If you’ve been researching medical weight loss, you’ve probably seen two names over and over: semaglutide and tirzepatide. Both are once-weekly injectable medications that lower appetite and support meaningful weight loss. The main difference is that semaglutide acts on one gut hormone pathway (GLP-1), while tirzepatide acts on two (GLP-1 and GIP). In head-to-head research, tirzepatide produced more average weight loss. But the “right” one depends on your health history, how your body tolerates the medication, cost and your goals. That’s a decision best made with a provider who knows you.
Maybe a friend at church lost 30 pounds on one of them. Maybe your sister swears by the other. Or maybe you just keep seeing the ads and wondering whether either one could finally help, after years of doing “everything right” without the scale moving.
At All About You Wellness & Aesthetics in Kalispell, it’s one of the questions we hear most often. So let’s walk through what each medication is, how they compare and what to ask before you choose.
What Is Semaglutide?
Semaglutide belongs to a class of medications called GLP-1 receptor agonists. GLP-1 (glucagon-like peptide-1) is a hormone your gut releases after you eat. It tells your brain you’re full, slows how quickly your stomach empties, and helps regulate blood sugar.
Semaglutide mimics that hormone, and its effect lasts much longer than your body’s own GLP-1. The result, for many people, is:
- Feeling satisfied with smaller portions
- Less “food noise,” the constant background thinking about food
- Fewer cravings between meals
- More stable blood sugar
Semaglutide was first approved to treat type 2 diabetes. At a higher dose, a brand-name version is now FDA-approved for chronic weight management. In the landmark STEP 1 trial, adults taking semaglutide 2.4 mg weekly, along with lifestyle changes, lost an average of about 14.9% of their body weight over 68 weeks, compared with 2.4% on placebo (Wilding et al., NEJM, 2021).
If you’d like a deeper look at how semaglutide works, plus the role nutrient and hormone deficiencies can play, see our earlier article, Understanding Semaglutide: A Breakthrough in Weight Loss and Nutrient Deficiencies.
What Is Tirzepatide?
Tirzepatide is newer and works a little differently. It’s a dual GIP and GLP-1 receptor agonist, which means it mimics two gut hormones instead of one.
GIP (glucose-dependent insulinotropic polypeptide) is another hormone released after meals. Researchers believe that activating GIP alongside GLP-1 may add to the effects on appetite, insulin response and how the body handles energy. That may help explain why tirzepatide has produced larger average weight loss in studies.
Brand-name versions of tirzepatide are FDA-approved for type 2 diabetes and for chronic weight management. In the SURMOUNT-1 trial, adults on the highest dose (15 mg weekly) lost an average of about 20.9% of their body weight over 72 weeks, compared with 3.1% on placebo (Jastreboff et al., NEJM, 2022).
Semaglutide vs. Tirzepatide: How Do They Compare Side by Side?
Here’s a quick comparison of the two medications as they’ve been studied for weight loss:
| Semaglutide | Tirzepatide | |
|---|---|---|
| Drug class | GLP-1 receptor agonist | Dual GIP + GLP-1 receptor agonist |
| Hormone pathways | One | Two |
| How it’s taken | Once-weekly injection | Once-weekly injection |
| Dose increases | Gradual, over about 16–20 weeks | Gradual, every 4 weeks |
| Average weight loss in its main trial | ~15% at 68 weeks | ~15–21% at 72 weeks, depending on dose |
| Head-to-head (SURMOUNT-5) | 13.7% at 72 weeks | 20.2% at 72 weeks |
| Most common side effects | Nausea, diarrhea, constipation, vomiting | Nausea, diarrhea, constipation, vomiting |
| Extra research to know about | Lowered heart attack and stroke risk in adults with heart disease and excess weight (SELECT trial) | Approved to treat moderate-to-severe obstructive sleep apnea in adults with obesity |
Trial averages aren’t predictions. Your results depend on your starting point, your dose, how well you tolerate the medication, and the habits you build alongside it.
Which One Causes More Weight Loss?
