Every letter we have printed
Page 67 of 77 of this archive, newest first.
On “Target dose, effective dose, and the distance between them” — Pharmacology, 8 May 2024
I want to object to the framing of dose reduction as measurement. In practice it is experienced as failure, and telling people it is a thermostat does not change how the appointment feels. The language problem is real and you have solved it rhetorically rather than actually.
— J. Kettleborough, Nottingham
A fair hit. We can describe the pharmacology accurately and still be writing at a distance from how the decision lands, and the paragraph you object to does both. The reframing is offered as a corrective to a stigma, not as a claim that the stigma is imaginary.
On “Target dose, effective dose, and the distance between them” — Pharmacology, 8 May 2024
You keep insisting on peptide content rather than purity when discussing dose certainty. I have looked at a dozen certificates from four different testing services and content is reported on perhaps a third of them. What are readers supposed to do with an absence?
— L. Whitcombe, Christchurch
Treat the nominal figure as an upper bound and say so out loud when reasoning about a dose. It is an unsatisfying answer and it is the honest one. We have argued in Analytics that content should be a standard reported field, and we will keep naming the services that report it and those that do not.
On “Target dose, effective dose, and the distance between them” — Pharmacology, 8 May 2024
Your piece treats the four-week step as arithmetic, and I accept the arithmetic, but my prescriber moved me up every two weeks and I reached the top dose without difficulty. I do not think the schedule is as constraining as you suggest.
— J. Mbatha, Durban
Nor do we, and the file should have been clearer. The four-week interval is a floor below which the previous rung is still accumulating, not a threshold below which escalation is unsafe. Plenty of people tolerate faster ascent. Our objection is to the inverse inference — that because you did, everybody should — and to the absence of a trial that would let anyone say which is which in advance.
On “Two analysts, one chromatogram, two answers” — Laboratory Notebook, 6 May 2024
Sub-two-micron columns changed everything about what is practical for peptide separations, but I would push back on the statement that particle size gains are costless. The pressure limit of most commercial instruments is three hundred bar, and trying to force 1.7-micron particles at eight millilitres per minute on a 4.6-millimetre column will send you there quickly. Peak capacity is not free.
— G. Thorbjørnsen, Tromsø
Correct on the pressure cost, and that belongs in the method section. The trade-off is real, which is why many laboratories use core-shell superficially porous particles as a compromise: they are substantially cheaper than sub-two-micron packings, deliver most of the efficiency gain at a lower pressure, and the efficiency-cost-pressure triangle is the actual business decision people make. We should have named it.
On “Two analysts, one chromatogram, two answers” — Laboratory Notebook, 6 May 2024
One practical note from the other side of the counter. When a customer asks us for the gradient we send it. When a customer asks a reseller, the reseller does not have it, because they were sent a PDF with a number on it. The gap you are describing is often two links down the chain rather than at the laboratory.
— C. Tremonti, Palermo
That is an important structural point and it changes where the fix has to happen. If the laboratory report travels intact instead of being transcribed into a house certificate, the method travels with it. Four of the twenty companies we track already attach the original report, and on this argument they are doing the single most useful thing available.
On “Where the solvent front ends is a decision, not a fact” — Analytics, 5 May 2024
One practical note from the other side of the counter. When a customer asks us for the gradient we send it. When a customer asks a reseller, the reseller does not have it, because they were sent a PDF with a number on it. The gap you are describing is often two links down the chain rather than at the laboratory.
— M. Halim, Kuala Lumpur
That is an important structural point and it changes where the fix has to happen. If the laboratory report travels intact instead of being transcribed into a house certificate, the method travels with it. Four of the twenty companies we track already attach the original report, and on this argument they are doing the single most useful thing available.
On “The shortage years, and what they taught about interruption” — The Ledger, 3 May 2024
As a prescriber I would push back on your framing of the maintenance gap. We are not practising without evidence; we are practising on pharmacological inference, which is what clinicians do in every field where the trial has not been run. Calling it unevidenced makes reasonable practice sound reckless.
— V. Bhattarai, Kathmandu
A fair objection and we have adjusted the wording. Our intention was to locate the absence with the people who could have funded the trial rather than with the clinicians managing without it, and on rereading the original paragraph did not achieve that.
