# What Is Semaglutide? The Complete Guide **By TelosRX Editorial Team** ยท 2026-08-17 **Semaglutide is a GLP-1 receptor agonist, a lab-made peptide that mimics a gut hormone your body already produces to regulate appetite and blood sugar. [Compounded semaglutide at Telos Rx](https://www.telosrx.com/pages/semaglutide) is prescribed only after review by a licensed provider.** If searching "what is semaglutide" returned a wall of brand names, this is the plain-English version: the molecule, the brands that contain it, the formats it comes in, what the major trials reported, and how compounded preparations differ from approved products. ## Semaglutide Is the Drug. Ozempic and Wegovy Are Brands of It. This is the single most common point of confusion, and it is worth settling first. **Semaglutide is the active ingredient. Ozempic, Wegovy and Rybelsus are brand names for that same molecule**, made by Novo Nordisk and approved for different populations and different doses. So "is Ozempic semaglutide" has a short answer: yes. The brands differ in approved indication, dosing and delivery format, not in the drug inside them. The breakdown is in [Is Ozempic semaglutide?](https://www.telosrx.com/blogs/glp1/is-ozempic-semaglutide-explained) The family has also grown. As of the current FDA labels, semaglutide comes as both a weekly injection and a daily tablet, under more than one brand. Product Format FDA-approved use Label strengths **Ozempic injection** Weekly subcutaneous injection Type 2 diabetes 0.25 mg to 2 mg weekly **Ozempic tablets** Daily oral tablet Type 2 diabetes; cardiovascular risk reduction 1.5, 4, 9 mg **Rybelsus** Daily oral tablet Type 2 diabetes; cardiovascular risk reduction 3, 7, 14 mg **Wegovy injection** Weekly subcutaneous injection Chronic weight management; cardiovascular risk reduction; MASH with fibrosis 0.25 to 2.4 mg weekly, plus a 7.2 mg option **Wegovy tablets** Daily oral tablet Chronic weight management and cardiovascular risk reduction 1.5, 4, 9, 25 mg **Compounded semaglutide** Typically a weekly subcutaneous injection **Not FDA-approved.** Prepared by licensed US compounding pharmacies Varies by pharmacy and prescription Details from the [current Wegovy prescribing information](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=ee06186f-2aa3-4990-a760-757579d8f77b). The MASH indication was granted under accelerated approval and applies to the injection only. ## Is Semaglutide a Peptide? Yes. Semaglutide is a peptide, specifically a modified analog of human GLP-1, which is itself a 31-amino-acid hormone released by the gut after eating. Calling it a "semaglutide peptide" is redundant but not wrong. Native GLP-1 is broken down within minutes. Semaglutide was engineered around that: a fatty acid chain lets it bind to albumin in the blood, slowing clearance enough to support once-weekly injection. It is still a prescription drug, not a research chemical or a supplement. The word "peptide" describes its chemistry, not its regulatory status. ## How Semaglutide Works Semaglutide activates the GLP-1 receptor, found in the pancreas, the gut, and appetite-regulating regions of the brain. It prompts glucose-dependent insulin release, slows stomach emptying, and reduces hunger signalling. What most people notice is reduced appetite and earlier fullness, so intake tends to fall without deliberate calorie counting. Receptor-level detail is in [how GLP-1 works](https://www.telosrx.com/blogs/glp1/how-does-glp1-work-mechanism-weight-loss) and [GLP-1 appetite suppression](https://www.telosrx.com/blogs/glp1/glp1-appetite-suppression-how-it-works). If semaglutide sounds like it fits what you are dealing with, the next step is a written intake reviewed by a licensed provider, with no appointment to schedule. [See semaglutide at Telos Rx](https://www.telosrx.com/pages/semaglutide) ## Does Semaglutide Work? What STEP 1 and SELECT Reported Two trials carry most of the weight here, both published in the New England Journal of Medicine. **STEP 1** randomized 1,961 adults with obesity or overweight and without diabetes to once-weekly semaglutide 2.4 mg or placebo for 68 weeks, alongside lifestyle intervention. [Mean change in body weight was -14.9% with semaglutide versus -2.4% with placebo](https://pubmed.ncbi.nlm.nih.gov/33567185/). Nausea and diarrhea were the most common adverse events and were typically transient. **SELECT** asked a different question: not how much weight, but whether events fall. It enrolled 17,604 adults with existing