confirm these findings. The study’s results should be interpreted with caution, and further clinical trials are necessary to validate these outcomes in diverse patient groups. Study focused on patients with comorbid obesity. Mechanism of action for reducing alcohol consumption is not fully understood. Further research needed to confirm findings in diverse populations. Critic Takeaway Critics highlight the need for further research to validate semaglutide’s efficacy in diverse AUD populations. Compared to Past Research Badge 1: HistoryBadge 2: ResearchBadge 3: Context Previous studies have suggested that GLP-1 receptor agonists may reduce alcohol consumption, but this study provides the first robust evidence in a randomized controlled trial setting. The findings build on preclinical and initial human studies indicating potential benefits of semaglutide for AUD. This research contributes to the growing body of literature exploring novel treatment approaches for alcohol use disorder. Previous studies suggested GLP-1 receptor agonists may reduce alcohol consumption. This study provides robust evidence in a randomized controlled trial setting. Research builds on preclinical and initial human studies. Historical Context This study builds on previous research suggesting GLP-1 receptor agonists may reduce alcohol consumption. Practical Considerations Badge 1: PracticalBadge 2: ImplementationBadge 3: Application Practically, semaglutide could be considered as an adjunctive therapy for patients with AUD and obesity. The treatment’s efficacy in reducing heavy drinking days and improving related outcomes suggests potential benefits for clinical practice. Clinicians should monitor patients closely for adverse effects and consider individual patient profiles when deciding on treatment options. Semaglutide reduces heavy drinking days by 13.7 percentage points. Significant weight loss and reduced alcohol craving scores were observed. Gastrointestinal side effects were common but mostly mild to moderate. Practical Takeaway Semaglutide could be considered as an adjunctive therapy for AUD-obesity patients. Future Directions Badge 1: FutureBadge 2: ResearchBadge 3: Innovation Future research should explore the long-term efficacy and safety of semaglutide in treating alcohol use disorder. Additional studies are needed to confirm these findings in diverse patient populations and to better understand the treatment’s mechanism of action. The potential for GLP-1 receptor agonists as a novel treatment target for AUD is promising, but more clinical trials are necessary. Further research needed to explore long-term efficacy and safety. Additional studies required in diverse patient populations. Mechanism of action for reducing alcohol consumption needs further investigation. Future Research Future research is needed to confirm semaglutide’s long-term benefits and safety in AUD. Misreadings & Bad-Faith Takes Badge 1: MisreadingBadge 2: ClarificationBadge 3: Accuracy It is important to clarify that while semaglutide reduces heavy drinking days, it does not eliminate alcohol use disorder. The treatment should be considered as an adjunctive therapy alongside standard care like cognitive behavioral therapy. Misreadings of the study’s findings could lead to unrealistic expectations about the treatment’s efficacy and potential side effects. Semaglutide reduces heavy drinking days but does not eliminate AUD. Treatment should be considered as an adjunctive therapy alongside standard care. Misreadings could lead to unrealistic expectations about efficacy and side effects. Avoid Misreading Semaglutide reduces heavy drinking days but is not a cure for AUD. Have thoughts on this? Share it: X Share on X in Share on LinkedIn 🦅 Share on BlueSky 📷 Follow on Instagram 📝 Read more on Substack 🔔 Subscribe via RSS RELATED READING AT CED CLINIC Continue exploring the evidence How CED Clinic Approaches Metabolic Care An overview of the physician-led metabolic program at CED Clinic, including how GLP-1 therapies fit into a whole-person treatment framework. Explore evidence GLP-1 Medications and Weight Loss: What Patients Need to Know A clinical overview of GLP-1 receptor agonists, their mechanisms, expected outcomes, and what individualized care looks like in practice. Read article Cannabis for Pain Management: Matching Products to Symptoms A practical guide to cannabinoid selection for pain, relevant for patients managing overlapping metabolic and pain concerns. Continue reading Physician-Led, Whole-Person Care A doctor who takes the time to truly understand you. Personal care that starts with listening and is guided by experience and ingenuity. Health, Longevity, Wellness One-on-One Cannabis Guidance Metabolic Balance Leave a Message Metabolic Care Medical Consulting Cannabis Care What is semaglutide? Semaglutide is a GLP-1 receptor agonist used primarily for weight management and diabetes, but recent studies suggest it may also help reduce alcohol consumption. How effective was semaglutide in reducing heavy drinking days? Semaglutide reduced heavy drinking days by 41.1 percentage points from baseline compared to a 26.4 percentage point reduction with placebo, resulting in an estimated treatment difference of –13.7 percentage points. What were the secondary outcomes observed? Secondary outcomes included reduced total alcohol consumption, fewer drinks per drinking day, lower alcohol craving scores, and significant weight loss. Were there any adverse effects noted in the study? The most common adverse events were gastrointestinal issues like nausea and constipation, which were mostly transient and mild to moderate. What is the significance of this study for patients with alcohol use disorder? This study suggests semaglutide could be a novel treatment option for reducing heavy drinking in patients with comorbid obesity and alcohol use disorder. How does semaglutide work to reduce alcohol consumption? The exact mechanism is not fully understood, but GLP-1 receptor agonists may influence brain pathways involved in reward and craving. What are the implications for future research? Future studies should explore the long-term efficacy and safety of semaglutide in treating alcohol use disorder, as well as its potential benefits in other populations. Is this treatment available now? Semaglutide is approved for weight management and diabetes but not specifically for alcohol use disorder. Its availability for AUD would depend on further clinical trials and regulatory approvals. Who might benefit most from semaglutide treatment? Patients with moderate to severe alcohol use disorder who are also obese may benefit the most, based on this study’s findings. What is the next step in bringing semaglutide to market for AUD? The next steps include additional clinical trials to confirm efficacy and safety, followed by regulatory submissions and potential approval for use in alcohol use disorder.