On “The shortage years, and what they taught about interruption” — The Ledger, 3 May 2024
You say no dose-equivalence data exists between agents in this class. During the shortage my pharmacy substituted one for another on the basis of a conversion table they had printed from somewhere. Where would such a table have come from?
— N. Prasetyo, Surabaya
Almost certainly from cross-trial comparison of weight-loss percentages, which is not an equivalence basis. There is no head-to-head dose-titration study permitting conversion between these agents, and STEP 8 — the only head-to-head weight trial we know of — compared two agents at their own licensed doses rather than establishing equivalence between them.
On “The shortage years, and what they taught about interruption” — The Ledger, 3 May 2024
Your piece describes tapering as pharmacologically pointless and then spends three paragraphs making a case for it. Pick one.
— J. Delahunty, Waterford
Both, we think, and deliberately. There is no pharmacological rationale, because there is no withdrawal syndrome and a week-long half-life produces its own decline. There is a behavioural rationale, which is different in kind and untested. Our objection is to tapers advocated in pharmacological language, not to the practice.
On “The shortage years, and what they taught about interruption” — The Ledger, 3 May 2024
I lost access for eleven weeks during the shortage, restarted at the dose I had been on because nobody told me otherwise, and spent a fortnight unable to keep food down. I had been on that dose for seven months without difficulty. Reading your resumption section was the first time anybody explained it.
— P. Sarkissian, Beirut
It is entirely predictable from the label and the pharmacokinetics, and the failure to communicate it during the shortage period was systemic rather than individual. We are sorry it reached you this way and we are glad it reached you.
On “The incidence tables, read line by line” — Pharmacology, 3 May 2024
You report the STEP 1 nausea figure as approximately forty-four per cent. The publication gives 44.2 per cent. Given how much of your argument rests on precision about what these numbers mean, the rounding sits oddly.
— L. Dziedzic, Wrocław
Deliberate, and worth explaining. A tenth of a percentage point on a figure with a confidence interval several points wide implies a precision the data does not have. We give the exact figure in the tables and round in prose, which is a convention we should have stated rather than left to be noticed.
On “The incidence tables, read line by line” — Pharmacology, 3 May 2024
I stopped at week six because I could not keep anything down for three days, and my prescriber told me I had not given it a fair chance. Reading your definition of dose-limiting, I think what happened was that nobody offered me the option of going back to the lower dose. It was escalate or stop.
— E. Beauchamp, Ottawa, ON
That binary is the specific failure this file was written against. Stepping back a rung and re-approaching later is permitted in every pivotal protocol in this class and is absent from most conversations about it. We cannot comment on your care, but the framing you were given does not reflect either the trial conduct or the labelling.
On “The incidence tables, read line by line” — Pharmacology, 3 May 2024
A small point of precision. You use "gastroparesis" in the tag list and then spend a paragraph saying it is not a synonym for drug-induced emptying delay. That is a slightly awkward position to hold.
— H. Ravensworth, York
It is, and it is a compromise with how readers search. The tag exists because that is the word people use; the glossary exists because it is the wrong one. We would rather be findable and then precise than precise and unread.
On “What the trials counted as intolerance” — Patient Notes, 1 May 2024
You report the STEP 1 nausea figure as approximately forty-four per cent. The publication gives 44.2 per cent. Given how much of your argument rests on precision about what these numbers mean, the rounding sits oddly.
— C. Tremonti, Palermo
Deliberate, and worth explaining. A tenth of a percentage point on a figure with a confidence interval several points wide implies a precision the data does not have. We give the exact figure in the tables and round in prose, which is a convention we should have stated rather than left to be noticed.
On “What the trials counted as intolerance” — Patient Notes, 1 May 2024
I stopped at week six because I could not keep anything down for three days, and my prescriber told me I had not given it a fair chance. Reading your definition of dose-limiting, I think what happened was that nobody offered me the option of going back to the lower dose. It was escalate or stop.
— G. Thorbjørnsen, Tromsø
That binary is the specific failure this file was written against. Stepping back a rung and re-approaching later is permitted in every pivotal protocol in this class and is absent from most conversations about it. We cannot comment on your care, but the framing you were given does not reflect either the trial conduct or the labelling.
