What the GLP-1 receptor actually does when survodutide binds it
The receptor is expressed in more tissues than the popular account allows, and that is the whole story.
Explainers
Page 5 of 12 of this archive, newest first.
Page 5
The eighteenth month, and the conversation that should have happened in the third
What the trials measured was continuation against withdrawal. What patients want to know is continuation at a lower dose, and that study has largely not been done.
What a batch number is supposed to mean
A document is only as good as the chain that connects it to the material, and most chains here are two or three links longer than the paperwork admits.
A supply gap is a pharmacological event
One omitted dose is a labelling question. Four omitted doses is a clinical one. The two are routinely conflated.
The software decides what counts as a peak
Baseline placement under a tailing peak is a judgement call with a direct effect on the area. It is one of the few places where two competent analysts genuinely disagree.
The eighteenth month, and the conversation that should have happened in the third
What the trials measured was continuation against withdrawal. What patients want to know is continuation at a lower dose, and that study has largely not been done.
Gauge, pain and flow rate
Skin thickness at the standard injection sites is approximately two millimetres in adults and varies remarkably little with body mass. That single finding is why short…
How a correct calculation becomes a wrong dose
Almost every case involves a change — a new vial, a new syringe size, a new supplier — carried forward with an old number.
Retained gastric contents, and how a small finding became a large argument
A drug that delays gastric emptying complicates the assumption behind every fasting instruction in perioperative medicine. The professional bodies have moved twice on this…
Escalating onto a rising curve
What the published pharmacokinetics permit, what the labels state, and where the two diverge.
Electrospray, MALDI, and the choice that shapes every spectrum after it
The two ionisation techniques in general use produce different charge distributions, different adducts and different failure modes. Certificates almost never say which was…
Gauge, pain and flow rate
The insulin injection-technique literature is large, well conducted and directly transferable on questions of depth and tissue. We say where it stops transferring.
The eighteenth month, and the conversation that should have happened in the third
The dose-response curve in this class flattens near its top. That has direct consequences for whether the final rung is worth climbing.
Assay against a standard, or area per cent: two different questions
We asked the four independent testing services what standards they run against and what suitability criteria they apply. The answers are printed.
Four millimetres is enough, and the data says so
The insulin injection-technique literature is large, well conducted and directly transferable on questions of depth and tissue. We say where it stops transferring.
The tolerance was set by whoever wrote the certificate
The arithmetic of significant figures, applied to a document that routinely reports four of them.
Mapping a rotation that you will actually follow
A rotation scheme that is too complicated will not be followed. We describe the simple ones that are.
The figure of merit this trade chose, and the four it did not
A market that competes on one measurement will optimise that measurement. There are legitimate ways to raise a purity figure that involve no change to the product at all.
Holding a dose is a decision, not a failure
Every major phase 3 protocol in this class allowed escalation to be delayed for tolerability. Almost no product label explains the mechanics of doing so.
From milligrams in a vial to units in a barrel
A more concentrated reconstitution means smaller injection volumes, which means larger proportional errors from graduation, dead space and technique.