In SURMOUNT-1, Zepbound (brand tirzepatide) averaged about 2.5% body-weight loss by week 4, 8.5% by week 12 and about 22.5% by week 72 (Compounded versions were not in that trial, and the FDA does not review compounded drugs for potency, purity, or effectiveness — do not expect the same result.). The dose is raised in steps, so the effect builds over months; individual results vary widely.
The brand schedule it follows
- Week 1–4: 2.5 mg — Starting dose — body adjusts
- Week 5–8: 5 mg — First therapeutic dose
- Week 9+: 7.5–15 mg — Titrate by 2.5 mg every 4 weeks as tolerated
- Maintenance: Up to 15 mg — Maximum approved dose
Expected weight-loss curve
Mean body-weight change across 72 weeks on Zepbound (brand tirzepatide) from the SURMOUNT-1 trial. Curve smoothed from published endpoints; individual results vary significantly.
Trial participants also received lifestyle counseling. Real-world results depend on dose adherence, side-effect tolerance, and lifestyle factors.
When to reassess
The Compounded Tirzepatide label sets no time point for judging whether it is working. Ask your prescriber when they plan to review your response, and do not change the dose on your own.
Why GLP-1 medicines work gradually, and what the first weeks usually feel like, is covered once for the whole class in how long GLP-1 medications take to work.
Common questions
How long does Compounded Tirzepatide stay in the body?
Compounded Tirzepatide has a half-life of about five days and is taken once weekly.
When should I talk to my prescriber if Compounded Tirzepatide isn't working?
The Compounded Tirzepatide label sets no time point for judging response. Ask your prescriber when they plan to review it, and do not change the dose on your own.