June 2024

Why your endoscopist wants to know about your injection

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

A missed dose, modelled: what happens to liraglutide concentrations over the following fortnight

Half-life, accumulation ratio and time to steady state are three separate quantities, and confusing them produces most of the…

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…

Three weeks off is a fresh start, whether or not you want one

Supply interruption is the commonest cause of unplanned re-titration in this market, and it is almost never framed that way.

Pancreatitis, obstruction, gallbladder: three things nausea can be

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

Adverse events by dose, adverse events by week

Almost every figure in circulation about tolerability comes from six publications. This is what they say.

Background rates, and why they matter for attribution

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

A schedule that bends does not break

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

The submitted sample: the weakest link in the whole system

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

What we asked twenty suppliers about stability data

A retest date says that material should be re-examined before use. An expiry date says it should not be used. The trade uses the…

What a batch number is supposed to mean

The interval between manufacture and analysis is the most under-read figure on the page, and the one most likely to matter by…

Adsorption, and the dose that stayed on the glass

Bacteriostatic water contains benzyl alcohol at 0.9 per cent, which inhibits microbial growth in a preserved multiple-dose…

What VendorInvestigate charges to answer the pyrogen question

Bacterial endotoxin is a heat-stable lipopolysaccharide from the outer membrane of Gram-negative organisms. It survives…

One column, one wavelength, one very large blind spot

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

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

What the Journal asks when a document arrives unsigned, and what the answers have been.

What we asked twenty suppliers about stability data

Storage instructions in this market are close to uniform and almost never accompanied by the study that would justify them.…

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

Density is a proxy for strength and an imperfect one, particularly when soft-tissue thickness over the measurement site is…

What a low result means when intake has halved

What the trials measured, which in the case of micronutrients is very little.

Not everybody regains at the same rate, and nobody knows why

Regain begins immediately, proceeds at a decelerating rate, and does not usually return to baseline within the observed…

Grams per kilogram of what? The denominator problem in protein guidance

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

Stepping down against stopping: two decisions treated as one

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

On-off cycling, and the argument from receptor biology that does not hold

The schedules in circulation, described accurately, with their evidentiary status attached.

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

The gap between a defensible recommendation and a confident one is where most of the harm in this subject lives.

Which results are findings and which are consequences of the weight loss

Three different explanations for the same abnormal number, and how to tell them apart.

Set the threshold at a tenth of a per cent and the small impurities vanish

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

What Medutest charges to answer the pyrogen question

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

The four testing services and the study none of them can run

What would make a difference is not a regulator. It is three lines on a certificate, all of which are already known to whoever…

The four testing services and the study none of them can run

Storage instructions in this market are close to uniform and almost never accompanied by the study that would justify them.…

The question no chromatogram has ever answered

Every certificate circulating in this market answers a question about molecules. Almost none answers a question about organisms,…

How a release document is put together in a regulated plant

The purity figure is the least informative line on a well-constructed certificate and the only line most buyers read.

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

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

Why people actually stop, in the order they actually stop

The trials studied planned withdrawal. Almost nobody stops that way.

Escalating onto a rising curve

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

Reading a barrel: the graduation that is not the one you think

We work through the arithmetic in full, because it is short, and because the errors it prevents are order-of-magnitude errors.

Sarcopenia is a diagnosis, not a synonym for losing lean mass

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

Rapid weight loss moves eight analytes for reasons that have nothing to do with the drug

Which movements are expected, which resolve, and which warrant investigation.

Reflux, early satiety, and the volume the stomach will accept

The clinical effect profile is almost fully predictable from where the receptor is expressed, which is unusual and useful.

Choosing a needle for a subcutaneous peptide

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

From vial to bench: what is recorded and what is assumed

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

Two-thirds back: the extension nobody expected to be the headline

The regain trajectories, arm by arm, with the estimands named.

What STEP 3 tells us about maintenance, and what it does not

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

The shortage years, and what they taught about interruption

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

The badge economy, and what it is actually certifying

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

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…

A tested vial is evidence about a vial

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

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

Almost every misreading of a laboratory panel is a misunderstanding of what a reference interval is and how much a result has to…

Pore size, particle size, and why peptides need the wide pores

A shallow gradient resolves impurities that a steep one runs into the parent peak. Both methods are legitimate; only one of them…

Reading a barrel in the wrong increments

We have catalogued what readers report, ranked by the size of the dosing error each produces.

The one-quarter rule, and the paper that took it apart

Almost every practical recommendation in circulation was established in a population that does not resemble the people now…

Micronutrient monitoring: which panel, how often, and on whose evidence

What the trials measured, which in the case of micronutrients is very little.

What “LC-MS: conforms” tells a reader, which is almost nothing

What the Journal asks for when it writes to a supplier about an identity claim, and how often it gets it.

A lyophilised peptide is not stable. It is slow.

We set out what the cycle does, in order, so that a reader can see which of its steps a rushed operation shortens first.

The mechanism behind the mechanism

What scintigraphy and breath-test studies established about emptying rate, and what they did not.

The half-life question, answered properly

What the pharmacokinetic data supports about dose timing, missed doses and interruption.

A schedule that bends does not break

Nausea and gastric delay attenuate over weeks at an unchanged dose. That single physiological fact is the entire justification…

What “LC-MS: conforms” tells a reader, which is almost nothing

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

The qualification chain nobody in this trade can show you

Accreditation to the international competence standard covers the scope a laboratory has been assessed for, which is not…

How a correct calculation becomes a wrong dose

We have catalogued what readers report, ranked by the size of the dosing error each produces.

The anatomy of the most reproduced page in this trade

The purity figure is the least informative line on a well-constructed certificate and the only line most buyers read.

Pancreatitis, obstruction, gallbladder: three things nausea can be

The features that should prompt urgent assessment, stated once and plainly.