A reference post rather than a discussion. Corrections are the point; I would rather this be right than mine. It is about a missed or late dose, and it is deliberately narrow — everything I am not confident about is marked as such.
What is actually established
With a one-week half-life a dose three days late does not reset anything — you are dosing onto roughly half the previous concentration rather than a third, and the practical effect is a slightly larger effective step. The usual guidance is to take it if you are within about five days and to skip it and resume the schedule if you are past that, because a dose taken two days before the next one stacks exposure.
The condition it depends on
That works for the weekly agents. On a daily oral a missed dose is nearly irrelevant, which is a genuine and rarely stated advantage of the tablets.
The practical version
Practical rule most prescribers use for weekly dosing: within five days, take it and keep the original day; past five days, skip it and resume. Do not double.
What I am not sure about
What I actually want to know is whether a dose three days late resets the ladder or just shifts it. Not looking for reassurance. Looking for the part I have got wrong.
SarahChen_PharmD said:With a one-week half-life a dose three days late does not reset anything — you are dosing onto roughly half the previous concentration rather than a…
Agreed, and the adaptation point cuts both ways: tachyphylaxis to gastric emptying is why tolerability improves, and it is also why people who were relying on physical fullness feel the effect fade while the appetite effect is still working.
SarahChen_PharmD said:With a one-week half-life a dose three days late does not reset anything — you are dosing onto roughly half the previous concentration rather than a…
Missed dose question about a missed dose: I'm 3 days late on my injection. Should I take it now or wait until my regular day?
UPDATE: Called my provider — they said take it now and resume my regular schedule next week. Apparently being a few days late isn't a big deal as long as you don't double up.
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Shop Reference StandardsTaking the question as asked, rather than the general version of it. The mechanism is more central than most summaries suggest. Receptor agonism in the arcuate nucleus activates POMC neurons and inhibits AgRP/NPY signalling, and the downstream MC4R pathway is the same one disrupted in monogenic obesity — convergent genetic evidence that the target is the right one. Peripherally there is glucose-dependent insulin secretion, glucagon suppression and delayed gastric emptying, but the gastric component largely adapts over months while the central effect persists, which is why the durable effect is appetite rather than fullness.
If somebody has the primary source to hand I would rather cite it than paraphrase it.
mike_nyc said:Agreed, and the adaptation point cuts both ways: tachyphylaxis to gastric emptying is why tolerability improves, and it is also why people who were…
Mine went the same way, slower. The detail I would add is minor and it is already implied above.