Tirzepatide copies 2 gut hormones, while semaglutide copies 1. The weight study called SURMOUNT-5 found a larger drop with tirzepatide.
Read the blood-sugar study SURPASS-2, the weight study SURMOUNT-1, and the direct comparison SURMOUNT-5 in plain words.
What Tirzepatide changed in people
Used once each week, tirzepatide is a prescription shot for type 2 diabetes and weight loss. This page covers the main study findings and the chief side effects. The FDA approved it for this form of diabetes in May 2022, then approved obesity and overweight in November 2023.
The shot copies both hormones your gut makes. Medicines such as semaglutide copy 1. That is 2 hormone actions rather than 1. Tirzepatide often brought larger drops in blood sugar and body weight.
One study followed 1,879 people with type 2 diabetes for 40 weeks. Their blood-sugar test fell more with tirzepatide than with semaglutide [3]. Another weight study was called SURMOUNT-5. At 72 weeks, average weight fell about 20% with tirzepatide and 14% with semaglutide [5].
Nausea, vomiting, and diarrhea were the most common side effects. They were most likely while a dose rose; the Tirzepatide effects page sets the benefits beside the risks.
This site isn't a pharmacy, clinic, or seller. It explains published studies so you can discuss the group findings with your prescriber.
What the largest Tirzepatide studies found
Made as a short chain, tirzepatide is made from the small parts that form proteins [1]. An added fatty part keeps the medicine in your blood near five days, allowing a weekly shot [13]. The drug copies two gut hormones.
Tests on cells in a dish found that 1 hormone action was stronger [2]. A later review said that 1 action might help explain the added weight loss [10]. That is an idea, not proof from people.
A 40-week study called SURPASS-2, included 1,879 adults with type 2 diabetes. Each person knew which weekly shot was given. Researchers compared semaglutide 1 mg with tirzepatide at 5, 10, and 15 mg [3]. Semaglutide is a similar shot that copies 1 gut hormone.
The blood test for average sugar fell by 2.01, 2.24, and 2.30 points with tirzepatide. It fell by 1.86 points with semaglutide. A larger fall means better sugar control, and the study asked 1 main question: did tirzepatide work at least as well? All three doses cleared that mark and then brought larger drops. Weight fell by an extra −1.9, −3.6, and −5.5 kg [3].
The 72-week study called SURMOUNT-1 included 2,539 adults with obesity and no diabetes [4]. Neither the people nor the staff knew who got tirzepatide. The other 1 group got a placebo, which contains no tirzepatide. At 5, 10, and 15 mg, average weight fell −15.0%, −19.5%, and −20.9%. The placebo group lost −3.1%. More than 89% on 15 mg lost at least 5%. More than 56% lost at least 20%.
The direct tirzepatide vs semaglutide study, called SURMOUNT-5, followed 751 adults for 72 weeks. They had obesity but not type 2 diabetes. Each person took the largest dose they could bear. Average loss was −20.2% with tirzepatide and −13.7% with semaglutide. Tirzepatide's lead was about 6.5 percentage points of body weight. The paper's math strongly supported a real difference [5].
A separate study reviewed old medical records for 13,846 people with obesity. The team made the two groups as alike as it could. New type 2 diabetes was 27% less common with tirzepatide. The paper's 95% range is its best span for the true result, and the whole range favored tirzepatide, though old records can't prove cause. Average loss was −7.7 kg instead of −4.8 kg.
Among 8,446 people who had type 2 diabetes, serious heart trouble was 46% less common [8]. The 95% range also supported a real drop. Still, a review of records can suggest a link but can't prove the medicine caused it.
How Tirzepatide changes hunger and blood sugar
After you eat, your gut makes two hormones that help manage blood sugar. Tirzepatide copies both in one drug and stays active for days. Older drugs of this kind copy 1. The drug is a chain made from the same small parts as proteins.
What happens after the shot? When blood sugar rises, the drug helps your body release insulin. It also lowers another hormone that can push sugar higher. Food leaves your stomach more slowly, so you may feel less hungry [1][2].
One review looked at the second gut hormone. Copying it may ease nausea and curb hunger. It may also help insulin work and keep fat from gathering around organs [10]. The review suggests why copying two hormones may work better than copying one. It doesn't prove the reason.
Approval for type 2 diabetes came from the FDA in May 2022. Weight care followed in November 2023. Later approval covered moderate to severe sleep apnea, when breathing keeps stopping during sleep, tied to obesity.
In 1 large phase 3 study, the final broad test before approval, heart failure worsened less often and related deaths fell [15]. They also walked farther, while another study found less swelling and scarring from advanced fatty liver disease [16]. Your health decides which finding may matter.
Tirzepatide results for sugar and weight
These are the main tirzepatide results. The blood-sugar test shows your average over several months; placebo means a shot with no tirzepatide.
- Blood sugar in SURPASS-2, type 2 diabetes, 40 weeks: falls of −2.01 / −2.24 / −2.30 points at 5/10/15 mg, compared with −1.86 [3]
- SURPASS-2, type 2 diabetes, 40 weeks: body weight fell −7.8 / −10.3 / −12.4 kg at 5/10/15 mg, compared with −6.2 kg [3]
- SURMOUNT-1, obesity without diabetes, 72 weeks: body weight fell −15.0% / −19.5% / −20.9% at 5/10/15 mg, compared with −3.1% on placebo [4]
- Body weight in the direct study SURMOUNT-5 at 72 weeks: −20.2% with tirzepatide and −13.7% with semaglutide [5]
- Blood sugar across 16 studies: tirzepatide was ahead by −0.45 points. The paper's 95% range supported a real edge, though the studies differed [9]
- Time for your body to clear half: about 5 days, which fits weekly use [13]
The Tirzepatide research page walks through SURMOUNT-1 and SURMOUNT-5. The tirzepatide weight loss page stays with the weight findings.
What Pharmacy Tirzepatide can do for you
Pharmacy Tirzepatide explains published studies about tirzepatide. Despite the name, it isn't a pharmacy. Nothing is sold here, and no one writes prescriptions. The Tirzepatide references page lists each paper.
We place a paper number beside every study figure. That lets you check where a number came from. The medicine is called tirzepatide throughout the site.