Semaglutide vs tirzepatide: which wins for weight loss?
Ozempic, Wegovy, Mounjaro, Zepbound — the brand names are confusing. Here's a plain-English breakdown of what each drug is, how they compare on results, cost, and side effects, and how to choose.
What each drug actually is
Semaglutide is a GLP-1 receptor agonist. GLP-1 is a hormone your gut releases after eating — it signals your brain that you're full, slows digestion, and reduces appetite. Semaglutide mimics that signal in a weekly injectable form, keeping appetite suppressed around the clock.
Tirzepatide does the same thing, but adds a second hormone: GIP (glucose-dependent insulinotropic polypeptide). GIP plays a role in fat storage and insulin sensitivity. By targeting both receptors, tirzepatide produces a stronger metabolic effect — which is why the clinical trials show slightly higher weight loss numbers.
Both are injectable medications taken once weekly. Both require a prescription. Neither is a substitute for lifestyle changes — they work best when paired with dietary adjustments.
Brand names decoded
Semaglutide
Ozempic — semaglutide at diabetes dosing (up to 1 mg weekly), FDA-approved for type 2 diabetes. Widely prescribed off-label for weight loss.
Wegovy — semaglutide at the weight-loss dose (up to 2.4 mg weekly), FDA-approved specifically for chronic weight management in adults with BMI ≥30 or ≥27 with a weight-related condition.
Compounded semaglutide — the same active molecule made by a licensed compounding pharmacy. Legal when brand-name Wegovy is on the FDA shortage list. Typically $300–$500/month versus $900–$1,200 for brand-name Wegovy.
Tirzepatide
Mounjaro — tirzepatide at diabetes dosing (up to 15 mg weekly), FDA-approved for type 2 diabetes. Also widely prescribed off-label for weight loss.
Zepbound — tirzepatide at the weight-loss dose (same molecule, same dosing, different brand), FDA-approved specifically for chronic weight management.
Compounded tirzepatide — available through licensed compounding pharmacies while the shortage designation applies. Typically $400–$600/month.
Side-by-side comparison
| Semaglutide | Tirzepatide | |
|---|---|---|
| Mechanism | GLP-1 agonist | GIP + GLP-1 dual agonist |
| Brand names | Ozempic, Wegovy | Mounjaro, Zepbound |
| FDA weight-loss approval | Wegovy (2021) | Zepbound (2023) |
| Average weight loss | ~15–17% body weight | ~21–22% body weight Higher |
| Compounded cost | $300–$500/month Lower | $400–$600/month |
| Brand-name cost | $900–$1,200/month | $1,000–$1,400/month |
| Nausea | Common during dose escalation | Slightly less common Better |
| Availability | Wide — longer on market Better | Growing, fewer providers |
| Injection frequency | Once weekly | Once weekly |
| Real-world track record | 5+ years Longer | ~2–3 years |
Which produces more weight loss?
Based on clinical trial data, tirzepatide edges ahead. The SURMOUNT-1 trial showed an average weight loss of 21–22% at the highest dose over 72 weeks. The STEP-1 trial for semaglutide showed an average of 15–17% at the highest dose over 68 weeks.
The gap is real but shouldn't be overread. Both trials used different patient populations, timelines, and dosing protocols. In practice, both drugs produce substantial weight loss in the majority of patients — far more than diet and exercise alone.
Bottom line
If your goal is maximum weight loss and you're starting fresh, tirzepatide has the edge in clinical trials. If you want a longer track record and wider provider availability — or you've already started semaglutide with good results — there's no compelling reason to switch.
Cost: compounded vs brand-name
This is where most people get surprised. Brand-name Wegovy and Zepbound are both priced around $1,000–$1,400 per month without insurance — and most commercial insurance plans either don't cover GLP-1s for weight loss or require extensive pre-authorization.
The more common path at med spas and weight loss clinics is compounded semaglutide or tirzepatide through a licensed compounding pharmacy. These programs bundle the medication, supplies (needles, alcohol swabs), and regular check-ins into a monthly subscription, typically:
Compounded semaglutide: $300–$500/month
Compounded tirzepatide: $400–$600/month
Costs vary by city, provider, and dose. NYC and LA programs tend to run 10–20% above national averages. The best way to compare is to look at what providers actually charge — which is exactly what Get Clear Beauty shows upfront.
Bottom line
Semaglutide is typically $100–$150/month cheaper than tirzepatide in compounded form. Over a full 12-month program, that's a meaningful difference — but both are far more accessible than brand-name options.
Side effects
The most common side effects for both medications are nausea, constipation, fatigue, and decreased appetite, usually strongest during the dose escalation phase (the first 3–4 months). Most patients find these manageable and improve significantly once they stabilize at their target dose.
Some head-to-head studies suggest tirzepatide causes slightly less nausea than semaglutide, possibly because the GIP receptor activity moderates gastrointestinal effects — but the difference is modest.