On “What the trials counted as intolerance” — Patient Notes, 1 May 2024
Your figures show diarrhoea at thirty-two per cent and constipation at twenty-three per cent in the same trial arm. I assumed one of these was an error until your mechanism section. It would be worth putting that explanation before the table rather than after it.
— E. Sørheim, Stavanger
On “What the trials counted as intolerance” — Patient Notes, 1 May 2024
I want to push back on the ginger paragraph. You describe the evidence as transferred from pregnancy and chemotherapy, which is accurate, and then include it in the table anyway. Either it belongs or it does not.
— H. Steinmetz, Basel
It belongs, labelled. The table is a map of what is recommended and on what basis, not a list of endorsements, and excluding widely used low-risk measures because their evidence is transferred would make the map less useful rather than more honest. We have made the column heading clearer.
On “What the trials counted as intolerance” — Patient Notes, 1 May 2024
You note that symptom burden does not predict weight outcome. This is the single most useful sentence I have read about this treatment. I spent four months believing that feeling well meant it was not working and considered increasing my dose on that basis alone.
— N. Villaseñor, Guadalajara
The folk model that suffering indexes efficacy is widespread and the published analyses do not support it. It is also actively harmful when it drives escalation, which is why we gave it a line in the closing section rather than burying it in the tables.
On “The intramuscular injection nobody intended” — Patient Notes, 1 May 2024
Nothing in this file addresses what to do when you realise mid-week that you have made an error. I gave double my dose on a Sunday and could find no guidance anywhere about what that meant.
— R. Devaney, Ballarat, VIC
A real gap and we will address it properly rather than in a reply. The short version is that it is a pharmacokinetic question — how much excess exposure, over what half-life — and a clinical one about symptom burden, and neither is answerable in the abstract. It also belongs in the titration file, which currently discusses omission and not excess.
On “Why the customs shed is the least documented step in this trade” — Laboratory Notebook, 28 Apr 2024
On amber glass: it is not merely cheap, it is standard in the wider chemical supply trade for anything with a chromophore. The fact that this market ships peptides in clear glass is a sign of who is doing the filling more than of any decision about photostability.
— C. Aguirre, Rosario
On “Why the customs shed is the least documented step in this trade” — Laboratory Notebook, 28 Apr 2024
Parcel 7 reached thirty-eight degrees for nearly four hours and you then tell readers not to worry unduly. I accept the solid-state argument. I would still like to know what the material looked like on analysis, and your article does not say.
— G. Rasmussen, Odense
A fair criticism of the reporting. Parcel 7 was submitted for purity determination on arrival and returned a figure within a percentage point of the supplier’s stated value, which is consistent with the solid-state argument and proves very little on its own, since we had no pre-shipment measurement on that vial. The design fault is ours: a shipment study without a paired baseline sample cannot answer the question we most wanted answered, and the next round will.
On “The isotope pattern tells you the charge, and the charge tells you the mass” — Explainers, 28 Apr 2024
You write that leucine and isoleucine cannot be distinguished by tandem mass spectrometry. That is too absolute. Side-chain fragmentation under high-energy conditions produces diagnostic w and d ions, and the discrimination has been demonstrated repeatedly.
— B. Tejeda, Santo Domingo
Correct, and the text has been amended. The discrimination is achievable under specialised conditions and is not available in any routine service this market uses, which is what we should have written rather than the stronger claim.
On “Why people actually stop, in the order they actually stop” — Patient Notes, 26 Apr 2024
You describe the maintenance strategy of stepping down one dose and holding for eight to twelve weeks as something clinicians report doing, and then say it is not a recommendation. That distinction will be lost on most readers, and printing the protocol makes you a source for it whether you intend to be or not.
— E. Adamou, Nicosia
This is the hardest editorial question this department faces and we do not think you are wrong. Our position is that a practice this widespread is better described accurately, with its evidentiary status stated, than left to circulate in fragments. We accept that the distinction does work that a reader may not do.
On “Why people actually stop, in the order they actually stop” — Patient Notes, 26 Apr 2024
I stopped eight months ago after reaching a weight I was happy with, and I have regained four of the twenty-two kilograms I lost. Every article I read told me to expect two-thirds back. I am not complaining, but I would like to know whether I am unusual or whether the two-thirds figure was always a mean concealing an enormous range.
