m.agyeman

TL2 · Nantes

Contributes reviews on supplier material. Based in Nantes.

Joined 21 April 2025 · last posted 3d

93 posts, newest first. Showing up to 150.

Follow-up: Reading an interaction checker output critically Replied, post #64 · Practice › Interactions · 25 Jul 2026 · 1 like Post #63 answers the question as asked. The question underneath it is different. Insulin interaction: semaglutide and tirzepatide are not contraindicated with insulin…
Why retatrutide discussion here is more cautious than elsewhere — one year on Replied, post #80 · Compounds › Retatrutide · 21 Jul 2026 · 33 likes Heart rate increased in a dose-dependent way in the phase 2 work. That is not a footnote — it is one of the specific things phase 3 exists to characterise, and it is…
Coming back to: Delayed gastric emptying and oral medication absorption: which drugs… Replied, post #22 · Practice › Interactions · 13 Jul 2026 · 6 likes Thyroid medications: semaglutide is associated with a slowing of gastric emptying, which might affect thyroid medication absorption if they are taken very close…
Tracking a shortage from primary sources rather than rumour Replied, post #99 · Access › Shortages · 12 Jul 2026 · 9 likes Post #96 answers the question as asked. The question underneath it is different. The published shortage register maintained by the national regulator is the…
A revision dispute resolved on the topic rather than in the history Replied, post #12 · Meta › Wiki maintenance · 7 Jul 2026 · 0 likes Agreed. The revision notes are the only history a reader gets, so they are part of the document rather than metadata about it. If that reads as pedantic, it is, and it…
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #29 · Evidence › Journal club · 6 Jul 2026 · 0 likes The most useful thing anyone has posted about SUSTAIN 6 in this category was a table of what had been measured and by whom. That is what I would want again.
Ultrasound and skinfolds: operator dependence in practice Replied, post #40 · Outcomes › Body composition · 2 Jul 2026 · 2 likes The question underneath ultrasound and skinfolds is usually "how would I tell?" rather than "what is true?", and that one has a method attached to it. Write down what…
Prescription portability between countries Replied, post #78 · Access › International · 27 Jun 2026 · 25 likes Coming back to post #76, because the follow-up matters more than the original answer. Customs practice varies between entry points within the same country, which is why…
Personal or family history of medullary thyroid carcinoma — what changed since Replied, post #84 · Safety › Contraindications · 23 Jun 2026 · 0 likes Somebody's condition being on a list does not settle the decision, and somebody's condition being absent from one does not either. Worth one more sentence than it…
An appeal that succeeded, with the letter structure — the long version Replied, post #95 · Access › Insurance & coverage · 14 Jun 2026 · 1 like Adding the measurement that post #92 says would settle it. Appeal would be much easier to settle if anyone reported the denominator. Almost nobody reports the…
Documenting a supplier's response to a discrepancy Replied, post #12 · Sourcing › Vendor reports · 10 Jun 2026 · 9 likes What "verified" means on our pages: specific lots were independently measured on stated dates by named services and results were consistent with the supplier's…
Injecting into an area that has become firm: why not to Replied, post #36 · Practice › Administration · 8 Jun 2026 · 8 likes Answering the question post #34 raises rather than the one it answers. Bleeding at the site is common and unremarkable at these needle gauges. Persistent bruising in…
Type 2 diabetes and the largest part of the evidence base — does this still hold? Replied, post #13 · Clinical › Comorbidities · 6 Jun 2026 · 15 likes Post #10 answers the question as asked. The question underneath it is different. Counterpoint on Type 2 diabetes, offered without confidence: the same observation is…
Reading a trial's population section before its results Replied, post #77 · Evidence › Trials · 1 Jun 2026 · 5 likes Composite endpoints should be read component by component. A composite driven entirely by its softest component is a different finding from one where the components…
Follow-up: Tirzepatide and nausea: is the profile genuinely different or just… Replied, post #103 · Compounds › Tirzepatide · 29 May 2026 · 28 likes Acknowledging rather than arguing. The reasoning holds as far as I can follow it.
Follow-up: A parcel that arrived warm: a decision process, not a verdict Replied, post #46 · Practice › Storage & stability · 28 May 2026 · 5 likes Answering the question post #42 raises rather than the one it answers. Visible particulate is a strong signal in the other direction: it is a reason to stop and ask…
Reconstitution volumes that produce round numbers, tabulated Replied, post #105 · Practice › Reconstitution · 2 May 2026 · 4 likes Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and neither helps a peptide go into solution any faster than patience does.
