stretching the interval to 8 or 9 days instead of exactly 7 — smoothing tool or just messing with steady state
See this a lot, usually framed as "saving product" or "spacing it out a bit". Genuinely asking the pharmacology people here: does nudging the interval to 8-9 days meaningfully change anything, or is 7±2 days basically inside the noise floor for a drug with a week-long half-life?
best — the order this archive was captured in
with a roughly one-week half-life, an 8-9 day interval vs a strict 7 is a fairly small perturbation to steady-state levels. not zero, but nowhere near as dramatic as people seem to worry about.
that matches my intuition, good to have it confirmed by someone who actually does this math for a living
the bigger practical risk with stretching intervals isn't the pharmacology, it's habit drift, an occasional 9-day interval becomes an occasional 12-day interval becomes an accidentally missed dose
this is exactly why I never stretch mine even a day, Sunday 8pm every single week, the discipline of the fixed schedule is worth more to me than any theoretical smoothing benefit
honestly this thread is talking me back into just being boring about it and keeping a fixed day, the habit-drift argument is more convincing than any PK argument for stretching
also worth flagging: "skipping a week entirely" is a different question from "stretching by a day or two" and I've seen people conflate them in other threads. skipping resets your escalation clock in a way a small stretch doesn't.
agreed with the distinction above. steady-state kinetics for a weekly dose with a week-long half-life are genuinely fairly forgiving of small day-to-day interval drift, that's part of why weekly dosing was viable as a format at all.
Good discussion, staying in pharmacology-explains-the-mechanism territory rather than "so is it fine if I do X", which is the right shape for this community.
counterpoint, "the pharmacology says it's fine" is exactly the kind of reasoning that got people doing all sorts of things with these drugs that weren't actually tested, plausible math isn't the same as safety data
fair pushback in general, though nobody in this thread claimed it as safety data, just as an answer to "does an 8-9 day gap meaningfully change blood levels", which is a narrower and more answerable question
that's a fair distinction, retracting the broader version of my objection
my own interval has wandered 6-9 days across a year of real life logistics and I genuinely can't tell any difference, though that's exactly the kind of thing noise would also produce
saving this thread, the skipping vs stretching distinction near the top was the actual thing I came here confused about
- 1with a roughly one-week half-life, an 8-9 day interval vs a strict 7 is a…5 comments in this branch · started by u/gradient_goblin