How Does Semaglutide (Ozempic, Wegovy) Work? Mechanism of Action Explained

Direct Answer

Semaglutide works by activating GLP-1 receptors, mimicking the body's natural GLP-1 hormone. This produces three main effects: stimulating insulin release when blood sugar is elevated, slowing gastric emptying so food digests more gradually, and signaling fullness to the brain to reduce appetite. Semaglutide's roughly 7-day half-life, the longest among single-target GLP-1 medications, is what allows once-weekly dosing.

Drug Class and Indications

Semaglutide belongs to the GLP-1 receptor agonist class. As Ozempic, it's indicated for blood sugar control in type 2 diabetes and cardiovascular risk reduction. As Wegovy, at a higher maximum dose, it's indicated for chronic weight management, and has additional approvals for cardiovascular risk reduction and MASH.

How It Compares to Other GLP-1 Medications

Semaglutide is a single-target GLP-1 receptor agonist, activating only the GLP-1 receptor, unlike tirzepatide (dual GLP-1/GIP) or investigational retatrutide (triple GLP-1/GIP/glucagon). This generally means somewhat lower average weight loss in trials compared to those newer, multi-receptor medications, but semaglutide has the longest track record of real-world use and outcome data of any current-generation GLP-1 medication.

Bottom Line

Semaglutide's single-receptor mechanism and long half-life make it a well-established, thoroughly studied option, the foundation the newer, multi-receptor medications were built on top of.

References

• Ozempic and Wegovy Prescribing Information (FDA)

Related Resources

• Semaglutide Medication Guide

Related Articles

• Semaglutide vs. Tirzepatide

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