[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #22 · Devices › Syringes & needles · 11 Apr 2026 · 9 likes Graduation spacing is worth checking before you buy rather than after. Some 1 mL barrels are marked every two units and some every one, and that changes what doses you…
Journal club: is percentage weight change the right endpoint? Replied, post #34 · Evidence › Journal club · 2 Apr 2026 · 11 likes Reading order that works for these sessions: registry entry, methods, baseline table, primary result, then abstract last. Reading the abstract first anchors everything…
Choosing which test to pay for, given a fixed budget Replied, post #26 · Sourcing › Independent verification · 15 Mar 2026 · 33 likes Post #22 and I disagree about the size of the effect, not about the direction. Repeat testing: if you want to verify the same lot a second time, testing with a…
Anaesthesia and elective surgery: the aspiration question Replied, post #51 · Practice › Interactions · 15 Mar 2026 · 0 likes Nothing here is medical advice and an interaction question is one where the cost of a wrong forum answer is genuinely high. Ask the prescriber or the pharmacist.
[2026 update] Charge states for a 4 kDa peptide, worked through Replied, post #9 · Analytics › Mass spectrometry · 15 Mar 2026 · 28 likes Fine by me. I had wanted a stronger conclusion and there is not one available.
Reading a preclinical wound-healing model and its relevance to a human tendon — a second… Replied, post #59 · Compounds › Repair & healing peptides · 14 Mar 2026 · 30 likes Post #56 answers the question as asked. The question underneath it is different. What would change my mind on Reading a preclinical wound-healing model is a second…
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #8 · Evidence › Journal club · 12 Mar 2026 · 0 likes Adding the measurement that post #5 says would settle it. Worth stating the null on indirect comparison before we explain it: the observation may be nothing. That…
Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #142 · Compounds › Semaglutide · 12 Mar 2026 · 0 likes I read post #140 twice before replying, because I had assumed the opposite. On the injection-day question: the labelling for licensed semaglutide allows the day to be…
Pharmacy supply in the UK and the questions you will be asked Replied, post #70 · Regional › UK & Ireland · 10 Mar 2026 · 18 likes Supply and shortage resilience: both UK and Ireland sourced primarily from European suppliers until recent disruptions. Domestic availability and pricing changed.
Journal club: SURMOUNT-4 and continuation versus withdrawal Replied, post #5 · Evidence › Journal club · 9 Mar 2026 · 29 likes Since SURMOUNT-4 and continuation versus withdrawal keeps coming up, it should probably be a maintained page rather than a recurring thread. I am happy to draft it if…
Second pass at: What "verified" means on our vendor pages, stated narrowly Replied, post #76 · Sourcing › Vendor reports · 2 Mar 2026 · 5 likes Post #72 put the caveat in the right place and I want to underline it. Reports of ordinary results are more valuable than reports of remarkable ones, precisely because…
Adducts: sodium, potassium, and the peak you did not expect — does this still hold? Replied, post #52 · Analytics › Mass spectrometry · 28 Feb 2026 · 10 likes Reading back through, this was answered upthread and I missed it. My fault.
Cost per delivered dose, which is the number that matters Replied, post #48 · Access › Pricing · 14 Feb 2026 · 6 likes Marking my place. If it changes for me I will come back and say so.
Follow-up: Bug report: the reconstitution calculator and a rounding edge case Replied, post #46 · Data & Tools › Calculators · 13 Feb 2026 · 1 like Coming back to post #45, because the follow-up matters more than the original answer. Reconstitution calculator: enter vial mass, final volume target, and the…
Adolescents: a distinct evidence base — one year on Replied, post #63 · Clinical › Special populations · 10 Feb 2026 · 0 likes Adolescents was covered in the wiki last year and the page has a review date on it, which is a better starting point than my memory of a thread.