cardiovascular disease and overweight or obesity but no diabetes. [The primary composite endpoint occurred in 6.5% on semaglutide versus 8.0% on placebo, a hazard ratio of 0.80](https://pubmed.ncbi.nlm.nih.gov/37952131/). Two caveats. These are trial averages under trial conditions, not forecasts for any individual. And SELECT studied a specific higher-risk group, so its findings do not transfer automatically. More in [GLP-1 cardiovascular benefits research](https://www.telosrx.com/blogs/glp1/glp1-cardiovascular-benefits-research). ## Injection, Tablet, and What Compounded Actually Means Oral semaglutide is real and FDA-approved, which sets it apart from many "GLP-1 pill" claims online. The tablets use an absorption enhancer and are taken daily on an empty stomach with a sip of water, whereas the injection is weekly. Worth separating out: orforglipron, brand Foundayo, is also an oral GLP-1 pill, but it is a different molecule and is not semaglutide. Formats are compared in [the semaglutide pill guide](https://www.telosrx.com/blogs/glp1/semaglutide-pill-oral-guide) and [oral vs injectable semaglutide](https://www.telosrx.com/blogs/glp1/oral-vs-injectable-semaglutide-comparison). **Compounded semaglutide is not FDA-approved.** It is prepared by licensed US compounding pharmacies under federal compounding regulations, against a prescription written for an individual patient. It has not been through the agency's own review of safety and effectiveness, and its concentration and presentation can differ from the brand products. That route is covered in [compounded semaglutide via telehealth](https://www.telosrx.com/blogs/glp1/compounded-semaglutide-telehealth-2026) and [pens vs vials](https://www.telosrx.com/blogs/glp1/glp1-pens-vs-vials-guide). ## Dosing Is Gradual by Design Every semaglutide label starts low and steps up. Wegovy injection begins at 0.25 mg weekly and escalates through 0.5, 1 and 1.7 mg to a 2.4 mg maintenance dose, in four-week steps. Rybelsus runs 3 mg daily for 30 days, then 7 mg, with 14 mg an option after day 60. That titration is not caution for its own sake. Gastrointestinal side effects cluster during dose increases, and stepping up slowly is how the labels manage them. **These figures describe labels and trials. They are not instructions, and the prescribing provider decides what is appropriate.** Full schedule: [semaglutide dosage](https://www.telosrx.com/blogs/glp1/semaglutide-dosage-schedule). ## Safety: What the Label Flags Semaglutide carries a boxed warning for thyroid C-cell tumors, based on rodent studies. It is contraindicated in anyone with a personal or family history of medullary thyroid carcinoma or MEN 2, and it is not for use in pregnancy. The common adverse effects are gastrointestinal: nausea, vomiting, diarrhea and constipation, usually worst during titration and often easing with time. Less common but serious risks include pancreatitis and gallbladder disease. Detail lives in [semaglutide side effects](https://www.telosrx.com/blogs/glp1/semaglutide-side-effects-questions-answered) and [managing GLP-1 side effects](https://www.telosrx.com/blogs/glp1/how-to-manage-glp-1-side-effects-a-step-by-step-guide). Two things people underestimate: lean mass can fall alongside fat mass, covered in [muscle loss on semaglutide](https://www.telosrx.com/blogs/glp1/muscle-loss-on-semaglutide-lean-mass-glp1), and appetite effects generally depend on continued treatment, discussed in [stopping semaglutide](https://www.telosrx.com/blogs/glp1/stopping-semaglutide-weight-regain-glp1-guide). ## Semaglutide or Tirzepatide? Tirzepatide is the other molecule in this category, and it is not a semaglutide variant. It activates two receptors, GIP and GLP-1, and is sold as Mounjaro and Zepbound. See [what is tirzepatide](https://www.telosrx.com/blogs/glp1/what-is-tirzepatide-complete-guide), then [tirzepatide vs semaglutide](https://www.telosrx.com/pages/tirzepatide-vs-semaglutide). ## What a Provider Evaluation Involves Telos Rx is an online-first, asynchronous telehealth service and is LegitScript-certified. You complete a written intake covering health history, current medications and what you are hoping to address. A licensed provider reviews it and responds in writing, often within hours, without a scheduled appointment. Everything is subject to medical approval by a licensed provider, and approval is not guaranteed. If semaglutide is not suitable, the provider says so. As of publication, compounded semaglutide at Telos Rx