Semaglutide
approvedAlso known as: Ozempic, Wegovy, Rybelsus, NN9535
Semaglutide is a long-acting glucagon-like peptide-1 (GLP-1) receptor agonist with approximately 94% structural homology to native human GLP-1. Its mechanism of action involves binding to and activating GLP-1 receptors in pancreatic beta cells, leading to glucose-dependent insulin secretion, suppression of glucagon release, and delayed gastric emptying. Additionally, central GLP-1 receptor activation in the hypothalamus reduces appetite and food intake, contributing to weight loss. The molecule is engineered with a fatty acid side chain that facilitates albumin binding, extending its half-life to approximately one week for subcutaneous formulations (Ozempic, Wegovy) and enabling once-daily oral administration (Rybelsus) via an absorption enhancer. Key research findings from over 4,800 PubMed-indexed studies demonstrate robust efficacy in glycemic control and weight management. The SUSTAIN and PIONEER trials showed significant reductions in HbA1c (1.0–1.8%) and body weight (4–15%) compared to placebo and active comparators. The SELECT trial (2023) further established cardiovascular benefits, with a 20% reduction in major adverse cardiovascular events in overweight or obese patients without diabetes. Semaglutide also improves non-alcoholic steatohepatitis (NASH) markers and reduces inflammation, though long-term safety data continue to accumulate. Clinically, semaglutide is approved for type 2 diabetes (Ozempic, Rybelsus) and chronic weight management (Wegovy) in adults with obesity or overweight with comorbidities. Dosing is titrated to minimize gastrointestinal side effects (nausea, vomiting, diarrhea), which occur in up to 40% of patients but typically subside. Contraindications include personal or family history of medullary thyroid carcinoma and multiple endocrine neoplasia syndrome type 2. Ongoing research explores its potential in heart failure, chronic kidney disease, and addiction disorders. For research purposes only — not medical advice.
Key data
C187H291N45O59Research & studies
Semaglutide and tirzepatide each reduced the primary composite endpoint by more than 40% compared with sitagliptin.; Tirzepatide did not show a meaningful risk reduction over semaglutide (HR 0.86, 95% CI 0.70-1.06).; Results were consistent across negative controls, secondary endpoints, subgroups, and sensitivity analyses.; No substantially increased risk was observed for select safety endpoints.
Tirzepatide 10 and 15 mg were associated with statistically significant greater reductions in weight, BMI, and HbA1c versus semaglutide 2.4 mg.; Tirzepatide 15 mg showed statistically significant greater odds of achieving 5% and 15% weight reduction and improvements in waist circumference, fasting plasma glucose, and triglycerides.; Both tirzepatide doses had non-significant trends toward greater improvements in HDL, LDL, systolic and diastolic blood pressure, and a generally comparable safety profile to semaglutide.; This is the first indirect comparison of tirzepatide and semaglutide specifically in patients with type 2 diabetes and overweight or obesity.
Semaglutide improved histological markers of fibrosis and inflammation in two preclinical MASH models.; Hepatic expression of fibrosis-related and inflammation-related gene pathways was reduced by semaglutide.; 72 serum proteins were significantly associated with MASH resolution and semaglutide treatment in a clinical trial.; The same 72 proteins were differentially expressed in MASH patients versus healthy individuals in an independent cohort.
In type 2 diabetes, semaglutide reduced major adverse cardiovascular events by 26% (SUSTAIN-6) and major kidney disease events by 24% (FLOW).; In overweight or obese individuals with cardiovascular disease, semaglutide reduced major adverse cardiovascular events by 20% (SELECT) and slowed kidney function loss.; Semaglutide alleviates heart failure symptoms and reduces hospitalizations in obese individuals regardless of diabetes status.; Semaglutide's real-world use supports its safety and effectiveness across diverse patient groups, with a generally favorable safety profile.
Semaglutide shows therapeutic efficacy in ameliorating cardiometabolic risk factors and physical functioning, independent of body weight reduction.; Potential mechanisms include adipose tissue browning, anti-inflammatory, mitochondrial biogenesis, antioxidant, and autophagy-regulating effects.; Most supporting evidence on mechanistic actions is preclinical, demonstrated in rodents and not confirmed in humans.; Possible applications in protection from infections and anti-aging properties are discussed.
In type 2 diabetes patients, NAION cumulative incidence over 36 months was 8.9% for semaglutide vs 1.8% for non-GLP-1 RA medications.; In overweight/obese patients, NAION cumulative incidence over 36 months was 6.7% for semaglutide vs 0.8% for non-GLP-1 RA medications.; Semaglutide was associated with a 4.28-fold higher risk of NAION in type 2 diabetes and a 7.64-fold higher risk in overweight/obese patients.; The study suggests an association but cannot confirm causality due to its observational design.
Tirzepatide 15 mg was most efficacious for HbA1c reduction (mean difference -21.61 mmol/mol vs placebo), followed by tirzepatide 10 mg, semaglutide 2.0 mg, tirzepatide 5 mg, semaglutide 1.0 mg, and semaglutide 0.5 mg.; All tirzepatide doses were comparable to semaglutide 2.0 mg and superior to semaglutide 1.0 mg and 0.5 mg for HbA1c reduction.; Tirzepatide reduced body weight more than semaglutide, with reductions from 9.57 kg (15 mg) to 5.27 kg (5 mg) vs semaglutide from 4.97 kg (2.0 mg) to 2.52 kg (0.5 mg).; Both drugs increased gastrointestinal adverse events compared to placebo, but neither increased serious adverse events or severe hypoglycemia.
Semaglutide led to a mean weight loss of 10.2% at 208 weeks, compared to 1.5% with placebo.; Waist circumference decreased by 7.7 cm with semaglutide versus 1.3 cm with placebo.; Clinically meaningful weight loss occurred across all sexes, races, body sizes, and regions.; Serious adverse events were lower with semaglutide across all BMI categories, though discontinuation rates were higher.
Frequently asked questions
What is Semaglutide?
Semaglutide is a long-acting glucagon-like peptide-1 (GLP-1) receptor agonist with approximately 94% structural homology to native human GLP-1. Its mechanism of action involves binding to and activating GLP-1 receptors in pancreatic beta cells, leading to glucose-dependent insulin secretion, suppression of glucagon rel
How does Semaglutide work?
Long-acting GLP-1 receptor agonist that improves glycemic control, slows gastric emptying, and reduces appetite.
What is the research status of Semaglutide?
Semaglutide is currently classified as approved, with 5,382 research references on record. This is for research purposes only and is not medical advice.
What is the half-life of Semaglutide?
The reported half-life of Semaglutide is ~7 days.
What is the molecular weight of Semaglutide?
Semaglutide has a molecular weight of approximately 4114 g/mol (formula C187H291N45O59).
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