Coming back to: Washout: how long is long enough, and for what purpose Replied, post #30 · Pharmacology › Pharmacokinetics · 1 Feb 2026 · 0 likes Coming back to post #28, because the follow-up matters more than the original answer. Washout was covered in the wiki last year and the page has a review date on it,…
Validating a calculator against hand arithmetic Replied, post #2 · Data & Tools › Calculators · 19 Jan 2026 · 0 likes Adding the measurement that the opening post says would settle it. Reporting bugs: if you notice a calculator giving wrong results, report it in this subcategory. Bugs…
Muscle cramps: the ordinary causes before the exotic ones Replied, post #17 · Practice › Side effects · 14 Jan 2026 · 19 likes Taking post #14 at face value and following it one step further. Muscle cramps came up in a thread eighteen months ago and was answered well. I cannot find it, which is…
Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one Replied, post #102 · Compounds › Oral incretins · 20 Dec 2025 · 4 likes Tablet integrity matters more than people expect for a formulation that depends on an absorption enhancer released at a particular place. Splitting or crushing is not a…
Warfarin and altered intake: the monitoring argument — the long version Replied, post #65 · Practice › Interactions · 9 Dec 2025 · 0 likes Taking post #62 at face value and following it one step further. Gastrointestinal symptoms from one compound can mask or mimic an interaction with another. Introducing…
Run-in periods and the population they select Replied, post #30 · Evidence › Trials · 3 Dec 2025 · 1 like Everything in post #26 holds. The case it does not cover is the one I have. I would keep run-in periods and the decision it usually gets used for separate in this…
Prescription requirements and telehealth models Replied, post #44 · Sourcing › Regulatory · 2 Dec 2025 · 19 likes An update on my earlier prescription requirements and telehealth models post: the pattern held for another six weeks and then stopped, which I did not predict and…
Where to report an adverse event officially, by region — a second dataset Replied, post #112 · Safety › Adverse events · 9 Nov 2025 · 6 likes On post #108 — agreed on the reasoning, with one qualification. An event that is severe, unexpected or persistent should be assessed rather than reasoned about. The…
Coming back to: Resolution and tailing factor: real acceptance criteria Replied, post #107 · Analytics › HPLC & UHPLC · 14 Oct 2025 · 11 likes A methods point on Resolution and tailing factor rather than a substantive one: if the comparison is not like for like, the difference you are measuring is the…
New subcategory: rationale and scope Replied, post #13 · Meta › Announcements · 13 Oct 2025 · 0 likes Everything in post #11 holds. The case it does not cover is the one I have. Adding a null result on new subcategory. I looked, carefully, and found nothing, and null…
Follow-up: The decimal-point error, and the habit that catches it Replied, post #72 · Practice › Reconstitution · 4 Oct 2025 · 21 likes Post #70 answers the question as asked. The question underneath it is different. Preservative effectiveness is tested against a defined microbial challenge under…
Citing a preprint in a maintained document: our rule and its reasoning — does this still… Replied, post #103 · Evidence › Preprints · 3 Oct 2025 · 20 likes Citing a preprint is well covered in the tag pages, and the older discussions are better than the recent ones because they were argued out properly. Worth twenty…
Gauge and length selection for subcutaneous injection Replied, post #35 · Devices › Syringes & needles · 1 Oct 2025 · 3 likes Taking gauge and length selection seriously for a moment rather than deflecting: the honest position is that the community has observations and no controlled…
Payment method and the leverage it gives you, ranked Replied, post #73 · Sourcing › Payments · 25 Sep 2025 · 5 likes Practical answer on payment method, since the theoretical one is upthread: do the simplest check first, write down the result, and only then decide whether the…
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile… Replied, post #2 · Compounds › Semaglutide · 9 Sep 2025 · 18 likes The opening post is right about the mechanism and I think understates the practical bit. The opalescent appearance in semaglutide solutions is occasionally noted and…
Follow-up: Journal club: orforglipron phase 2 and the non-peptide question Replied, post #89 · Evidence › Journal club · 9 Sep 2025 · 3 likes Taking post #88 at face value and following it one step further. I read the earlier replies on orforglipron phase 2 twice before writing this, because I had assumed the…
Tirzepatide molecular mass and the charge states you would expect on ESI Replied, post #7 · Compounds › Tirzepatide · 24 Aug 2025 · 10 likes Content versus purity applies here as everywhere: a lyophilised vial can be highly pure and contain less peptide than the label states, because the balance of the mass…
AOD-9604 and the fragment hypothesis, revisited Replied, post #9 · Compounds › Other compounds · 16 Aug 2025 · 2 likes Speaking only to AOD-9604 as I have actually seen it, rather than as it is usually described: the effect is real, it is smaller than the thread suggests, and the…
Persistent vomiting and the threshold for seeking help Replied, post #19 · Safety › Adverse events · 16 Aug 2025 · 0 likes Source for the persistent vomiting figure, since it was asked for. It is in the discussion rather than the abstract, which is why the version circulating is stronger…
Specificity, linearity, accuracy, precision, range, robustness — with real criteria — a… Replied, post #19 · Analytics › Method validation · 15 Aug 2025 · 0 likes I read post #16 twice before replying, because I had assumed the opposite. The limit of quantitation determines what the impurity table can honestly contain. Peaks…
Fatigue in the first month: how much is the drug and how much is intake — what changed… Replied, post #34 · Practice › Side effects · 15 Aug 2025 · 25 likes Where I would push back on the Fatigue consensus is the confidence, not the direction. The direction looks right. The confidence is borrowed.
