Numbers first: 24 mg · orforglipron.
This is a planning question. I know what my options are; I do not know how to weigh them.
What I want is the minimum viable version, which I suspect is smaller than what I would design.
What is the minimum version of this that is still defensible?
24 mg a week is 3.429 mg a day averaged out and 1248 mg over a year — but "defensible" is not a property of the number, it is a property of where the number came from. A maintenance dose is defensible when a trial randomised people to it and reported what happened, and indefensible when it was arrived at by interpolation between two doses that were studied. So the question to ask of 24 mg is which arm it corresponds to: if a programme ran 24 mg as a maintenance level, there is an efficacy figure, a tolerability figure and a discontinuation rate attached to it. If it sits between two studied levels, everything said about it is extrapolation, and the burden of that is on whoever proposed it. The other half of the arithmetic is supply: at 24 mg a week a 10 mg vial is 0.42 weeks and you will need about 125 of them a year, which is worth knowing before the dose is settled rather than after. Maintenance doses are set by a prescriber against an individual; nothing here is medical advice.
The relevant observation is that maintenance frequently requires less exposure than the loss phase did, and the trials suggest it rather than establish it.
Maintenance and loss are different endpoints. Loss requires a sustained energy deficit; maintenance requires only that the counter-regulatory drive is offset, and that may need less exposure.
Weight is a noisy signal. A rolling four-week average is the instrument; single weigh-ins after a dose reduction will show nothing interpretable.
STEP-4 and SURMOUNT-4 evaluated withdrawal rather than dose reduction, which is the limit of the direct evidence on this question.
The caveat is that dose reduction is a clinical decision and this is a description of a search strategy rather than a recommendation.
Search downward, one step, eight weeks each, on a rolling average.
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Browse resultsThe relevant detail is that this is a question the trial programmes answered only partially, and it is worth saying which parts are evidenced.
A downward search proceeds one step at a time with at least eight weeks at each level, because a weekly agent takes four to five weeks to reach the new steady state and then needs time for the trend to be readable.
Concretely, the withdrawal trials — STEP-4 and SURMOUNT-4 — established what happens when treatment stops entirely. They did not evaluate dose reduction, so the evidence for a lower maintenance dose is inference rather than data.
A noisy weight signal makes premature conclusions easy, in both directions.
Glycaemic maintenance gives a faster signal than weight maintenance.
Answer first: the maintenance dose is the lowest one that holds the result, and finding it is a downward search rather than an upward one.
Glycaemic maintenance has a faster and cleaner signal than weight maintenance, particularly with continuous monitoring, which makes the downward search more tractable when glycaemia is the endpoint.
To be exact about it, the maintenance dose is not necessarily the same a year later, since the counter-regulatory response attenuates slowly if at all.
The counter-regulatory hormonal response to weight loss persists for at least a year after the loss, which is the physiological reason maintenance needs something rather than nothing.
The lowest dose that holds the result is the answer, and it is individual.
Any reduction takes four to five weeks to express itself, so the search proceeds in months.
If the result deteriorates on a lower dose, returning to the previous one is straightforward and does not require re-titration from the bottom provided the gap has been short.
Dose-response for weight in the trial programmes was real but flattening at the upper end, which is consistent with a lower maintenance requirement.
Inference from the withdrawal trials to dose reduction is inference and should be labelled as such.
Going back up after a short gap does not require re-titrating from the bottom.
edited 12 Nov 2024 by Dr_Ilse_Vandenberg — added a caveat about sampling
The short version: reach a working dose, hold it, and then consider whether less would hold it just as well.
Gastrointestinal tolerability generally improves on a reduced dose, which is a genuine quality-of-life argument for the search rather than only a cost one.
Nothing here is medical advice, and research-use compounds are not approved for human use.
The withdrawal trials answer stopping, not reducing. Different questions.
Ask PeptideStack is a static archive. Posting is closed, but the norms are worth stating: answer the question that was asked, show your working, cite the trial or the certificate, and say plainly where the evidence runs out.