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GLP-1 glossary: terms to understand your care

4 min read 2 sources
Jillian Foglesong Stabile, MD

Jillian Foglesong Stabile, MD, FAAFP, DABOM

Sipra Medical Reviewer

  • American Board of Family Medicine
  • American Board of Obesity Medicine
  • Wake Forest University School of Medicine

ReviewsPatient-facing health education

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Board-certified Family Medicine · Diplomate, ABOM · Medical reviewer of record · Updated Sep 16, 2026
In this guide

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.

GLP-1 receptor agonist
A medicine that activates the GLP-1 receptor, which is the docking point for that hormone. "Agonist" just means it switches the receptor on.

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.

In this guide

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.

Appetite signaling
The back-and-forth between gut and brain that decides hunger. GLP-1 medicines turn down the hunger side of that conversation.
In this guide

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.

Plateau
A period when a measured result, such as body weight, stops changing. Ask your clinician how to interpret it in your situation.
In this guide

Compounded vs branded: read this slowly

Branded GLP-1503A compounded preparation
Made byThe manufacturer, fixed formulationA state-licensed pharmacy, per prescription
Made forThe general approved populationOne named patient
RequiresA prescriptionA patient-specific prescription
How to think of itAn FDA-approved branded productA distinct preparation, not the brand and not equivalent to it
Safety note

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.

Safety note

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.

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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.

Keep a calm reference close.

In this guide

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.

Copay
A fixed amount a payer requires for a covered service or medicine. Confirm the amount and any eligibility conditions with the payer.
In this guide

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.

Safety note

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.

In this guide

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.

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Sources

  1. NIDDK. Prescription Medications to Treat Overweight & Obesity. Accessed September 14, 2026. niddk.nih.gov
  2. HealthCare.gov. Glossary of health coverage terms. Accessed September 14, 2026. healthcare.gov