Study guide / Two related drugs
What can tesamorelin vs sermorelin studies tell you?
No trial here tested the drugs against each other. Studies can compare their parts, staying time, and tesamorelin's own results.
What is the main difference between the drugs?
No trial here tested the drugs against each other. The studies can't say one works better.
Each drug copies one brain hormone that starts growth hormone release. Amino acids are the small parts joined to make each drug.
Tesamorelin uses the full 44-amino-acid hormone. Sermorelin uses a shorter 29-amino-acid piece.
Tesamorelin has strong studies for fat changes during HIV care. Those results don't become proof about sermorelin.
This page sets their parts and staying time side by side. It can't name a winner for your care.
Why are the full and short forms different?
Tesamorelin copies the full 44-amino-acid brain hormone. One added piece at the front protects the drug [4].
Sermorelin keeps the first 29 amino acids of that hormone. That shorter piece can still start growth hormone release.
An enzyme normally cuts this hormone within minutes. Such proteins carry out work throughout the body.
Tesamorelin's added piece blocks that quick cut [4]. The growth gland therefore has more time to receive the drug.
The exact formula doesn't help with a care choice. What matters here is full length with protection versus a shorter piece.
Which drug has usable study results here?
Both can start hormone release from the growth gland and raise IGF-1 [4]. Only tesamorelin has usable results in the studies listed here.
Tesamorelin gained FDA approval in 2010 for the fat illness tied to HIV [5]. Ordinary weight loss is outside that approval.
At 26 weeks, deep belly fat fell 15.2% with tesamorelin. It rose 5.0% with placebo [1].
The loss stayed 18% below the start through 52 weeks [2]. IGF-1, the liver-made growth protein, rose [1].
Liver fat fell 37% more in one HIV study [6]. A 2026 review reached the same belly-fat result [12].
Its half-life was 26-38 minutes, showing how fast it left blood. The later IGF-1 effect lasted longer [15].
Those results belong only to tesamorelin studies. The tesamorelin vs sermorelin record gives no matching sermorelin results.
How many kinds of tesamorelin studies are listed?
Tesamorelin's results came from studies in people. Two Phase 3 trials were big final tests used when approval was judged [1][2].
One study measured belly and liver fat [3]. Another focused on fatty liver during HIV care [6].
A separate trial checked blood sugar. A 2024 trial studied people taking newer HIV drugs [10].
A 2026 review covered five trials [12]. Together, these studies support tesamorelin's one approved use.
Belly fat fell 15.2% in a main trial [1]. IGF-1, the liver-made growth protein, rose 81.0% [1].
Liver fat fell 37% more in another trial [6]. Each result belongs only to tesamorelin.
Tesamorelin's full length differs from sermorelin's shorter form [4]. That difference doesn't prove one works better.
What does tesamorelin's added front piece change?
A body enzyme cuts the brain hormone within minutes. Tesamorelin has an added piece where that enzyme would cut [4].
The added piece slows the first cut. The shorter sermorelin form lacks the same shield.
That design gives tesamorelin more time to act. It doesn't keep the drug in blood all day.
One study's math put clearance at about 1,060 liters an hour [15]. That is a removal-rate estimate, not blood leaving the body.
The 26-38 minutes describe its half-life. The later IGF-1 rise helps explain the daily test schedule [15].
No human trial here compared their results directly. This build difference can't name a winner for your care.
What can't this tesamorelin and sermorelin comparison claim?
A difference in build isn't a care verdict. These studies cover tesamorelin's body steps and HIV approval [1][2].
They also cover its belly-fat and liver-fat results [5][6]. They don't test tesamorelin against sermorelin in people.
This page can't call either drug safer or stronger. It also can't predict which your body would handle better.
The sound fact is narrower. Tesamorelin is full length and has an added shield [4][5].
Sermorelin is a shorter piece of the same brain hormone. Tesamorelin has FDA approval for one fat illness tied to HIV.
Every other tesamorelin use lacks FDA approval [5]. A comparison with another drug can't widen that approval.