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Semaglutide molecular helix rendering, glowing violet
File · C₁₈₇H₂₉₁N₄₅O₅₉Receptor · GLP-1RClass · Peptide analog

The molecule that
rewired appetite.

An independent, data-driven reading room for semaglutide — every trial, every price, every provider, sourced from the FDA, NIH and CMS. No affiliates. No promotions.

Trial subjects
37,559
across 26 RCTs
MACE reduction
−26%
SUSTAIN-6 · 104w
Mean weight Δ
−14.9%
STEP-1 · 68w
Cash floor
$199
503A compounded
STEP-1 · −14.9% body weight at 68 weeksSUSTAIN-6 · −26% MACESELECT · 17,604 patientsWegovy 2.4 mg · $1,349 / moOzempic 1.0 mg · $968 / moCompounded · from $199 / moFDA shortage · resolved 02.21.25Medicare Part D · 47% plan coverageHalf-life · ~7 daysReceptor · GLP-1R agonistSTEP-1 · −14.9% body weight at 68 weeksSUSTAIN-6 · −26% MACESELECT · 17,604 patientsWegovy 2.4 mg · $1,349 / moOzempic 1.0 mg · $968 / moCompounded · from $199 / moFDA shortage · resolved 02.21.25Medicare Part D · 47% plan coverageHalf-life · ~7 daysReceptor · GLP-1R agonist
§ 01 · The molecule

What it is, plainly.

ClassGLP-1 RA
Half-life~7 days
RouteSC / Oral
Approved2017 · 21 · 24
OriginatorNovo Nordisk

Semaglutide is a long-acting analogue of glucagon-like peptide-1, a hormone the gut secretes after a meal. By binding the GLP-1 receptor for roughly a week per injection, it slows gastric emptying, sharpens insulin response and dampens the brain's drive to eat. The compound was first approved for type-2 diabetes in 2017, then for chronic weight management in 2021, and most recently — after the 17,604-patient SELECT trial — for cardiovascular risk reduction in adults with obesity and established heart disease.

What follows is not a sales page. It is a reference. Six chapters, one drug, every claim sourced. Use the formulary to compare what you can actually buy. Use the evidence section to read the trials in plain language. Use the pricing tool to understand what an honest cash price looks like in your pharmacy.

§ 02 · The trial record
Explore all 26 trials →
−14.9%

Mean body weight reduction at week 68 in STEP-1 (n=1,961), 2.4 mg semaglutide vs −2.4% on placebo.

−26%

Reduction in major adverse cardiovascular events in SUSTAIN-6 over 104 weeks.

17,604

Patients enrolled in SELECT, the trial behind the 2024 cardiovascular indication.

~7d

Plasma half-life — the reason a single subcutaneous injection lasts a week.

A semaglutide injection pen photographed under deep violet light
Specimen 02 · pre-filled SC pen● rec
Fig. 2 — Pre-filled subcutaneous pen, the dominant delivery format since 2017.
Field note

The titration matters more than the dose.

Most adverse events — nausea, fatigue, injection-site reaction — concentrate in the first four weeks of escalation. Patients who follow the 16-week titration schedule report dramatically lower rates of discontinuation than those who jump to the maintenance dose early.

Open the titration guide →
§ 04 · A note on price

The honest answer is: it depends.

Wegovy's list price is $1,349 per month. Most patients with commercial insurance pay between $25 and $200. Most patients without coverage pay the list price unless they qualify for the manufacturer savings card. Compounded versions, while not FDA-approved, range from $199 to $450.

Open the pricing tool →
Aggregated pharmacy price feed visualization in violet
Pharmacy feed · 1,200 nodesΔ live
Fig. 3 — Aggregated cash-price feed across 1,200+ U.S. pharmacies, 2024–2026.
Colophon

Stop scrolling forums. Start with the literature.

Set in Instrument Serif and Inter. Composed in New York. Updated nightly from public datasets. Not affiliated with Novo Nordisk, any compounding pharmacy, or any telehealth platform.