Semaglutide for weight loss: a complete guide
Semaglutide is a GLP-1 receptor agonist that supports weight loss by mimicking a gut hormone that slows stomach emptying and signals fullness to the brain, so you eat less. Taken as a once-weekly injection with gradual dose increases, it is prescribed by a licensed provider alongside diet and activity changes.
What semaglutide is and how it works
Semaglutide is a GLP-1 receptor agonist. It imitates glucagon-like peptide-1 (GLP-1), a natural hormone your gut releases after eating that helps regulate appetite and blood sugar.
For weight management, semaglutide acts on appetite centers in the brain and slows how quickly the stomach empties. The result is reduced hunger and earlier fullness, which typically lowers overall calorie intake. It is used together with a reduced-calorie diet and increased physical activity, not as a replacement for them.
How it's taken and titration
Brand semaglutide for weight management (Wegovy) is a once-weekly injection under the skin. Providers start at a low dose and increase it in steps over several weeks — a process called titration — to reduce gastrointestinal side effects while the body adjusts.
Your provider determines your schedule and target dose. Never adjust your dose on your own, and follow the specific instructions you receive with your prescription.
Common side effects
The most common side effects are gastrointestinal and often ease as your body adjusts to the medication:
- Nausea, vomiting, and diarrhea
- Constipation and abdominal pain
- Indigestion, gas, and burping
- Headache, fatigue, or dizziness
Boxed warning and key contraindications
Semaglutide carries an FDA boxed warning — the agency's most serious warning. In animal studies it caused thyroid C-cell tumors; whether it causes these tumors, including medullary thyroid carcinoma (MTC), in humans is not known.
Because of this risk, semaglutide is contraindicated in anyone with a personal or family history of medullary thyroid carcinoma and in people with Multiple Endocrine Neoplasia syndrome type 2 (MEN 2). It should also not be used by people with a known serious allergy to semaglutide. Report symptoms like a neck lump, trouble swallowing, hoarseness, or shortness of breath to a provider. Serious risks reported with GLP-1 medicines include pancreatitis, gallbladder problems, and, in people with diabetes on other glucose-lowering drugs, low blood sugar.
Who is and isn't a candidate
GLP-1 weight-management medicines are generally considered for adults with obesity, or with overweight plus a weight-related condition, when clinically appropriate. A licensed provider reviews your health history to decide whether treatment is suitable for you.
It is not appropriate for people with the contraindications above, and it is not used during pregnancy or while trying to become pregnant. Only a licensed provider can determine candidacy — this page is educational and does not establish that any treatment is right for you.
Compounded vs. brand semaglutide
Brand semaglutide products (such as Wegovy and Ozempic) are FDA-approved, meaning the FDA reviewed their manufacturing, safety, and effectiveness.
Compounded semaglutide is prepared by a licensed compounding pharmacy for an individual patient. Compounded medications are NOT FDA-approved: the FDA does not review them for safety, effectiveness, or quality, and they are not a generic version of or a substitute for the brand product. A licensed provider decides whether any medication, brand or compounded, is appropriate and will discuss the differences with you.
Am I eligible for semaglutide?
Eligibility is decided by a licensed provider who reviews your health history, current medications, and goals. GLP-1 medicines are generally considered for adults with obesity, or overweight plus a weight-related condition, when clinically appropriate. This page can't determine eligibility for you.
What are the most common side effects?
Most are gastrointestinal — nausea, vomiting, diarrhea, constipation, and abdominal pain — and often ease as your body adjusts. Serious risks include thyroid C-cell tumors (see the boxed warning), pancreatitis, and gallbladder problems. Discuss any symptoms with your provider.
How much weight can I expect to lose?
Results vary by person and depend on diet, activity, and adherence. In the STEP 1 clinical trial (Wilding et al., NEJM 2021), adults without diabetes taking once-weekly semaglutide 2.4 mg lost meaningfully more weight than those on placebo, alongside lifestyle changes. Your own results cannot be predicted from a trial average.
Is compounded semaglutide the same as Wegovy or Ozempic?
No. Compounded semaglutide is prepared by a licensed compounding pharmacy and is NOT FDA-approved — the FDA does not review it for safety, effectiveness, or quality. It is not a generic version of, or a substitute for, the brand products. A licensed provider will discuss which option, if any, is appropriate for you.
How do I get started with Medivive?
You start with a short conversation — not a quiz. Tell us about your goals in your own words, and if it looks like a potential fit, we connect you with a licensed provider who reviews your information and decides whether treatment is appropriate. No prescription is guaranteed.