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retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for mechanism questions, Phase 2 dose-ranging interpretation, and the specific analytical problems a 39-residue tri-agonist creates for purity testing.

14 questions · sorted by votes

32 votes5 answers16k views
Is a 97.5% purity result a problem or just a longer peptide?

I have the report as a PDF with the chromatogram on page two, so I can quote specifics. This is presented as though it settles something, and I am not convinced it…

purity
purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

788 questions
hplc
hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

466 questions
retatrutide
retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for…

14 questions
glucagon-receptor
glucagon-receptor

Glucagon receptor agonism as a deliberate component of dual and tri-agonists: what it adds in energy expenditure and hepatic fat mobilisation, and…

14 questions
asked by ekaterina_volk 16k · 20 months ago
30 votes 3 answers13k views
What does adding glucagon receptor agonism actually buy, and what does it cost you?

I am trying to understand the logic of putting glucagon receptor agonism into a weight-loss molecule, because on the face of it it sounds like a mistake. Glucagon…

retatrutide
retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for…

14 questions
survodutide
survodutide

A GLP-1 and glucagon receptor dual agonist with a substantial published MASH dataset. Use this tag for its hepatic endpoints, its dose ladder, and…

14 questions
glucagon-receptor
glucagon-receptor

Glucagon receptor agonism as a deliberate component of dual and tri-agonists: what it adds in energy expenditure and hepatic fat mobilisation, and…

14 questions
clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
asked by s_bhattacharya 42k · 20 months ago
28 votes 5 answers19k views
What is a realistic achievable purity for a 39-residue peptide?

I have the report as a PDF with the chromatogram on page two, so I can quote specifics. I can do the algebra. I am not confident about the conversion factors. If…

purity
purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

788 questions
retatrutide
retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for…

14 questions
hplc
hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

466 questions
asked by Dr_Aoife_Brennan 50k · 2.3 years ago
26 votes 3 answers24k views
Is the top of the ladder the most effective dose, or just the highest one that was studied?

The label maximum gets treated as a destination — the "full dose", as though anything below it is partial. But a label maximum is the highest dose a sponsor took…

dose-escalation
dose-escalation

The decision to move up a step: what evidence supports a four-week interval, what happens when you compress it, and how trial protocols handled…

88 questions
clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
tirzepatide
tirzepatide

A dual GIP and GLP-1 receptor agonist. Questions here cover the SURPASS and SURMOUNT programmes, the practical differences from a pure GLP-1…

162 questions
retatrutide
retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for…

14 questions
maintenance-dose
maintenance-dose

Staying put: the lowest dose that holds a result, the difference between the maximum studied dose and the maximum useful dose, and what the…

44 questions
asked by sample_id 17k · 6 months ago
19 votes3 answers5k views
How reliably does a Phase 2 dose-ranging result predict the Phase 3 number?

The obesity pipeline is currently full of phase 2 results being quoted as though they were established magnitudes. Retatrutide at -24.2% over 48 weeks is the…

clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
retatrutide
retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for…

14 questions
mazdutide
mazdutide

A GLP-1 and glucagon receptor dual agonist developed primarily in China, with a distinct dose range and a fast-moving publication record.…

14 questions
ecnoglutide
ecnoglutide

A long-acting GLP-1 receptor agonist with a cAMP-biased signalling profile. A niche tag, mostly used for mechanism questions about biased agonism…

14 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by ilaria_bertone 43k · 3 months ago
17 votes 5 answers14k views
What does STEP 1 actually establish about liraglutide?

The case in front of me: STEP 1 · liraglutide. The figures are clear enough; the question is what they mean and what they do not. I can supply the numbers if the…

clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
semaglutide
semaglutide

A GLP-1 receptor agonist with a fatty-acid-acylated backbone and a roughly one-week half-life, marketed for type 2 diabetes and for weight…

360 questions
cardiovascular
cardiovascular

Cardiovascular outcomes: the SELECT major-adverse-event result, SOUL, SUSTAIN 6 and REWIND, how to convert a hazard ratio into an absolute risk…

111 questions
retatrutide
retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for…

14 questions
asked by swirl_dont_shake 19k · 17 months ago
9 votes 5 answers27k views
CagriSema versus a tri-agonist — different mechanisms, same result?

I am asking mechanistically rather than practically — I want the model, not the protocol. The comparison I want does not seem to exist anywhere in a form I can…

cagrisema
cagrisema

A fixed-ratio combination of cagrilintide, a long-acting amylin analogue, with semaglutide, studied in the REDEFINE programme. Questions here…

14 questions
retatrutide
retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for…

14 questions
amylin
amylin

Amylin and its analogues, most prominently cagrilintide, as a satiety mechanism orthogonal to incretin signalling. Includes the pharmacology of…

14 questions
asked by bufferline42 49k · 20 months ago
8 votes0 answers4.8k views
Is SURMOUNT-4 a fair comparison of mazdutide against its comparator arm?

