Semaglutide has become one of the most talked-about medications in recent years — and for good reason. Clinical trials showed average weight loss of 15% or more of body weight, outperforming any previous medication in its class.
But what exactly is it, how does it work, and is it right for you? Here's what you need to know.
What Is Semaglutide?
Semaglutide is a GLP-1 receptor agonist — a class of medications that mimic a hormone your gut naturally produces called glucagon-like peptide-1 (GLP-1). This hormone is released after you eat and plays several roles in blood sugar regulation and appetite control.
Semaglutide is not insulin. It does not directly lower blood sugar on its own but works through a different mechanism that makes blood sugar regulation easier, particularly for people with type 2 diabetes.
It is sold under several brand names depending on its intended use:
| Brand name | Approved use | Form |
|---|---|---|
| Ozempic | Type 2 diabetes | Weekly injection |
| Wegovy | Chronic weight management | Weekly injection |
| Rybelsus | Type 2 diabetes | Daily oral tablet |
How Does Semaglutide Work?
When you inject or take semaglutide, it binds to GLP-1 receptors throughout your body and does several things simultaneously:
Slows gastric emptying. Food moves more slowly from your stomach to your small intestine. This keeps you feeling fuller for longer after meals.
Reduces appetite signaling. Semaglutide crosses into the brain and acts on receptors in the hypothalamus — the region that regulates hunger — dampening appetite signals and reducing the drive to eat.
Improves blood sugar regulation. It stimulates insulin release when blood sugar is elevated and suppresses glucagon (which raises blood sugar), which is why it was first developed as a diabetes drug.
The combination of these effects — less hunger, earlier satiety, and steadier blood sugar — is what produces sustained weight loss in most people who respond well to the medication.
Dosing and Titration
Semaglutide is always started at a low dose and increased gradually over several months. This process, called titration, is designed to minimize side effects (particularly nausea) while your body adjusts.
The standard Wegovy titration schedule is:
- Months 1–4: 0.25 mg → 0.5 mg → 1 mg → 1.7 mg (stepping up monthly)
- Month 5 onward: 2.4 mg (maintenance dose)
Most providers follow the same protocol whether prescribing brand-name Wegovy or compounded semaglutide. If side effects are significant at any step, your provider may hold the dose at that level for an extra month before increasing.
Side Effects
The most common side effects are gastrointestinal and tend to be most pronounced during dose increases:
- Nausea (most common, affects 40–50% of users)
- Vomiting
- Diarrhea or constipation
- Heartburn or indigestion
- Stomach pain
These typically improve as your body adjusts. Most people find they're manageable — especially when eating smaller, lower-fat meals and avoiding lying down after eating.
Serious but rare side effects to be aware of:
- Pancreatitis (discontinue and seek care if you have severe abdominal pain)
- Gallbladder problems
- Increased heart rate
- Semaglutide carries an FDA boxed warning about a theoretical risk of thyroid C-cell tumors based on animal studies; avoid it if you have a personal or family history of medullary thyroid carcinoma (MTC) or MEN2 syndrome
Always discuss your full medical history with your prescribing provider.
Who Qualifies for Semaglutide?
For the Wegovy indication (weight loss), FDA approval covers adults who have:
- A BMI of 30 or higher, or
- A BMI of 27 or higher with at least one weight-related condition (high blood pressure, type 2 diabetes, or high cholesterol)
Most online telehealth providers follow these same criteria when prescribing. Some may use slightly different thresholds for compounded semaglutide — always read the eligibility requirements carefully.
Brand Name vs. Compounded Semaglutide
Wegovy is the FDA-approved brand. It has gone through full clinical trials and quality manufacturing controls. The downside: it has historically been in short supply and expensive without insurance (~$1,300/month retail).
Compounded semaglutide is made by licensed compounding pharmacies. It became widely available when Wegovy was on the FDA shortage list. It is not FDA-approved but is legal under shortage provisions. It's typically much cheaper ($150–$400/month) and is what most online GLP-1 telehealth providers prescribe.
Important: As of 2025, the FDA removed semaglutide from the shortage list, which means compounding pharmacies are no longer permitted to compound it for most patients. Many telehealth providers have shifted to tirzepatide or are dispensing generic/authorized alternatives. Check with your provider for the most current options.
What to Expect in the First Month
Most people notice:
- Week 1–2: Little change in appetite; possible mild nausea
- Week 3–4: Reduced hunger between meals; portion sizes may naturally decrease
- Month 1 weight loss: Typically 1–4 lbs — don't expect dramatic changes at the starting dose
The medication's full effect builds gradually over the titration period. Most clinical trials tracked results at 68 weeks (about 16 months), which is where the 15%+ weight loss figures come from.