For years, doctors compared these medications using separate studies. In 2025, we finally got a direct comparison.
In the SURMOUNT-5 trial, adults with obesity (but without type 2 diabetes) were randomly assigned to tirzepatide or semaglutide for 72 weeks. The tirzepatide group lost an average of 20.2% of their body weight, compared with 13.7% for semaglutide. Tirzepatide also led to a larger reduction in waist size (Aronne et al., NEJM, 2025).
That’s a real difference. But “more average weight loss” doesn’t automatically mean “better for you.” Plenty of people reach their goals on semaglutide. And some people who try tirzepatide find that a different medication suits their body or budget better. Averages describe groups, not individuals.
What Side Effects Should You Expect?
Because both medications slow digestion and act on appetite signals, their side effects look very similar. The most common are:
- Nausea, especially in the first weeks and after each dose increase
- Diarrhea or constipation
- Vomiting or feeling overly full
- Reduced appetite (which is partly the point, but it can make it harder to get enough protein and fluids)
- Fatigue or mild headaches early on
For most people, these effects are mild to moderate and ease as the body adjusts. That’s why both medications start at a low dose and increase slowly.
There are also less common but serious risks that your provider will screen for, including pancreatitis, gallbladder problems, and a boxed warning about thyroid C-cell tumors seen in animal studies. People with a personal or family history of medullary thyroid cancer or MEN 2 shouldn’t use either medication. Neither is recommended during pregnancy.
This is one reason supervision matters. A good weight loss program doesn’t just hand you a prescription. It checks your labs, adjusts your dose, helps you manage side effects, and makes sure you’re eating enough protein to protect your muscle.
Is One Safer for Your Heart?
Semaglutide has the larger body of cardiovascular research so far. In the SELECT trial, adults with established heart disease and overweight or obesity (but not diabetes) who took semaglutide had a 20% lower risk of heart attack, stroke or cardiovascular death than those on placebo (Lincoff et al., NEJM, 2023).
Tirzepatide’s cardiovascular outcome research is still developing, although it has shown improvements in blood pressure, cholesterol and blood sugar in trials. If heart health is a major concern for you, it’s a worthwhile question to raise with your provider.
What Happens When You Stop Taking Them?
This is the question fewer people ask up front, and one of the most important.
Obesity is a chronic condition, and these medications work while you’re taking them. In the STEP 1 extension study, people who stopped semaglutide regained about two-thirds of the weight they had lost within a year (Wilding et al., Diabetes Obes Metab, 2022). In SURMOUNT-4, people switched from tirzepatide to placebo regained about 14% of their body weight, while those who stayed on tirzepatide kept losing (Aronne et al., JAMA, 2024).
That doesn’t mean you’re stuck on a medication forever. It means your plan should include:
- Building strength and protecting muscle while you lose weight
- Nutrition habits you can keep when your appetite returns
- Addressing other things that drive weight gain, like hormone shifts, thyroid function, sleep, and stress
- A thoughtful, provider-guided plan for maintenance or tapering
That whole-person approach is how we run our medical weight loss program in Kalispell.
How Do You Choose Between Semaglutide and Tirzepatide?
There’s no universal winner. Here are the factors your provider will typically weigh with you:
Your weight loss goal. If you have a significant amount of weight to lose, tirzepatide’s larger average effect may be appealing. If your goal is more moderate, semaglutide may be all you need.
Your health history. Heart disease, diabetes, sleep apnea, gallbladder issues, thyroid history, and other medications all factor in.
How you tolerate it. Some people do better on one than the other. Your first few months tell you a lot, and switching is an option if side effects are hard to manage.
Hormones and metabolism. For many women in their 40s and 50s, weight gain is tied to perimenopause and menopause. A GLP-1 can help with appetite, but if hormone changes are part of the picture, addressing them may make a real difference in energy, sleep and body composition. Learn about our bioidentical hormone therapy.
Cost and access. Prices vary a lot depending on the medication, dose, insurance coverage, and whether the program includes labs and follow-up visits. Based on medication cost alone, tirzepatide costs more than semaglutide.