— G. Kalinowski, Poznań
The second. The published interquartile ranges around those means are wide, and outcomes like yours are well within them. The trials were not designed to explain why some people hold weight after cessation and others do not, and nothing measured at randomisation predicts it usefully. You are not an anomaly; you are part of a distribution nobody quotes.
On “Blind duplicates: what happens when a laboratory does not know it is being…” — The Supply Chain, 25 Apr 2024
On the archive point: a public record of submissions by vendor would be gamed within a month. Vendors would submit under the names of resellers, or through intermediaries, and the archive would show a distribution as selected as the current one but with a veneer of completeness.
— R. Whitlam, Adelaide, SA
Probably true in part, and it is the strongest argument against our proposal. Our answer is that gaming requires effort and leaves traces, which the present arrangement does not, and that a partially gamed record is more informative than no record. We would not claim more than that.
On “Blind duplicates: what happens when a laboratory does not know it is being…” — The Supply Chain, 25 Apr 2024
VendorInvestigate does not measure anything and you have grouped it with three laboratories under the heading independent testing. That is exactly the conflation your article says the market makes.
— C. Rautenbach, Pretoria
A fair hit. The tag under which this coverage sits predates the distinction we now draw, and we have added the distinction to the second paragraph and to the table. The department name will follow at the next reorganisation of the site.
On “Blind duplicates: what happens when a laboratory does not know it is being…” — The Supply Chain, 25 Apr 2024
Your selection-effect model assumes a supplier publishes results above a fixed threshold. Real behaviour is surely more complicated: a supplier might publish a poor result on a batch it has withdrawn, or publish everything for a period to establish credibility and then stop. The arithmetic is fine and the behavioural assumption is a cartoon.
— D. Mazzarella, Catania
Agreed, and the figure caption now says illustrative arithmetic rather than model. The point survives the simplification, which is that a small amount of selection produces a large apparent effect, but we should not have dressed a demonstration as an estimate.
On “Blind duplicates: what happens when a laboratory does not know it is being…” — The Supply Chain, 25 Apr 2024
As a buyer I found the section on who chose the vial genuinely clarifying and slightly deflating. I have been treating vendor-published reports as equivalent to my own submissions for two years, and on your account they are not equivalent by an amount that cannot be measured.
— A. Mbeki, Lusaka
That is the correct reading, and the unmeasurable part is the honest part. We would add only that vendor-published reports are not worthless — a vendor willing to commission testing at all is behaving better than one that will not — they are simply weaker in a specific way.
On “Blind duplicates: what happens when a laboratory does not know it is being…” — The Supply Chain, 25 Apr 2024
You disclose that two of these services advertise with you and then spend four thousand words on structural criticism of the sector they operate in. I cannot decide whether that is admirable independence or an elaborate way of appearing independent. Probably the former. I wanted to say that I noticed the question.
— C. Adeoti, Ibadan
So do we, every time this department writes about the sector. The only answers we have are procedural: the disclosure, the standards desk edit, the consulting prohibition on the writer, and the practice of printing objections like yours unedited.
On “SURPASS-3 was built to answer the stopping question, and it did” — Clinical Trials, 25 Apr 2024
Your piece describes tapering as pharmacologically pointless and then spends three paragraphs making a case for it. Pick one.
— R. Sundaresan, Coimbatore
Both, we think, and deliberately. There is no pharmacological rationale, because there is no withdrawal syndrome and a week-long half-life produces its own decline. There is a behavioural rationale, which is different in kind and untested. Our objection is to tapers advocated in pharmacological language, not to the practice.
On “SURPASS-3 was built to answer the stopping question, and it did” — Clinical Trials, 25 Apr 2024
I lost access for eleven weeks during the shortage, restarted at the dose I had been on because nobody told me otherwise, and spent a fortnight unable to keep food down. I had been on that dose for seven months without difficulty. Reading your resumption section was the first time anybody explained it.
— R. Mothibi, Gaborone
It is entirely predictable from the label and the pharmacokinetics, and the failure to communicate it during the shortage period was systemic rather than individual. We are sorry it reached you this way and we are glad it reached you.
