September 2025

Background rates, and why they matter for attribution

Pancreatitis is rare, was adjudicated in the outcome programmes, and did not show the imbalance early case reports suggested.

The limits of mechanism: why receptor data will not tell you who responds

A catalogue of open questions, with an assessment of how likely each is to be resolved.

Do you need the top of the ladder?

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

The limits of mechanism: why receptor data will not tell you who responds

A catalogue of open questions, with an assessment of how likely each is to be resolved.

The interventions with trial support, and the much longer list without

The intervention with the clearest evidence is the one nobody frames as an intervention: adjusting the dose.

The interventions with trial support, and the much longer list without

Dietary measures are widely recommended, plausible on mechanism, and supported mainly by observational data and clinical…

What the trials counted as intolerance

An effect is dose-limiting when it prevents adequate intake, prevents normal activity, or produces a risk of its own. Discomfort…

The header, the table and the signature block

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

How a claim degrades between the bench and the listing

Lot-level verification with a public report is a real and achievable thing. It exists in this market, on a minority of listings.

A vial can be 99.4 per cent pure and not sterile in the same afternoon

Purity, content, identity, sterility and endotoxin are five separate determinations. A single sheet of paper carrying one of…

An interlaboratory comparison nobody had run

The Journal submitted split samples from single lots to three assay services, under names unconnected to this publication, and…

What Medutest would need in order to certify sterility, and why it does not

A compendial sterility test takes fourteen days of incubation and consumes the containers tested. That timescale is incompatible…

Aggregation: the impurity your chromatogram dissolved before it looked

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

LAL, kinetic chromogenic, recombinant factor C: three ways to the same figure

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

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

A tour of the source literatures, with an assessment of how far each legitimately reaches.

The shortage years, and what they taught about interruption

Why the reason for stopping changes what happens afterwards.

The shortage years, and what they taught about interruption

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

What TRIUMPH-1 tells us about maintenance, and what it does not

Dose reduction is not withdrawal, and the trials that tested withdrawal cannot be read as testing it.

What the outcome trials measured in the kidney

Estimated glomerular filtration rate is a calculation with muscle mass in the denominator of its assumptions. In this population…

What a low result means when intake has halved

Micronutrient guidance for this drug class is borrowed almost entirely from post-bariatric surveillance, where the anatomy is…

Every fortnight, every third week, seasonally: an unstudied practice

What the exposure arithmetic says about a fortnightly schedule, and where the arithmetic stops being informative.

Retest date, expiry date, and the two conventions being confused

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…

Oxidation, and the peroxide that came in with the surfactant

Deamidation, oxidation, aggregation and hydrolysis account for nearly all of what happens to a peptide over time. Each has a…

Bacteriostatic water, sterile water, and the 0.9 per cent that makes the difference

An in-use period is established by a dedicated study on a specific formulation in a specific container at a specific…

Same mass, different molecule: why identity by mass is not identity

An isoaspartate rearrangement changes the molecule and not the mass. A method that confirms identity by molecular weight alone…

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

Accreditation is granted for a defined scope of methods. A laboratory can be properly accredited and the test on your…

Same material, different gradients, different answers

Duplicate submissions under different names test within-laboratory repeatability, which is a different quantity from…

Why the independent testing market grew a chemistry arm and not a microbiology one

The absence of microbiological capability in this market is a commercial fact with a straightforward explanation, and it is…

Escalating past the approved maximum, examined honestly

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

The intramuscular injection nobody intended

Skin thickness at the standard injection sites is approximately two millimetres in adults and varies remarkably little with body…

Continued treatment against continued placebo: the comparison that settled it

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

What STEP 4 and SURMOUNT-4 actually established

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

A unit is not a dose, and it never was

Dead space in the needle hub is a real and calculable loss, and it matters more at small volumes than anybody expects.

What STEP 4 and SURMOUNT-4 actually established

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

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

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

Discontinuation rates, read honestly

The ceiling varies severalfold between people, and nothing measurable at baseline predicts where it sits.

SURPASS-3 was built to answer the stopping question, and it did

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

Reproducibility, measured rather than assumed

The Journal submitted split samples from single lots to three assay services, under names unconnected to this publication, and…

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.

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

Cost is the modal reason for discontinuation in every dataset we have seen, and it is absent from the clinical literature.

Three services, one lot, and a spread of two and a half points

Two years ago we ran an anonymised version of this comparison and promised a named one. This is it, with every method printed in…

The supply gap as a clinical event

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

We split six vials four ways and posted them

The Journal submitted split samples from single lots to three assay services, under names unconnected to this publication, and…

The supply gap as a clinical event

Why the reason for stopping changes what happens afterwards.

EGFR, cystatin C, and the check on the check

The reference interval for alanine aminotransferase in most laboratories is derived from a population that included people with…

Fat mass fell more than lean mass. That is the finding, and it is not the headline.

What was pre-specified, what was exploratory, and what was calculated afterwards by people who did not run the trial.

Why a dry powder is a chemical reactor with the volume turned down

Residual moisture is measured routinely in regulated manufacture, is reported almost nowhere in this trade, and predicts…

The cake tells you something, and it is not purity

Multiple-dose vials are designed for a defined number of punctures. Nobody counts, and the elastomer does not care whether…

In-use periods, and the ones nobody can give you

Sharps disposal is a legal obligation in most jurisdictions and a safety obligation everywhere. Household waste is not a route.

Priming a pen is not optional

Aseptic technique here is four steps and none of them are difficult. They are, however, routinely compressed to two.

The out-of-range flag is a statistical convention with a printer attached

Two sources of noise sit under every number: how reproducible the assay is, and how much the analyte varies within the same…

The shelf life ends when the diluent goes in

At low concentrations a measurable fraction of peptide can adsorb to glass and plastic surfaces, and the loss is largest exactly…

The label says four weeks. The clinic says whatever holds.

The published ladder exists because a protocol needed a single number. Practice has never followed it exactly, and the…

Retest date, expiry date, and the two conventions being confused

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…

Gallstones during rapid weight loss: drug, or weight loss?

Pancreatitis is rare, was adjudicated in the outcome programmes, and did not show the imbalance early case reports suggested.

What the trial protocols permitted, and what the labels omitted

Reducing a dose is not going backwards. In a tolerability-limited class it is the mechanism by which the ceiling is found.

What column temperature does to selectivity

We set out the parameters a method disclosure would contain, all of which are known to whoever ran the sample and none of which…

Diminishing returns, quantified

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

The word “confirmed” is doing an enormous amount of work on this certificate

An intact mass measurement establishes elemental composition, at best. The number of distinct sequences consistent with a given…

Retention time is not identity

Matching a retention time against a standard is evidence of consistency, not proof of identity. Two different species can elute…