Coming back to: When "no data" is the complete and final answer Replied, post #81 · Compounds › Other compounds · 12 Aug 2025 · 0 likes Noted, and I have changed what I was going to do on the strength of it.
When a preprint is the best available evidence and we say so Replied, post #25 · Evidence › Preprints · 5 Aug 2025 · 14 likes Building on post #22 rather than restating it. Author track record is a weak signal and it is a signal. A group that has published carefully for years is a different…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #31 · Documentation › Doc review · 26 Jul 2025 · 0 likes The four criteria are that the question recurs, that the content is correct and sourced or labelled as community practice, that somebody will be named as maintainer…
Antibiotics and a course of something with delayed emptying Replied, post #61 · Practice › Interactions · 9 Jun 2025 · 5 likes Where I part company with post #59, and it is a narrow parting. Where a published interaction study exists it usually reports an area-under-curve ratio, and that number…
Coming back to: Official shortage notices and what they authorise Replied, post #21 · Access › Shortages · 4 Jun 2025 · 1 like Post #17 and I disagree about the size of the effect, not about the direction. Regional differences during a shortage are large, and a supply position in one country…
Pre-registering a personal experiment, seriously Replied, post #97 · Research Methods › N-of-1 designs · 2 Jun 2025 · 3 likes Order effects matter. If you always try A before B, you cannot separate the treatment from the sequence, and alternating is cheap.
Pre-registering a personal experiment, seriously Replied, post #72 · Research Methods › N-of-1 designs · 1 Jun 2025 · 22 likes Everything in post #69 holds. The case it does not cover is the one I have. It does not tell you about anybody else, which is why aggregating these accounts does not…
Price changes over 2025 and 2026, tabulated and dated Started this topic · Access › Pricing · 23 May 2025 · 5 likes Posting this under the heading it deserves: Price changes over 2025 and 2026, tabulated and dated Everything below is what sits behind that. Documenting an access…
[2026 update] What the GIP component of tirzepatide is thought to contribute, and how… Replied, post #57 · Compounds › Tirzepatide · 20 May 2025 · 8 likes What I can speak to on GIP component of tirzepatide is narrow, so I will keep it narrow rather than generalising from it. Beyond that boundary I do not know.
Journal club: SURMOUNT-1, read without the press release Replied, post #115 · Evidence › Journal club · 12 May 2025 · 0 likes Post #113 put the caveat in the right place and I want to underline it. Worth stating the null on SURMOUNT-1 before we explain it: the observation may be nothing. That…
Foaming during reconstitution and whether it matters Replied, post #12 · Practice › Reconstitution · 11 May 2025 · 4 likes Confirming post #10 from a second method, which matters more than confirming it from a second person. What I can speak to on foaming during reconstitution is narrow, so…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #85 · Evidence › Journal club · 21 Apr 2025 · 28 likes The figures usually contain the finding and the text usually contains the interpretation. Separating them for the first twenty minutes is a discipline worth keeping.…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #64 · Evidence › Journal club · 20 Apr 2025 · 1 like Offering a way to settle STEP 1 rather than another opinion about it. Two measurements, taken the same way, a fortnight apart. If the difference is within the noise,…
Reading order for a first week here, and what to skip until later Replied, post #88 · Start Here › Welcome · 18 Apr 2025 · 0 likes On the reading order question specifically: start with the how-to-ask materials in this category, then read the one to three subcategories where your main questions…
Adjudicated events and why the definition matters — the long version Replied, post #86 · Evidence › Trials · 7 Apr 2025 · 12 likes Picking up post #83: that is the part I would want checked first. Absolute and relative effects answer different questions. Write down the event rate in each arm and…
Why cagrilintide alone is discussed so much less than in combination Replied, post #109 · Compounds › Cagrilintide & amylin analogues · 4 Apr 2025 · 2 likes That is clearer than the version I had in my head. Thank you.
Documenting a supplier's response to a discrepancy — does this still hold? Replied, post #46 · Sourcing › Vendor reports · 2 Apr 2025 · 4 likes Dosing and purity: a vial that is 99% pure might contain 80% of its label claim if the other mass is water, counter-ion, and excipient. Purity and content are…
Why cagrilintide alone is discussed so much less than in combination Replied, post #82 · Compounds › Cagrilintide & amylin analogues · 1 Apr 2025 · 0 likes Taking post #79 at face value and following it one step further. Combination products complicate the certificate question considerably. Two active components mean two…
What SELECT changed about how semaglutide is discussed, and what it did not Replied, post #58 · Compounds › Semaglutide · 30 Mar 2025 · 18 likes Practical note on SELECT: write down what you expect before you look. The number of times I have found what I went looking for is higher than chance would allow.
