If you're considering a compounded GLP-1 medication for weight loss, you have two primary options: semaglutide and tirzepatide. Both have demonstrated remarkable effectiveness in clinical trials, both are available through licensed telehealth providers, and both cost significantly less in compounded form than their brand-name counterparts.
But they're not identical. They work through different mechanisms, have different clinical profiles, and come at different price points. This guide breaks down the comparison so you can have an informed conversation with your healthcare provider about which one makes the most sense for your situation.
Head-to-Head Comparison
| Feature | Compounded Semaglutide | Compounded Tirzepatide |
|---|---|---|
| Drug Class | GLP-1 receptor agonist | Dual GIP/GLP-1 receptor agonist |
| Brand-Name Versions | Ozempic, Wegovy (Novo Nordisk) | Mounjaro, Zepbound (Eli Lilly) |
| Avg. Weight Loss (Trials) | ~15% body weight (STEP trials) | ~21% body weight (SURMOUNT trials) |
| Compounded Cost | $149–$299/month | $249–$450/month |
| Injection Frequency | Once weekly | Once weekly |
| Common Side Effects | Nausea, diarrhea, constipation | Nausea, diarrhea, constipation |
| FDA Shortage Status | Resolved Feb 2025 | Resolved Oct 2024 |
| Availability (Compounded) | Widely available via 503A | Available via 503A pharmacies |
How They Work: Single vs. Dual Agonist
The fundamental difference between semaglutide and tirzepatide is their mechanism of action.
Semaglutide is a GLP-1 receptor agonist. It mimics the hormone GLP-1, which your body naturally produces after eating. GLP-1 tells your brain you're full, slows stomach emptying, and helps regulate blood sugar. Semaglutide does the same thing but much more powerfully and for much longer than your natural hormones.
Tirzepatide is a dual GIP/GLP-1 receptor agonist — sometimes called a "twincretin." It activates both the GLP-1 receptor and the GIP (glucose-dependent insulinotropic polypeptide) receptor. The GIP component adds additional metabolic benefits, including effects on fat metabolism and insulin sensitivity that GLP-1 alone doesn't provide.
This dual mechanism is widely believed to be the reason tirzepatide has shown higher average weight loss in clinical trials compared to semaglutide, though direct head-to-head trials in a weight loss setting are limited.
Effectiveness: What the Numbers Say
Clinical trial results favor tirzepatide for overall weight loss, but context matters.
In the STEP trials, semaglutide at 2.4mg (the maximum FDA-approved dose for weight management) produced average weight loss of about 15% of body weight over 68 weeks. That translates to roughly 35 pounds for someone starting at 230 pounds.
In the SURMOUNT trials, tirzepatide at the maximum dose (15mg) produced average weight loss of about 21% of body weight over 72 weeks — approximately 48 pounds for someone starting at 230 pounds.
Important caveat: these trials used different study designs, patient populations, and timeframes. They weren't head-to-head comparisons. Individual results vary widely regardless of which medication you choose. Your diet, exercise habits, sleep quality, stress levels, and overall metabolic health all influence outcomes.
💡 The Real-World Perspective
Clinical trial participants receive close medical monitoring, dietary guidance, and regular follow-up. Real-world results often differ. Some patients exceed trial averages; many fall below them. The best medication is the one you can afford, tolerate, and stay consistent with.
Cost Comparison: Compounded Versions
Compounded semaglutide is generally less expensive than compounded tirzepatide. The price difference reflects the higher raw material cost of tirzepatide API (active pharmaceutical ingredient) — it's a more complex molecule to synthesize.
Typical pricing ranges in 2026:
Compounded semaglutide: $149–$299/month through most telehealth providers, with some budget-friendly options at the lower end and premium full-service programs at the higher end.
Compounded tirzepatide: $249–$450/month, with higher doses typically costing more than starting doses. Providers offering flat pricing across all dose levels should be evaluated carefully — higher tirzepatide doses cost more to compound.
If budget is a primary concern, compounded semaglutide offers the best value. If maximizing weight loss is the priority and the price difference is manageable, tirzepatide's clinical edge may be worth the premium.
Side Effect Profiles
Both medications share similar side effect profiles — which makes sense, since they both work through GLP-1 receptor activation. The most commonly reported side effects are gastrointestinal: nausea, diarrhea, constipation, decreased appetite, and occasional vomiting.
Some data suggests that tirzepatide may cause slightly higher rates of diarrhea compared to semaglutide, while semaglutide may be associated with slightly higher rates of nausea. However, these differences are modest, and individual experiences vary enormously.
For both medications, side effects are most common during the initial weeks at each new dose level and tend to improve as your body adjusts. Proper titration — starting low and increasing gradually — is the most effective strategy for minimizing GI discomfort.
Which Compounded GLP-1 Should You Choose?
There's no universally "best" option — the right choice depends on your individual circumstances. Here's a decision framework:
Consider compounded semaglutide if: you're budget-conscious and want the most affordable GLP-1 option, you've been prescribed semaglutide before and responded well, you have type 2 diabetes (semaglutide has extensive diabetes trial data), or you want the medication with the longest track record in clinical use.
Consider compounded tirzepatide if: maximum weight loss is your priority, you've tried semaglutide and want something more potent, you have significant insulin resistance (the dual GIP/GLP-1 mechanism may offer additional metabolic benefits), or you can comfortably afford the higher monthly cost.
Talk to your provider about switching if: you've been on one medication for 3+ months without satisfactory results, side effects on one medication are intolerable even after proper titration, or your medical situation has changed.
Finding the Best Compounded GLP-1 Provider
Regardless of which medication you choose, the quality of your provider and their compounding pharmacy partner matters more than which molecule you select. A perfectly dosed semaglutide from a PCAB-accredited pharmacy will outperform a poorly compounded tirzepatide from an unverified source every time.
Our provider comparison page shows which telehealth platforms offer each medication, along with pricing, pharmacy certifications, and what's included in each program.