Four dose steps in, holding each one the full four weeks, and I am trying to work out whether the interval is a pharmacological requirement or a tolerability convention.
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.
The question I want answered is what the trials actually did with participants who could not tolerate a step, because that is the situation I am in and the protocol summaries skip it.
Numbers rather than impressions, if you have them.
Answering 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.
Correct me if the detail matters more than I have assumed.
VendorMark said: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…
That is right for the weekly injectables. For the daily agents the interval logic is different and the four-week convention does not transfer.
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Browse GL BiochemHealthEcon_DC said:Four dose steps in, holding each one the full four weeks, and I am trying to work out whether the interval is a pharmacological requirement or a…
Can confirm the pattern HealthEcon_DC describes. 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.
Happy to go further on any of that.
Adding the clinical framing, because it changes how the question reads.
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