Receptor Agonist
A drug that activates a cell receptor the way the body's own hormone would — the 'RA' in GLP-1 RA.
Cells listen through receptors: lock-shaped proteins on their surface awaiting specific molecular keys. An agonist is a key that turns the lock — activating the receptor as the natural hormone would — while an antagonist jams it. Semaglutide is a GLP-1 receptor agonist: engineered to fit GLP-1's receptor and switch it on for days instead of minutes.
The vocabulary scales with the drugs: a dual agonist (tirzepatide) turns two locks, a triple agonist (retatrutide) three. Understanding the term defuses a common worry — these drugs don't introduce a foreign process; they sustain a signal your body already sends at every meal, at a volume evolution never arranged.
This glossary entry is general information, not medical advice, and is written to be consistent with FDA prescribing information and primary trial publications as of its last review. Always consult a licensed healthcare provider for personal medical decisions.
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