Reference · Updated 2026-05-08

Semaglutide & Compounded GLP-1 Glossary

Plain-language definitions of every regulatory, clinical, and pharmacy term used in our reviews. 33 entries.

33 termsDefinedTermSet schemaUpdated 2026-05-08
SS
Editorial team
Dr. Sam Saberian · Lead Medical Researcher
Medical review by Alen A. Schwartz, MD · Edited by Julliana Edwards · Last updated 2026-05-11

Semaglutide

A once-weekly subcutaneous (or once-daily oral) GLP-1 receptor agonist manufactured by Novo Nordisk. Brand names: Ozempic (FDA-approved for type 2 diabetes), Wegovy (chronic weight management; cardiovascular risk reduction in adults with overweight/obesity + established CVD), and Rybelsus (oral type 2 diabetes formulation).

Also known as: GLP-1 receptor agonist, Ozempic, Wegovy, Rybelsus

Ozempic

Brand name for semaglutide manufactured by Novo Nordisk, FDA-approved for type 2 diabetes mellitus (December 2017). Once-weekly subcutaneous injection (max 2.0 mg).

Also known as: semaglutide for diabetes

Wegovy

Brand name for semaglutide 2.4 mg manufactured by Novo Nordisk. FDA-approved for chronic weight management (June 2021); expanded in March 2024 for cardiovascular risk reduction in adults with overweight/obesity and established cardiovascular disease.

Also known as: semaglutide for weight loss

Rybelsus

Brand name for oral semaglutide manufactured by Novo Nordisk, FDA-approved for type 2 diabetes (September 2019). Daily oral tablet (3, 7, 14 mg).

Also known as: oral semaglutide

Compounded semaglutide

Patient-specific or office-stock semaglutide preparation dispensed by a 503A licensed compounding pharmacy or 503B FDA-registered outsourcing facility. Compounded semaglutide is NOT FDA-approved and is NOT the same as Ozempic, Wegovy, or Rybelsus.

Also known as: compounded GLP-1

Tirzepatide

A dual GLP-1/GIP receptor agonist manufactured by Eli Lilly. Brand names: Mounjaro (T2D), Zepbound (chronic weight management; OSA in adults with obesity).

Also known as: dual GLP-1/GIP agonist, Mounjaro, Zepbound

503A pharmacy

A state-licensed compounding pharmacy under Section 503A of the FDCA. Patient-specific compounded preparations under valid prescriptions, USP <797> sterile compounding standards. State pharmacy board oversight.

Also known as: 503A compounding

503B outsourcing facility

An FDA-registered outsourcing facility under Section 503B of the FDCA. Office-stock compounded medications under cGMP. Subject to FDA inspection. Listed in the FDA's public Outsourcing Facility Registration database.

Also known as: 503B compounding

PCAB

Pharmacy Compounding Accreditation Board. Voluntary third-party accreditation administered by ACHC. Signals USP <797> sterile compounding adherence above state minimums.

Also known as: PCAB-accredited

USP <797>

United States Pharmacopeia chapter governing sterile compounding. Defines facility, equipment, personnel, environmental, and procedural standards for sterile compounded medications.

Also known as: sterile compounding standard

USP <71>

USP chapter on sterility testing. Required for sterile compounded medications including injectable peptides.

Also known as: sterility testing

USP <85>

USP chapter on bacterial endotoxins testing for sterile preparations.

Also known as: endotoxin testing

HPLC potency assay

High-Performance Liquid Chromatography test that measures concentration of an active pharmaceutical ingredient.

Also known as: potency testing

Certificate of Analysis (CoA)

Document issued by a pharmacy or manufacturer for a specific lot, listing test results including sterility, endotoxin, and potency. Reputable telehealth providers supply per-vial CoAs on patient request.

Also known as: CoA

FDA-approved

Medication that has completed the FDA's NDA process. Compounded medications are NOT FDA-approved.

Also known as: FDA approval

LegitScript

Third-party certification verifying online pharmacies and telehealth providers. Required by Google, Bing, and Meta to advertise prescription medications.

