May 2024

What the anaesthetists said, and then said again

The evidence is real, modest, and mostly retrospective. The guidance is correspondingly cautious and has been revised toward…

Escalating past the approved maximum, examined honestly

Where the curve flattens, what flattens with it, and what does not.

Holding the dose before surgery: for whom, for how long

This is the single interaction with ordinary medical care that patients most need to disclose, and it is the one most often not…

Gastric emptying is a mechanism, not a side effect

The central effects are not a bonus. On the current evidence they are the principal mechanism of weight loss.

Background rates, and why they matter for attribution

A small number of serious gastrointestinal events occur in people taking these drugs. Distinguishing them from the expected…

Target dose, effective dose, and the distance between them

What the trials measured was continuation against withdrawal. What patients want to know is continuation at a lower dose, and…

The incidence tables, read line by line

Trial adverse-event tables count episodes reported to a study nurse. They are the best data we have and they systematically…

Custody, condition and the temperature nobody logged

What a laboratory can and cannot know about the provenance, storage history and representativeness of what lands on its bench.

The anatomy of the most reproduced page in this trade

Nothing on this page is difficult. It is simply unfamiliar, and unfamiliarity is what makes a weak certificate look like a…

Twenty-eight days is a number from somebody else’s product

Every degradation pathway accelerates by orders of magnitude on reconstitution, because the solvent that lyophilisation removed…

What twenty companies say about storage, and what they have measured

A stability programme needs a protocol, defined conditions, a stability-indicating method and time. Time is the ingredient no…

Who signed this, and what did they undertake by signing it

Two signatures — one who performed the work, one who approved its release — are the ordinary regulated convention and are almost…

The fourteen-day problem, and what it does to a commercial testing model

We asked all four services what they can determine, on what timescale, at what price, and under what accreditation. The answers…

The submitted sample: the weakest link in the whole system

The condition on arrival is recorded by some services and not others, and it is one of the more informative lines in a report.

What the protein literature actually shows, and in whom it was shown

Where the familiar figures come from, what populations they were measured in, and how far the extrapolation reaches.

Why "muscle-sparing" is a marketing term and not a measurement

The rule that a quarter of weight lost is lean tissue has been in textbooks for decades and does not survive close reading.

Why "muscle-sparing" is a marketing term and not a measurement

The rule that a quarter of weight lost is lean tissue has been in textbooks for decades and does not survive close reading.

What we would need to randomise to answer this properly

One randomised trial has combined a GLP-1 receptor agonist with supervised exercise. Its result is the single most useful piece…

Side effects, cost, supply, target: four reasons with four trajectories

Why the reason for stopping changes what happens afterwards.

Tapering: a word borrowed from drugs with withdrawal syndromes

These agents produce no dependence and no withdrawal syndrome. What a taper would be for is therefore a real question rather…

What STEP 4 tells us about maintenance, and what it does not

The commonest real-world strategy in this drug class is the least studied one.

Four ways a peptide comes apart

We describe each pathway in enough chemical detail to explain why it is invisible to the method the trade uses, because that is…

Endotoxin is not a microorganism, and killing the bacteria does not remove it

Three compendial method families are in routine use and a fourth, based on a recombinant enzyme rather than crab lysate, is now…

Quadrupole, time-of-flight, orbital trap: what each class can and cannot see

Every instrument specification quoted in an advertisement is a best case obtained on a calibration mixture, not on a submitted…

What the paperwork is for, and who it was designed to protect

The header identifies the batch, the table records the tests, and the footer says who is answerable. Two of the three are…

What a laboratory knows about the material it receives

Chain of custody, in a regulated setting, begins at sampling. Here it begins when the package arrives.

Endotoxin is not a microorganism, and killing the bacteria does not remove it

The limit for a parenteral product is calculable from the dose and the body weight in two lines. Almost nobody in this trade…

Where the solvent front ends is a decision, not a fact

We work through a single chromatogram twice, under two integration conventions, and show where the difference comes from.

The dose that got you here and the dose that keeps you here

What the labels permit, what clinicians do, and the size of the gap between them.

Maximum tolerated is not maximum approved

A plateau at an intermediate dose and a plateau at the maximum dose look identical from the outside and mean different things.