Serious side effects are rare for both: pancreatitis, gallbladder disease, and (a theoretical concern from rodent studies, not confirmed in humans) thyroid C-cell changes. Both drugs carry a black box warning for patients with a personal or family history of MEN2 or medullary thyroid carcinoma.
Always disclose your full medical history to your prescribing provider before starting either medication.
Who should choose which?
Choose semaglutide if:
You want the longest track record and widest provider network. Semaglutide has been on the market longer, which means more prescribers are comfortable with it and there's more real-world data across diverse patient populations. It's also typically $100–$150/month cheaper in compounded form. Good starting point if you're new to GLP-1 medications.
Choose tirzepatide if:
You want to maximize weight loss results and have the budget for it. Clinical trials show a higher average percentage of body weight lost. It's also worth considering if you've tried semaglutide and plateaued — tirzepatide's dual mechanism can produce results in patients who didn't respond strongly to GLP-1-only therapy. Note that fewer providers currently offer it, so availability may vary by location.
Already on one and wondering about switching?
If semaglutide is working well for you, there's generally no need to switch. If you've been on semaglutide for 3+ months, hit your maintenance dose, and feel like you've plateaued, talk to your provider about whether tirzepatide makes sense for your situation.
The honest answer
Both drugs work. Tirzepatide wins on average weight loss in clinical trials. Semaglutide wins on cost, availability, and track record. The best choice depends on your budget, goals, and which providers in your area offer the program you need — which is exactly why transparent pricing matters.
See what providers in your city actually charge
Compare semaglutide and medical weight loss programs with pricing posted upfront — no calls required.
Search providers near meHow to find a provider with transparent pricing
GLP-1 programs are offered by med spas, concierge clinics, telehealth practices, and weight loss centers. Pricing varies significantly — and most providers don't publish it, which means you'd normally have to call around or sit through a consultation just to find out what the program costs.
Get Clear Beauty lists verified semaglutide and medical weight loss providers with real pricing shown upfront. Search by ZIP code to see what programs cost in your area before booking anything.
When comparing providers, ask:
- →Is the compounding pharmacy 503A or 503B licensed?
- →What's included in the monthly fee — medication, supplies, check-ins?
- →How does the dose escalation schedule work?
- →Is there a minimum commitment, and what's the cancellation policy?
Browse semaglutide providers or medical weight loss programs on Get Clear Beauty to compare your options.
FAQ
Is tirzepatide better than semaglutide for weight loss?
Clinical trials show tirzepatide produces slightly greater average weight loss — around 21–22% of body weight versus 15–17% for semaglutide. However, both drugs are highly effective, and individual results vary. Tirzepatide is a newer dual-hormone drug (GIP + GLP-1), while semaglutide has a longer real-world track record.
What is the difference between Ozempic and Mounjaro?
Ozempic contains semaglutide, a GLP-1 receptor agonist FDA-approved for type 2 diabetes. Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist also FDA-approved for type 2 diabetes. Both are commonly prescribed off-label for weight management, or through their branded weight-loss versions (Wegovy and Zepbound).
What is the difference between Wegovy and Zepbound?
Wegovy is semaglutide at the weight-loss dose (up to 2.4 mg weekly), FDA-approved for chronic weight management. Zepbound is tirzepatide at the weight-loss dose (up to 15 mg weekly), also FDA-approved for chronic weight management. Zepbound trials show slightly higher average weight loss, but both require a prescription and work best alongside lifestyle changes.
Which GLP-1 medication is cheaper?
Compounded semaglutide typically costs $300–$500 per month through a licensed med spa or clinic. Compounded tirzepatide runs slightly higher at $400–$600 per month. Brand-name Wegovy and Zepbound are both priced around $900–$1,400 per month without insurance.
Can I switch from semaglutide to tirzepatide?
Yes. Many patients transition from semaglutide to tirzepatide if they plateau or want to maximize results. Your provider will typically stop semaglutide and start tirzepatide at a low dose, escalating gradually. Always discuss the switch with your prescribing provider before making changes.
What are the side effects of semaglutide vs tirzepatide?
Both medications share similar side effect profiles: nausea, constipation, fatigue, and reduced appetite are most common, especially during dose escalations. Some studies suggest tirzepatide may cause slightly less nausea than semaglutide, though both are generally well tolerated. Serious side effects — pancreatitis, gallbladder issues — are rare with either drug.
Is compounded semaglutide or tirzepatide safe?
Compounded versions can be safe when sourced from a state-licensed 503A or 503B compounding pharmacy. Ask your provider which pharmacy they use and verify the pharmacy's license. Avoid programs that don't disclose their pharmacy source or that ship from vague "international" suppliers.
Where can I find semaglutide or tirzepatide near me with transparent pricing?
Get Clear Beauty lists verified semaglutide and medical weight loss providers across major US cities with real pricing shown upfront. Search by ZIP code at getclearbeauty.com to compare programs in your area — no calls or consultations required to see pricing.