is listed as low as $99 per month, with flat pricing that does not change as your dose is titrated, free 48-hour shipping if approved, FSA and HSA accepted, and cancellation at any time. Cost is broken down in [semaglutide cost](https://www.telosrx.com/blogs/glp1/semaglutide-cost-price-guide). ## Keep Reading: The Rest of This Guide - [Semaglutide Dosage: The Titration Schedule Explained](https://www.telosrx.com/blogs/glp1/semaglutide-dosage-schedule) - [Is Ozempic Semaglutide? Ozempic, Wegovy, Rybelsus and Compounded](https://www.telosrx.com/blogs/glp1/is-ozempic-semaglutide-explained) - [The Semaglutide Pill: Rybelsus, the Wegovy Pill and Compounded](https://www.telosrx.com/blogs/glp1/semaglutide-pill-oral-guide) - [Semaglutide Cost: Compounded vs Ozempic and Wegovy](https://www.telosrx.com/blogs/glp1/semaglutide-cost-price-guide) - [Semaglutide Side Effects: Questions Answered](https://www.telosrx.com/blogs/glp1/semaglutide-side-effects-questions-answered) - [How Long Does Semaglutide Take to Work?](https://www.telosrx.com/blogs/glp1/how-long-does-semaglutide-take-to-work-answers) - [What to Eat on Semaglutide](https://www.telosrx.com/blogs/glp1/what-to-eat-on-semaglutide-glp1-diet-guide) - [Semaglutide Benefits Beyond Weight Loss](https://www.telosrx.com/blogs/glp1/semaglutide-benefits-beyond-weight-loss) - [How to Start GLP-1 Therapy, Step by Step](https://www.telosrx.com/blogs/glp1/how-to-start-glp1-therapy-step-by-step) ## Frequently Asked Questions ### What is semaglutide used for? Semaglutide is FDA-approved under different brands for type 2 diabetes, for chronic weight management in adults with obesity or overweight plus a related condition, and for reducing cardiovascular event risk in certain adults. The Wegovy injection also carries an accelerated approval for MASH with moderate to advanced fibrosis. Compounded semaglutide is not FDA-approved. ### Is semaglutide the same as Ozempic? The active molecule is the same. Ozempic, Wegovy and Rybelsus all contain semaglutide, and they differ in approved indication, dose range and format rather than in the drug itself. Compounded semaglutide contains the same active ingredient but is not FDA-approved, and its concentration and presentation can differ from the brand products. ### Is semaglutide a peptide? Yes. Semaglutide is a modified analog of human GLP-1, a hormone your gut releases after eating. A fatty acid chain lets it bind to albumin in the blood, which slows breakdown enough to allow once-weekly injection instead of the few minutes native GLP-1 survives. It is a prescription drug, not a supplement. ### Does semaglutide work for weight loss? In STEP 1, published in the New England Journal of Medicine, participants on once-weekly semaglutide 2.4 mg had a mean body weight change of -14.9% at 68 weeks versus -2.4% on placebo, alongside lifestyle intervention. Those are trial averages under trial conditions, not a prediction for any individual, and results vary. ### Is there a semaglutide pill? Yes. Rybelsus tablets are FDA-approved for type 2 diabetes at 3, 7 and 14 mg once daily, and oral tablet forms of Ozempic and Wegovy also exist. Orforglipron, brand Foundayo, is a separate oral GLP-1 pill but a different molecule, not semaglutide. ### Who should not take semaglutide? Semaglutide carries a boxed warning for thyroid C-cell tumors seen in rodents and is contraindicated in anyone with a personal or family history of medullary thyroid carcinoma or MEN 2. It is not for use in pregnancy. History of pancreatitis, gallbladder disease and current medications are all part of the review by a licensed provider. _TelosRX is LegitScript-certified. Compounded medications are not FDA-approved and are prepared under federal compounding regulations. Approval is subject to evaluation by a licensed provider; approval is not guaranteed. Individual results vary. TelosRX operates as an online-first, asynchronous telehealth service._ Ready to find out whether semaglutide is a reasonable fit for you? Start with the [semaglutide product page](https://www.telosrx.com/pages/semaglutide), then complete the written intake for your evaluation: [start an online visit](https://start.telosrx.com/start-online-visit/weightloss). A licensed provider reviews every request, and approval is not guaranteed. **Tags:** compounded semaglutide, GLP-1, GLP-1 receptor agonist, Ozempic, Rybelsus, semaglutide, Wegovy, weight loss --- > Source: [Telos RX](https://www.telosrx.com/blogs/glp1/what-is-semaglutide-complete-guide)