What the cagrilintide schedule assumes about a person it has never met

What the published pharmacokinetics permit, what the labels state, and where the two diverge.

Why people actually stop, in the order they actually stop

A supply interruption is a discontinuation with no notice, no taper and no plan. That is a distinct clinical situation.

The eighteenth month, and the conversation that should have happened in the third

Weight reduction in the long programmes flattens at roughly sixty to seventy-two weeks. The timing is consistent, predictable…

The lowest effective dose is a real concept with almost no data behind it

Every withdrawal trial compared full dose against nothing. The clinically interesting comparison — full dose against a reduced…

What the trials counted as intolerance

We set out the questions that distinguish a symptom to manage from a dose to change.

The intramuscular injection nobody intended

A 4 mm needle at ninety degrees without a skin pinch is adequate for essentially all adults. The persistence of 12.7 mm needles…

The submitted sample: the weakest link in the whole system

The condition on arrival is recorded by some services and not others, and it is one of the more informative lines in a report.

The lead-in, the randomisation, and the year that followed

The evidence on stopping is better than the evidence on almost anything else in this field, because somebody deliberately…

What the placebo arms of the withdrawal trials actually tell us

Three randomised withdrawal designs have tested what happens when treatment stops. Their results are consistent and they are…

The badge economy, and what it is actually certifying

What a verification mark would have to carry to be checkable: a date, a lot, a method, a submitter and a link to the report.

The dose that got you here and the dose that keeps you here

Every withdrawal trial compared full dose against nothing. The clinically interesting comparison — full dose against a reduced…

How a claim degrades between the bench and the listing

Every step between the laboratory report and the product page removes information, and the badge is the last step.

The shortage years, and what they taught about interruption

Real-world persistence figures, with their definitions stated, because the definitions are doing most of the work.

A tested vial is evidence about a vial

A result on one vial generalises to a batch only if the vial was drawn in a way that makes it representative — and nobody…

The figure of merit this trade chose, and the four it did not

Chromatographic purity is cheap, fast and comparable-looking. Those three properties, and not its usefulness, explain why it…

What VendorInvestigate is able to certify about a sealed vial, and what it is not

The Journal has read several hundred certificates from twenty companies. We set out what the documents actually cover, and what…

What we are not saying about anybody in this trade

None of what this piece asks for is commercially sensitive, and all of it is already known to whoever released the batch.

Why a dead-clean sterile filter can pass pyrogen straight through

The masking phenomenon known as low endotoxin recovery means a formulation can return a clean result while containing endotoxin…

How to audit an identity claim in five minutes

The regulated world states the method, the instrument, the convention and the tolerance. This market states a verdict.

Reading HbA1c in the presence of anaemia

A robust, cheap, standardised assay with a specific and well-catalogued set of failure modes, several of which are common in…

Two analysts, one chromatogram, two answers

We work through a single chromatogram twice, under two integration conventions, and show where the difference comes from.

Bone density during rapid weight loss: what is known, which is less than you would hope

Weight loss reduces bone mineral density at load-bearing sites. Whether that translates into fractures in this population is…

What the trials adjudicated, and how

We give background rates alongside trial rates, because an event occurring during treatment is not thereby caused by it.

One receptor, several signals: the case for reading retatrutide as a biased agonist

What the in-vitro data supports, what it does not, and where the extrapolation to a person begins.

Quadrupole, time-of-flight, orbital trap: what each class can and cannot see

Parts per million sound impressive until they are converted into daltons at the molecular weight of the thing being measured.

The effect profile, predicted from an expression map

The receptor populations that produce satiety and the ones that produce nausea overlap substantially. That is why the ceiling of…

Units, millilitres, milligrams: three scales on one small object

Insulin syringes are graduated in units on a convention that fixes 100 units to one millilitre. That convention says nothing…

What a mass spectrometer does to a peptide before it measures anything

The ionisation method determines the charge states you see, the adducts you must account for, and the modifications you might…

Gauge, pain and flow rate

Gauge affects pain and flow rate rather than depth. A finer needle is more comfortable and slower, and with a viscous solution…

Five things a purity figure cannot tell you

Aggregates dissociate in the mobile phase and are recorded as monomer. Only a size-based separation reports them.