Semaglutide

Semaglutide is a prescription GLP-1 receptor agonist medication approved by the FDA and sold as Ozempic and Rybelsus for type 2 diabetes and Wegovy for chronic weight management. It is a prescription drug, not a research chemical, and must be obtained and used under the supervision of a licensed clinician. This page is purely educational and is not medical advice.

Important: Unlike the research peptides elsewhere in this library, semaglutide is an approved medicine. WikiPeps does not sell it, does not provide dosing or sourcing guidance, and does not instruct self-administration. The goal here is to help you understand the drug so you can have a better conversation with your prescriber.

What is semaglutide?#

Semaglutide is a GLP-1 (glucagon-like peptide-1) receptor agonist — a medication that mimics a natural hormone released in the gut after eating. By activating GLP-1 receptors, it helps regulate blood sugar and appetite. It is the active ingredient in the brand-name products Ozempic, Rybelsus, and Wegovy, and it is FDA-approved.

What is semaglutide used for?#

Its approved uses depend on the specific product, and a prescribing clinician matches the product to the patient.

Eligibility, indication, and dosing are clinical decisions. Using a diabetes product for weight loss, or vice versa, is something only a prescriber should determine.

How does semaglutide work?#

Semaglutide activates GLP-1 receptors, which in turn:

• Stimulate insulin release when blood sugar is high.
• Reduce glucagon secretion (a hormone that raises blood sugar).
• Slow gastric emptying, so food leaves the stomach more slowly.
• Act on appetite centers in the brain to increase satiety.

Its long half-life of about one week is what allows the injectable forms to be dosed weekly.

How is semaglutide administered?#

This section is descriptive only — it is not instruction to self-inject. Injectable semaglutide (Ozempic, Wegovy) is supplied as a manufacturer prefilled pen designed for once-weekly subcutaneous injection, typically into the abdomen, thigh, or upper arm. Patients are trained directly by their clinician or pharmacist, and the pen, needles, and storage are handled per the manufacturer's instructions for use. Rybelsus is a daily oral tablet taken on an empty stomach with a small sip of water.

Because semaglutide pens are finished, FDA-regulated products, there is no patient reconstitution step the way there is with lyophilized research peptides. The pen is used as supplied.

What are the side effects and risks?#

Commonly reported side effects include nausea, vomiting, diarrhea, constipation, and abdominal discomfort, particularly when starting or increasing the dose. The prescribing information also describes more serious considerations, including a boxed warning about thyroid C-cell tumors observed in rodents (it is contraindicated in people with a personal or family history of medullary thyroid carcinoma or MEN 2), and potential risks such as pancreatitis, gallbladder problems, and hypoglycemia when combined with other diabetes medicines. Only a prescribing clinician can weigh these risks for an individual.

Why does counterfeit and compounded semaglutide matter?#

Because demand is high, the FDA has warned about counterfeit and improperly compounded semaglutide products, including dosing errors and unverified ingredients. The safest path is a legitimate prescription filled at a licensed pharmacy. WikiPeps strongly discourages sourcing prescription drugs outside the regulated system and does not facilitate it.

The bottom line#

Semaglutide (Ozempic, Wegovy, Rybelsus) is an FDA-approved prescription GLP-1 medication for type 2 diabetes and chronic weight management. It is a real medicine with real risks, not a research chemical, and it should only be obtained with a valid prescription and used under a licensed clinician's supervision. Use this page to understand it and to ask your prescriber informed questions.