Topic
How do GLP-1 medications actually work?
The science of GLP-1, GIP and the incretin drugs, in plain English.
How Does Mounjaro Work? The Science Behind Tirzepatide, in Plain EnglishMounjaro is tirzepatide, a once-weekly injection for type 2 diabetes that copies two gut hormones instead of one. Here is what it does to insulin, glucagon, your stomach and your appetite, straight from the FDA label and the research behind it.How Does Semaglutide Work? The Mechanism, Explained SimplySemaglutide is a lab-modified copy of a gut hormone that tells your pancreas to release insulin, tells your liver to hold back sugar, slows your stomach, and signals fullness to your brain - and the modifications let one dose last about a week.How Does Zepbound Work? GIP and GLP-1 ExplainedZepbound is tirzepatide, the same molecule as Mounjaro, approved for weight management and sleep apnea. It activates two gut hormone receptors - GIP and GLP-1 - and this guide explains what each one does to appetite, fat tissue and the brain.How Long Does Semaglutide Stay in Your System?The FDA label answers this directly: with a half-life of about one week, semaglutide stays in your circulation for roughly five weeks after your last dose - which shapes everything from side effects to surgery to pregnancy planning.How Long Does Tirzepatide Stay in Your System?Tirzepatide has a half-life of about five days, so after a last dose it takes roughly three and a half to four weeks to clear. Here is what the label says about half-life, steady state, missed doses, washout and what happens when you stop.Oral vs Injectable Semaglutide: What's the Difference in 2026?Same molecule, three US brand names across five presentations, two completely different journeys into the bloodstream - and a 2026 rebranding that means Ozempic now comes as both a pen and a pill that are not interchangeable.Semaglutide vs Tirzepatide: How the Two Drugs Actually DifferSemaglutide hits one receptor, tirzepatide hits two - and in the only head-to-head trial, tirzepatide produced more weight loss, though the two molecules differ in more ways than a single number captures.Tirzepatide and Birth Control: What the Label Actually SaysMounjaro and Zepbound are the only once-weekly GLP-1-family drugs whose US labels carry a specific oral contraceptive warning. Here is the exact wording, the study numbers behind it, and how it differs from semaglutide.What Is GIP, and Why Does It Matter for Weight Loss Drugs?GIP is the other incretin hormone - the one most people have never heard of. It was written off as useless for decades, then tirzepatide made it matter. Here is what GIP does, why the science is confusing, and why two companies are going in opposite directions with it.What Is GLP-1? A Plain English Guide to the Hormone Behind OzempicGLP-1 is a hormone your intestines release after you eat that helps control blood sugar and tells your brain you have had enough - and the entire Ozempic and Wegovy class of drugs exists to copy it.Who Discovered GLP-1 Drugs? The Real History Behind OzempicThe story runs from a 1902 dog experiment to a Gila monster in Arizona to five scientists sharing the 2025 Breakthrough Prize - and no, Ozempic is not made from lizard venom.