Setup, so nobody has to ask: SURMOUNT-4 · mazdutide. This has the shape of a fact but I cannot find its origin. What I found instead were three secondary sources all…

clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
semaglutide
semaglutide

A GLP-1 receptor agonist with a fatty-acid-acylated backbone and a roughly one-week half-life, marketed for type 2 diabetes and for weight…

360 questions
tirzepatide
tirzepatide

A dual GIP and GLP-1 receptor agonist. Questions here cover the SURPASS and SURMOUNT programmes, the practical differences from a pure GLP-1…

162 questions
retatrutide
retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for…

14 questions
asked by birk_nordahl 20k · 8 months ago
7 votes 5 answers11k views
Is GIP agonism or antagonism the metabolically useful direction?

The receptor pharmacology I can follow; the in vivo translation is where I lose the thread. I would like the axes of comparison first and the recommendation second. I…

gip-receptor
gip-receptor

GIP receptor pharmacology, and the still-unsettled question of whether agonism or antagonism at GIPR is the metabolically useful direction.…

83 questions
tirzepatide
tirzepatide

A dual GIP and GLP-1 receptor agonist. Questions here cover the SURPASS and SURMOUNT programmes, the practical differences from a pure GLP-1…

162 questions
glp1-mechanism
glp1-mechanism

Receptor-level pharmacology: GLP-1R as a class B GPCR, cAMP and PKA signalling, biased agonism, internalisation and resensitisation, and the…

175 questions
retatrutide
retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for…

14 questions
asked by marcus_thorbjorn 16k · 6 months ago
7 votes 5 answers3.2k views
Survodutide versus retatrutide on hepatic endpoints?

This matters because it predicts what a related molecule should do. I suspect the honest answer is that it depends, in which case I would like to know on what. Assume…

survodutide
survodutide

A GLP-1 and glucagon receptor dual agonist with a substantial published MASH dataset. Use this tag for its hepatic endpoints, its dose ladder, and…

14 questions
retatrutide
retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for…

14 questions
mash
mash

Metabolic dysfunction-associated steatohepatitis: histological endpoints, resolution without worsening fibrosis, fibrosis improvement by stage,…

51 questions
asked by swab_stopper 16k · 26 days ago
6 votes5 answers20k views
What does the glucagon arm of a tri-agonist add, and what does it cost?

I would like to know how much of this is established and how much is a reasonable story. I have used one of these for a while and I am considering switching, which…

glucagon-receptor
glucagon-receptor

Glucagon receptor agonism as a deliberate component of dual and tri-agonists: what it adds in energy expenditure and hepatic fat mobilisation, and…

14 questions
retatrutide
retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for…

14 questions
survodutide
survodutide

A GLP-1 and glucagon receptor dual agonist with a substantial published MASH dataset. Use this tag for its hepatic endpoints, its dose ladder, and…

14 questions
asked by h_villanueva 50k · 2.3 years ago
6 votes0 answers2.2k views
What does the mechanism of tirzepatide predict that ESSENCE did not test?

The particulars: tirzepatide · ESSENCE. I understand the observation; what I do not understand is the mechanism behind it. I have read the two review articles that…

glp1-mechanism
glp1-mechanism

Receptor-level pharmacology: GLP-1R as a class B GPCR, cAMP and PKA signalling, biased agonism, internalisation and resensitisation, and the…

175 questions
clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
gip-receptor
gip-receptor

GIP receptor pharmacology, and the still-unsettled question of whether agonism or antagonism at GIPR is the metabolically useful direction.…

83 questions
retatrutide
retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for…

14 questions
glucagon-receptor
glucagon-receptor

Glucagon receptor agonism as a deliberate component of dual and tri-agonists: what it adds in energy expenditure and hepatic fat mobilisation, and…

14 questions
asked by ravenna_pace 13k · 4 months ago
1 vote5 answers3.9k views
How predictive is a Phase 2 dose-response for a Phase 3 result?

The clinician who ordered the panel was not concerned; I would still like to understand it. This is one of those things that everyone repeats and nobody derives. This…

clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
retatrutide
retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for…

14 questions
dose-escalation
dose-escalation

The decision to move up a step: what evidence supports a four-week interval, what happens when you compress it, and how trial protocols handled…

88 questions
mazdutide
mazdutide

A GLP-1 and glucagon receptor dual agonist developed primarily in China, with a distinct dose range and a fast-moving publication record.…

14 questions
asked by rosa_mendieta 13k · 4 months ago
1 vote3 answers3.2k views
Does splitting a 20 mg weekly dose of mazdutide across two administrations change anything?

What I am working with: 20 mg · mazdutide. The empirical answer seems settled. The explanation does not. If the honest answer is that nobody knows, I would rather…

split-dosing
split-dosing

Dividing a weekly dose across more than one administration. Questions here concern the pharmacokinetic rationale, whether the peak-to-trough ratio…

39 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
glp1-mechanism
glp1-mechanism

Receptor-level pharmacology: GLP-1R as a class B GPCR, cAMP and PKA signalling, biased agonism, internalisation and resensitisation, and the…

175 questions
retatrutide
retatrutide

An investigational GLP-1, GIP and glucagon receptor tri-agonist, studied in the TRIUMPH programme. Not approved anywhere. Use this tag for…

14 questions
asked by pk_curve 12k · 7 months ago
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