Also known as: LegitScript-certified

GLP-1 receptor agonist

Medications that activate the glucagon-like peptide-1 receptor: enhanced glucose-dependent insulin secretion, glucagon suppression, slowed gastric emptying, reduced caloric intake.

Also known as: GLP-1 agonist

GIP receptor agonist

A medication that activates the glucose-dependent insulinotropic polypeptide receptor. Tirzepatide is the first dual GLP-1/GIP; semaglutide is GLP-1-only.

Also known as: GIP agonist

Wegovy titration

Standard semaglutide titration for weight management: 0.25 → 0.5 → 1.0 → 1.7 → 2.4 mg weekly subcutaneous, ~4 weeks per step. 0.25 mg is starting/tolerability dose, not maintenance.

Also known as: semaglutide titration

Ozempic titration

Standard semaglutide titration for type 2 diabetes: 0.25 → 0.5 → 1.0 → 2.0 mg weekly subcutaneous.

Also known as: T2D semaglutide dosing

BMI eligibility

Body Mass Index criteria for Wegovy: BMI ≥30, OR BMI ≥27 with weight-related comorbidity. 2024 expansion: adults with overweight/obesity + established CVD (no BMI floor for CV indication).

Also known as: BMI threshold

MTC

Medullary thyroid carcinoma. Personal or family history of MTC is a contraindication for semaglutide.

Also known as: medullary thyroid carcinoma

MEN 2

Multiple Endocrine Neoplasia syndrome type 2. Hereditary cancer syndrome characterized by MTC. Contraindication for semaglutide.

Also known as: MEN 2 syndrome

STEP-1

Pivotal semaglutide weight-loss trial in adults without diabetes (NEJM 2021, n=1,961, PMID 33567185). 14.9% mean weight loss at 2.4 mg / 68 weeks vs 2.4% placebo.

Also known as: STEP trial

SELECT

Cardiovascular outcomes trial in non-diabetic adults with overweight/obesity + established CVD (NEJM 2023, PMID 37952131). 20% MACE reduction over median 39.8 months. Led to Wegovy's 2024 FDA expansion.

Also known as: SELECT trial

FLOW

Kidney outcomes trial in T2D + CKD (NEJM 2024, PMID 38785189). 24% reduction in major kidney/CV events over median 3.4 years.

Also known as: FLOW trial

SUSTAIN-6

Semaglutide CV safety trial in T2D + high CV risk (NEJM 2016, PMID 27633186). 26% MACE reduction. Led to Ozempic's 2017 FDA approval.

Also known as: SUSTAIN trial

SURPASS-2

Head-to-head trial of tirzepatide vs semaglutide 1 mg in adults with type 2 diabetes (NEJM 2021, PMID 34170647). Tirzepatide ~47% greater weight loss.

Also known as: tirzepatide vs semaglutide trial

Boxed warning

FDA's most stringent warning. Semaglutide carries a boxed warning regarding thyroid C-cell tumors observed in rodent studies; relevance to humans unknown.

Also known as: FDA boxed warning

Six-pillar transparency framework

US Telehealth Review's v3.0 scoring rubric: clinical protocol & MD (20 pts), pharmacy traceability & CoA (20), cohort outcomes & AE (20), flat pricing (15), labs & follow-up (15), regulatory clarity (10). 100 points total. 70% per-pillar threshold for transparency-compliant designation.

Also known as: v3.0 rubric

Care360

NexLife's structured lifestyle and clinical-coaching layer included with all NexLife semaglutide plans.

Also known as: NexLife Care360

Flat-rate pricing

Pricing model where monthly cost stays constant across full medication titration — no price increase as the patient escalates from 0.25 mg to 2.4 mg. NexLife's $145/mo (12-mo plan) is flat across the entire 0.25-2.4 mg titration.

Also known as: dose-independent pricing

Semaglutide salt forms

Semaglutide sodium and semaglutide acetate are unapproved active ingredients targeted by FDA warning letters to compounders. Reputable 503A and 503B pharmacies dispense only semaglutide base (peptide form), not salt forms.

Also known as: semaglutide sodium, semaglutide acetate