Informational only. Not medical advice.INFORMATIONAL PLATFORM ONLY — NOT MEDICAL ADVICE, DIAGNOSIS, OR TREATMENT
Informational only. Not medical advice.INFORMATIONAL PLATFORM ONLY — NOT MEDICAL ADVICE, DIAGNOSIS, OR TREATMENT
Head-to-head comparison of Semaglutide and Liraglutide — mechanism, dosing, side effects, legal status, and pricing.
Semaglutide is an FDA-approved GLP-1 receptor agonist marketed as Ozempic (SubQ, type 2 diabetes), Wegovy (SubQ, chronic weight management and cardiovascular risk reduction in obesity), and Rybelsus (oral, type 2 diabetes). It is a synthetic analog of native GLP-1 with a fatty-acid (C18 diacid) side chain that enables albumin binding, giving it a ~165-hour half-life suitable for once-weekly injection.
Liraglutide is an FDA-approved GLP-1 receptor agonist marketed as Victoza (type 2 diabetes, approved 2010) and Saxenda (chronic weight management, approved 2014). It was the first GLP-1 analog approved for obesity and carries an FDA boxed warning for the risk of thyroid C-cell tumors. Pediatric indications include type 2 diabetes in patients ≥10 years (Victoza) and obesity in patients ≥12 years with BMI ≥95th percentile (Saxenda).
Semaglutide
Liraglutide
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The STEP program (STEP 1–8) showed average weight loss of roughly 15% of body weight over 68 weeks with weekly 2.4 mg semaglutide. The SUSTAIN program established A1c and cardiovascular benefit in type 2 diabetes. The PIONEER program established efficacy of oral semaglutide (Rybelsus) versus placebo, sitagliptin, empagliflozin, and liraglutide. The SELECT trial (2023) showed a 20% relative reduction in major adverse cardiovascular events in adults with overweight/obesity and established cardiovascular disease but without diabetes, leading to an expanded Wegovy indication.
The SCALE Obesity and Prediabetes trial (Pi-Sunyer et al., NEJM 2015; PMID 26132939) demonstrated ~8% body-weight loss with Saxenda 3.0 mg over 56 weeks, and the SCALE Diabetes trial (Davies et al., JAMA 2015; PMID 26284720) showed 6.0% weight loss in adults with type 2 diabetes. The LEADER cardiovascular outcomes trial (Marso et al., NEJM 2016; PMID 27295427) showed a 13% reduction in major adverse cardiovascular events in type 2 diabetes with established CVD or high CV risk. A pediatric Phase 3 trial (Kelly et al., NEJM 2020; PMID 32233338) supported Saxenda's approval for adolescents ≥12 years.
Key references
Semaglutide and Liraglutide are both in the Metabolic category and may have overlapping mechanisms. Researchers should review both profiles carefully, understand the mechanisms of action, and monitor the relevant biomarkers when combining compounds in the same class. As always, consult a licensed healthcare provider before making any decisions about combining research compounds.
This platform provides informational tools only, not medical advice. This comparison is for educational purposes only. Consult a licensed provider.
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