GLP-1 glossary: terms to understand your care


The medicines: what is in the conversation
Oral GLP-1. A GLP-1 medicine taken by mouth. Approved uses and instructions depend on the exact product; check its current prescribing information.
GLP-1 (glucagon-like peptide-1). A natural gut hormone your body releases after you eat. It signals fullness to the brain and slows how fast the stomach empties. GLP-1 medications mimic this hormone.
Semaglutide. A GLP-1 receptor agonist. It acts on the single GLP-1 pathway. It is the molecule inside several branded weight and diabetes products.
The biology: how it works in the body
Satiety. The feeling of being full and satisfied. GLP-1 medicines raise satiety, so meals feel like enough sooner.
Gastric emptying. How fast food leaves your stomach. These medicines slow it, which is part of why appetite drops and why early fullness is common.
The process: words you will hear during care
Off-label. Use of an approved medicine for a use not listed in its approved labeling. A clinician assesses whether a particular use is appropriate.
Maintenance dose. The steady dose a clinician may settle on after the titration period. It is the level meant to be held over time, not the starting point.
Compounded vs branded: read this slowly
| Branded GLP-1 | 503A compounded preparation | |
|---|---|---|
| Made by | The manufacturer, fixed formulation | A state-licensed pharmacy, per prescription |
| Made for | The general approved population | One named patient |
| Requires | A prescription | A patient-specific prescription |
| How to think of it | An FDA-approved branded product | A distinct preparation, not the brand and not equivalent to it |
Contraindication. A specific reason a medicine should not be used for someone. Screening for contraindications is part of what a prescribing clinician does before any GLP-1 is on the table.
Titration means adjusting a medicine’s dose according to a clinician’s plan. Do not change it yourself.
Compounded medication. A medicine prepared by a state-licensed pharmacy for a specific patient under a patient-specific prescription. It is a distinct preparation. It is not a branded product, and it is not equivalent to one.

Active ingredient. The component in a medicine that does the work. Whether two products share an active ingredient is a regulatory and clinical question, so the honest move is to read the label and ask your pharmacist and clinician, not to assume.
Cost and insurance: the words that protect you
Negative option. A billing arrangement that continues until canceled. Read the recurring amount, timing and cancellation terms before agreeing.
Full cost disclosure. Showing you the total price, the recurring charge, and how to cancel, all before your card is charged. A clear provider gives you every number in writing first.
Safety: the words worth knowing before you start
Boxed warning. The most prominent type of FDA label warning. Warnings differ by product; your clinician can explain those on your prescribed medicine.
Pancreatitis. Inflammation of the pancreas. A clinician can explain whether a warning about this condition applies to your prescribed medication.
Clinical trial. A research study that tests an intervention in a defined group. Results from that group do not predict an individual outcome.
GI side effects. Digestive symptoms such as nausea or constipation. Discuss new or concerning symptoms with the clinician managing your treatment.
Keep this list close
Bookmark the terms relevant to your questions, then discuss them with your clinician or the provider handling your payment.
Bring your questions to a licensed clinician. A glossary explains words. A clinician applies them to you. That is the line this article will not cross.
Read any pricing page with the cost words in hand
Full cost, recurring charge, online cancellation, in writing, before your card is charged. If they are missing, keep looking.
Lose weight with a plan made just for you
- Same-day doctor visits and prescriptions
- Semaglutide, tirzepatide & other GLP-1s
- FSA & HSA eligible with all plans

From price shown is the 12-month plan rate. Prices may vary.
Frequently asked questions
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Sources
- NIDDK. Prescription Medications to Treat Overweight & Obesity. Accessed September 14, 2026. niddk.nih.gov
- HealthCare.gov. Glossary of health coverage terms. Accessed September 14, 2026. healthcare.gov