Semaglutide vs Tirzepatide
How semaglutide and tirzepatide compare on results, dosing and side effects, and how our prescriber decides which one suits you.
One acts on a single gut hormone, the other on two
Semaglutide works on GLP-1, a hormone your gut releases when you eat that tells your brain you have had enough. Tirzepatide works on GLP-1 and on a second hormone called GIP at the same time. That extra target is the whole difference, and it is why the two produce different average results.
In the only large trial to test them directly, published in the New England Journal of Medicine, 751 adults took one or the other for 72 weeks. Tirzepatide produced an average loss of 20.2 percent of body weight against 13.7 percent for semaglutide, roughly 22.8 kilograms against 15.0. Around 31 percent of the tirzepatide group lost at least a quarter of their starting weight, against 16 percent on semaglutide. Results vary considerably between individuals.
Two things that trial does not settle. It compared the branded products at their maximum tolerated doses, so it describes the molecules rather than any particular pharmacy's preparation. And a better average is not a better answer for one person: tolerance, history and cost all move the decision, which is why a prescriber makes it with you rather than a table making it for you.
What actually moves the choice
Both are prescribed here. The conversation usually turns on these, not on which one has the bigger headline number.
- What you have taken before, and how it went
- How much weight you and the provider are aiming at
- How well you tolerated a dose increase last time
- Any thyroid, pancreatic or digestive history
- What each option costs across your program
- Whether you have stalled on your current medication
The same program either way
Whichever molecule your provider prescribes, the program is the same shape: the consultation, your follow-ups, medication delivery and every dose adjustment are covered, with no contract.
-
FREE Medical Weight Loss Phone Consultation
15 min
A no-cost call to work out which of the two suits you.
-
Medical Weight Loss Injection (already have meds)
5 min
Already prescribed? A Registered Nurse can give your weekly shot here.
Each one in detail
-
Semaglutide
The single-hormone option, a lower dose ladder and the one most people have heard of. Read the semaglutide page.
-
Tirzepatide
The dual-hormone option, more dose steps and the stronger average result. Read the tirzepatide page.
-
The whole program
Pricing, how the visits work and what is included, on the medical weight loss page.
Choosing between them
Neither, at first. Bring your history and your goal to the consultation and let the prescriber recommend one. People who arrive certain about a molecule are often reacting to something they read rather than to how their own body handled a medication, and that is the information that actually decides it.
No. It produced more weight loss on average in the head-to-head trial, and averages hide a lot. Some people do well on semaglutide, tolerate it easily and reach their goal on it. Cost differs too. The right answer is the one you can stay on comfortably for as long as you need it.
Broadly the same family: nausea, feeling full quickly, constipation or loose stools, mostly early or after a dose rise. In the trials digestive effects grew more common at higher doses of either drug, and a small proportion of people stopped because of them. How gradually you climb matters more than which molecule you are on.
Yes, and people do, usually after a plateau or a rough run of side effects. Switching means starting low again on the new dose ladder rather than transferring across at an equivalent dose. Raise it at a follow-up and the provider will say whether it is worth doing.
Yes. Both are prepared for you by an FDA-registered compounding pharmacy, which is not the same as a manufacturer's branded product, and every prescription is written individually by a licensed provider after reviewing your health history.
Let the prescriber decide with you
A free fifteen minute call is usually enough to know which of the two fits your history and your goal.