Writing this once so I can stop repeating it across threads. It is about the titration schedule, and it is deliberately narrow — everything I am not confident about is marked as such.
What is actually established
Four weeks is the pharmacokinetics, not caution. With a one-week half-life you need four to five half-lives to reach steady state, so at two weeks you are dosing on top of a concentration that has not finished rising. Escalating then stacks exposure and you get the side-effect burden of the higher dose before you have seen the benefit of the current one.
The condition it depends on
One condition: holding indefinitely at a dose that is not doing anything is not patience, it is a stall with a nice name. The distinction is whether appetite has changed at all at the current step.
The practical version
The arithmetic in one line: half-life about a week, so steady state at four to five weeks, so a four-week interval is one steady state per step. Two-week intervals mean every step is dosed onto a rising curve.
What I am not sure about
So the question, as narrowly as I can put it: why the interval is four weeks rather than two, and whether a slower ladder gets to the same place. Happy to be told the question itself is wrong.
TomTeleRx said:Four weeks is the pharmacokinetics, not caution.
That is correct as far as it goes, and here is where it stops going. Holding longer is the underrated move. A step that is uncomfortable at week two is frequently comfortable at week six with no change in dose, because the gastric-emptying component tachyphylaxes while the appetite effect persists. Escalating at week two throws that adaptation away.
TomTeleRx said:Four weeks is the pharmacokinetics, not caution.
I disagree that the ladder is purely tolerability. The maintenance and regain data cluster at the top doses, so a ladder abandoned halfway leaves you outside the evidence base for the part that matters most — keeping it off.
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Shop Reference StandardsAnswering the narrow version, because the broad one does not have a single answer. The trials generally allowed a step to be held or reduced and then retried, and people who did that mostly arrived at the same place a few weeks later. The end point of the ladder is set by tolerability, not by a schedule, and there is no evidence that reaching the top faster produces a better outcome.
Dr.NateNeph said:A step that is uncomfortable at week two is frequently comfortable at week six with no change in dose, because the gastric-emptying component…
This is my experience too, for whatever a second data point is worth.