This gets cited here weekly, usually second-hand, so it is worth setting out what it does and does not establish.
Steady state is the thing most people miss. The terminal half-life is about a week, so every dose step takes four to five weeks to fully express itself. Judging a step at day ten is judging the ascent, not the plateau, and it is the single commonest reason people escalate before they needed to.
Where I think it is weakest: the subgroup findings are the part I trust least — with enough subgroups something is always significant, and these were not all pre-registered.
What I am trying to establish is how much of the between-person variation is pharmacokinetic and how much is just adherence measured badly. I would rather have one careful answer than five confident ones.
RetaRick_CA said:Steady state is the thing most people miss.
All true, with one condition: that curve is for people who reached the dose on schedule. Anyone who slowed the ladder for tolerability is on a different, flatter curve, and comparing yourself with the published mean will make you feel like a non-responder when you are not.
RetaRick_CA said:Steady state is the thing most people miss.
I will push back on the "any working dose is fine" framing. The maintenance evidence sits overwhelmingly at the top studied dose, and the extension data shows regain tracking dose reduction rather than tracking stopping. Holding low is reasonable; pretending it is evidentially equivalent is not.
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Shop Reference StandardsThis one has a reasonably settled answer, so here it is. The mechanism that matters here is not stomach emptying, it is central. GLP-1 receptor agonism in the arcuate nucleus stimulates POMC neurons and suppresses AgRP/NPY signalling, which is why the effect is appetite and food salience rather than physical fullness. Delayed gastric emptying largely tachyphylaxes over the first months; the appetite effect does not.
Dr.CardioMD said:All true, with one condition: that curve is for people who reached the dose on schedule.
That holds for the injectable. The oral formulation has different absorption behaviour and the dose numbers are not interchangeable, which is worth saying out loud because people quote them as if they were.
If somebody has the primary source to hand I would rather cite it than paraphrase it.