On “SURPASS-3 was built to answer the stopping question, and it did” — Clinical Trials, 25 Apr 2024
As a prescriber I would push back on your framing of the maintenance gap. We are not practising without evidence; we are practising on pharmacological inference, which is what clinicians do in every field where the trial has not been run. Calling it unevidenced makes reasonable practice sound reckless.
— P. Vuković, Split
A fair objection and we have adjusted the wording. Our intention was to locate the absence with the people who could have funded the trial rather than with the clinicians managing without it, and on rereading the original paragraph did not achieve that.
On “SURPASS-3 was built to answer the stopping question, and it did” — Clinical Trials, 25 Apr 2024
You say no dose-equivalence data exists between agents in this class. During the shortage my pharmacy substituted one for another on the basis of a conversion table they had printed from somewhere. Where would such a table have come from?
— L. Marulanda, Medellín
Almost certainly from cross-trial comparison of weight-loss percentages, which is not an equivalence basis. There is no head-to-head dose-titration study permitting conversion between these agents, and STEP 8 — the only head-to-head weight trial we know of — compared two agents at their own licensed doses rather than establishing equivalence between them.
On “Reflux, early satiety, and the volume the stomach will accept” — Pharmacology, 24 Apr 2024
Your figures show diarrhoea at thirty-two per cent and constipation at twenty-three per cent in the same trial arm. I assumed one of these was an error until your mechanism section. It would be worth putting that explanation before the table rather than after it.
— M. Guðmundsdóttir, Reykjavík
On “Reflux, early satiety, and the volume the stomach will accept” — Pharmacology, 24 Apr 2024
I want to push back on the ginger paragraph. You describe the evidence as transferred from pregnancy and chemotherapy, which is accurate, and then include it in the table anyway. Either it belongs or it does not.
— T. Blakemore, Hull
It belongs, labelled. The table is a map of what is recommended and on what basis, not a list of endorsements, and excluding widely used low-risk measures because their evidence is transferred would make the map less useful rather than more honest. We have made the column heading clearer.
On “What we asked twenty suppliers about stability data” — Laboratory Notebook, 23 Apr 2024
Your table of degradation pathways lists racemisation and then says it is essentially never reported. If it is never reported, on what basis do you list it as a real risk rather than a theoretical one?
— P. Ekundayo, Akure
On the basis of the synthesis and analytical literature, where epimer formation during solid-phase assembly and during storage at extremes of pH is well characterised. What is missing is not evidence that it occurs but evidence about how much of it is present in any particular commercial vial, which is a different absence and the one we should have named.
On “What we asked twenty suppliers about stability data” — Laboratory Notebook, 23 Apr 2024
The mean kinetic temperature explanation is the clearest I have read anywhere, including in the training my employer paid for. I have printed the sidebar and put it on the wall of the dispatch room.
— J. Wenninger, Graz
On “Residual stomach content on endoscopy: the studies” — Explainers, 23 Apr 2024
A small point of precision. You use "gastroparesis" in the tag list and then spend a paragraph saying it is not a synonym for drug-induced emptying delay. That is a slightly awkward position to hold.
— B. Wojciechowski, Kraków
It is, and it is a compromise with how readers search. The tag exists because that is the word people use; the glossary exists because it is the wrong one. We would rather be findable and then precise than precise and unread.
On “Residual stomach content on endoscopy: the studies” — Explainers, 23 Apr 2024
Nothing in your file addresses the social dimension, which for me was worse than the nausea. Six months of declining invitations to meals, and explaining to family why I was not eating. The tables do not have a row for that.
— B. Tejeda, Santo Domingo
On “Residual stomach content on endoscopy: the studies” — Explainers, 23 Apr 2024
You report the STEP 1 nausea figure as approximately forty-four per cent. The publication gives 44.2 per cent. Given how much of your argument rests on precision about what these numbers mean, the rounding sits oddly.
— R. Devaney, Ballarat, VIC
Deliberate, and worth explaining. A tenth of a percentage point on a figure with a confidence interval several points wide implies a precision the data does not have. We give the exact figure in the tables and round in prose, which is a convention we should have stated rather than left to be noticed.