Medical weight loss has finally caught up with what so many of our patients in Sioux City already knew — willpower alone isn't the problem. Biology is. Two prescription medications, tirzepatide and semaglutide, have transformed how we help patients lose meaningful weight and keep it off. Both were originally developed for type 2 diabetes. Both are now used widely for weight management. And both work — but they don't work in exactly the same way.
If you've been researching GLP-1 medications, you've probably seen a lot of hype and a lot of conflicting information. This guide is the plain-English version: what each medication is, how they're different, and how our team at Prosper Health & Aesthetics helps you decide which one fits your body, your goals, and your budget.
What Is Semaglutide?
Semaglutide is a once-weekly injectable medication in a class of drugs called GLP-1 receptor agonists. In plain terms, it mimics a hormone your body already makes (glucagon-like peptide-1) that tells your brain you're full, slows how quickly your stomach empties, and helps stabilize blood sugar. The result for most patients is a noticeable drop in appetite, fewer food cravings, and steady, sustainable weight loss over several months.
Semaglutide is the active ingredient in brand-name medications like Ozempic and Wegovy. At Prosper, we also offer compounded semaglutide as part of our medical weight loss program, which allows us to keep pricing transparent and predictable.
What Is Tirzepatide?
Tirzepatide is a newer medication that works on two hormone pathways instead of one. It's called a dual GIP/GLP-1 receptor agonist, meaning it activates both GLP-1 (like semaglutide does) and GIP (glucose-dependent insulinotropic polypeptide). That second pathway appears to give tirzepatide an edge — most head-to-head data suggests patients on tirzepatide lose more weight, on average, than patients on semaglutide at comparable doses.
Tirzepatide is the active ingredient in Mounjaro and Zepbound. We offer it in both injectable and oral forms at our Sioux City clinic.
Tirzepatide vs. Semaglutide: The Real Differences
Mechanism. Semaglutide works on one receptor (GLP-1). Tirzepatide works on two (GLP-1 and GIP). That extra pathway is why tirzepatide tends to produce more weight loss in clinical trials.
Average weight loss. In the SURMOUNT-1 and STEP trials, tirzepatide patients lost an average of roughly 20 to 22 percent of their body weight at the highest dose over 72 weeks. Semaglutide patients lost around 15 percent. Individual results vary significantly — genetics, starting weight, diet, sleep, and hormone health all play a role.
Dosing. Both are dosed once weekly and titrated slowly upward to minimize side effects.
Side effects. Both medications share a similar side effect profile: nausea, constipation, reflux, and occasional fatigue, especially in the first few weeks or after a dose increase. Most side effects fade as your body adjusts. We start low and go slow on purpose.
Cost. Semaglutide is typically a few hundred dollars less per month than tirzepatide. At Prosper, compounded semaglutide starts at $225 per month and compounded tirzepatide starts at $349 per month, with no insurance hassles and no surprise fees.
How We Help You Choose
Choosing between tirzepatide and semaglutide isn't a coin flip. It's a clinical decision based on your medical history, current medications, starting weight, weight loss goals, tolerance for side effects, and budget. Our nurse practitioners review all of that during your consultation and build a plan around you — not around a script.
For many patients, we start with semaglutide. If weight loss stalls or if you want a more aggressive option from day one, tirzepatide may be the better fit. If injections aren't your thing, we also offer oral tirzepatide as a needle-free alternative.
What Patients Actually Should Consider
Both medications are powerful tools. They are not shortcuts. The patients who see the best long-term results pair their GLP-1 with protein-forward nutrition, strength training, quality sleep, and — when appropriate — hormone optimization. That's the whole reason Prosper exists as a direct-pay medical clinic: we have time to treat the whole person, not just write a prescription and send you on your way.
Ready to Start?
If you're in Sioux City, South Sioux City, Sergeant Bluff, Le Mars, Dakota City, Storm Lake, or anywhere in Siouxland, our medical weight loss team would love to meet you. Book a consultation at our contact page or call us at 712-639-6304. Members of our weight loss memberships get bundled monthly pricing on consults, follow-ups, and medication.