Brand-Name or Compounded: What Does All About You Offer?
We want to be upfront about this. At All About You, we offer compounded semaglutide and compounded tirzepatide, not the brand-name products.
Here’s what that means for you:
- Compounded medications are prepared by a compounding pharmacy rather than made by the brand manufacturer.
- Compounded medications are not FDA-approved. According to the FDA, that means the FDA doesn’t review them for safety, effectiveness or quality before they’re dispensed.
- The research in this article was done on the brand-name medications. Trial results like STEP 1, SURMOUNT-1 and SURMOUNT-5 describe those products, not compounded versions specifically.
- Compounded options usually cost far less than brand-name medications without insurance coverage, which is a big reason many patients choose them.
Your provider will talk through what compounded medication means, how your dose is managed and whether a brand-name option through your insurance might make sense for you instead. Ask us anything. You deserve clear answers before you start.
How Much Do Semaglutide and Tirzepatide Cost in Kalispell?
At All About You, your first visit starts with initial labs ($295) and a 45-minute medical weight loss consultation ($195). Our compounded medication is sold by the vial, and everyone starts at the lowest dose:
- Compounded semaglutide: starts at $63 per month (range $63–$316). Most patients pay about $94–$158 per month.
- Compounded tirzepatide: starts at $90 per month (range $90–$540). Most patients pay about $135–$225 per month.
Maintenance labs are $195 once a year. For the full breakdown, including what you’ll spend upfront, see How Much Does Medical Weight Loss Cost in Kalispell?
When comparing programs anywhere, ask what’s included beyond the medication itself: lab work, follow-up visits, dose adjustments, nutrition guidance and support when side effects come up. A lower sticker price without supervision isn’t always the better value.
What Does Medical Weight Loss Look Like at All About You?
At All About You, we start by listening. Many of the women we see have been told to “just eat less and move more,” or that their labs look “normal,” while they still feel stuck.
Here’s what the process typically looks like:
- A consultation where we hear your story, your history, and what you’ve already tried
- Lab testing, including thyroid, hormone, blood sugar, insulin and cholesterol markers, to understand what’s driving your weight
- A personalized plan, which may include a GLP-1 medication if it’s appropriate for you, along with nutrition, hormone and lifestyle support
- Ongoing check-ins to adjust your dose, manage side effects, and keep you moving toward your goals
No shame, no judgment and no quick-fix promises. Just a plan built around you.
Frequently Asked Questions
Is tirzepatide stronger than semaglutide?
In the head-to-head SURMOUNT-5 trial, tirzepatide produced more average weight loss (20.2% vs. 13.7% at 72 weeks). “Stronger” on average doesn’t mean it’s the better fit for every person, though.
Can I switch from semaglutide to tirzepatide?
Many people do switch, usually because of side effects, a plateau, or cost. Switching should be done with your provider so your starting dose is set safely.
How quickly will I see results?
Most people notice changes in appetite within the first few weeks. Weight loss is gradual, because doses increase slowly over the first several months.
Do I have to diet while taking a GLP-1?
You don’t need an extreme diet, but nutrition matters. Prioritizing protein, fiber, and fluids helps manage side effects and protects muscle while you lose weight.
Are these medications only for people with diabetes?
No. Both have FDA-approved versions for chronic weight management in adults with obesity, or with overweight plus a weight-related health condition. Your provider will help decide if you qualify.
Will I gain the weight back?
Research shows many people regain weight after stopping. That’s why a good program builds habits, supports muscle and hormone health, and plans for maintenance from the start.
Ready to Find Out Which Option Fits You?
You don’t need more willpower. You need the right plan and a team that listens. If you’re in Kalispell, Whitefish, Columbia Falls or anywhere in the Flathead Valley and wondering whether semaglutide or tirzepatide could help, we’d love to talk.
Book your consultation with All About You Wellness & Aesthetics
This article is for educational purposes only and isn’t a substitute for personalized medical advice. Talk with a qualified provider about whether any medication is right for you.