One lot is one lot: when a report becomes a pattern — the long version Replied, post #149 · Sourcing › Vendor reports · 19 Mar 2025 · 8 likes Reports of ordinary results are more valuable than reports of remarkable ones, precisely because only the remarkable ones get posted elsewhere.
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since Replied, post #33 · Practice › Reconstitution · 17 Mar 2025 · 0 likes Coming back to post #32, because the follow-up matters more than the original answer. A 10 mg vial reconstituted three different ways: 1 mL diluent gives 10 mg/mL, 2 mL…
Counter-ion form: the field almost nobody reports — one year on Replied, post #74 · Analytics › COA interpretation · 12 Mar 2025 · 0 likes Two claims get bundled together under Counter-ion form and they need separating. The descriptive one — this is what was observed — is usually well supported. The causal…
Distinguishing a deletion sequence by mass alone Replied, post #96 · Analytics › Mass spectrometry · 16 Feb 2025 · 24 likes Coming back to post #92, because the follow-up matters more than the original answer. Calibration matters: a high-resolution instrument out of calibration can report…
Revisiting: Bug report: the reconstitution calculator and a rounding edge case Replied, post #91 · Data & Tools › Calculators · 15 Feb 2025 · 4 likes The most common input error is entering the vial mass in the concentration field. It produces a plausible number, which is why it survives.
Books and papers worth reading that are not about this at all Replied, post #11 · Lounge › Off topic · 5 Jan 2025 · 0 likes A digression that keeps occurring to me: the most-linked documents here are the dullest ones. Nothing gets cited like the unit-arithmetic page. The honest answer is…
Persistent vomiting and the threshold for seeking help — one year on Replied, post #27 · Safety › Adverse events · 21 Dec 2024 · 23 likes Nothing here is medical advice, and in this subcategory the phrase is doing more work than in any other on the site.
Injection-site reactions: describing them precisely enough to be useful Replied, post #86 · Practice › Side effects · 19 Dec 2024 · 2 likes Building on post #83 rather than restating it. I have been on both sides of the injection-site reactions argument in this category within eighteen months, which should…
Follow-up: Where the four-week escalation interval comes from, and what it is not Replied, post #125 · Practice › Dosing & titration · 13 Dec 2024 · 29 likes Acknowledging rather than arguing. The reasoning holds as far as I can follow it.
Why our vendor pages link the storefront and mark it sponsored Replied, post #16 · Sourcing › Vendor reports · 10 Dec 2024 · 33 likes Adding the measurement that post #13 says would settle it. Posting my vendor pages link the storefront numbers with the method attached so they can be discounted…
What we do not know about retatrutide, listed explicitly Replied, post #12 · Compounds › Retatrutide · 4 Dec 2024 · 0 likes Noted, and I have changed what I was going to do on the strength of it.
Reading a preclinical wound-healing model and its relevance to a human tendon Replied, post #84 · Compounds › Repair & healing peptides · 18 Nov 2024 · 2 likes Answering the question post #80 raises rather than the one it answers. One caution on reading a preclinical wound-healing model: everything above assumes the underlying…
Meeting a protein target on a suppressed appetite — does this still hold? Replied, post #3 · Nutrition & Training › Protein & intake · 12 Nov 2024 · 0 likes Building on post #2 rather than restating it. The practical problem is that appetite suppression makes hitting a target genuinely hard, and "eat more protein" ignores…
Identical chromatograms across two different lots Replied, post #39 · Sourcing › Red flags · 20 Oct 2024 · 23 likes The strongest single signal available cheaply is what happens when you ask a technical question. A quantitative answer inside a working day is difficult to fake at…
Research-use-only labelling: what it means and what it does not — the long version Replied, post #14 · Sourcing › Regulatory · 20 Oct 2024 · 26 likes Research-use-only material is not approved for human use anywhere. That is a statement about the material's regulatory category rather than about its quality. Reading…
About the International category Replied, post #4 · Access › International · 7 Oct 2024 · 0 likes Suggestion for the wiki post above: it would be worth linking the two or three most-referenced topics in this category directly, since new members reliably ask for…
Pen wastage and its effect on real cost Replied, post #32 · Access › Pricing · 7 Oct 2024 · 2 likes Same experience here, different supplier, so it is at least not unique to one of them.
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #59 · Clinical › Bloodwork · 26 Sep 2024 · 0 likes Post #56 is the version of this I will quote in future. One addition. Bringing the actual numbers with intervals to an appointment is far more useful than describing…
Progressive overload when the scale is falling — one year on Replied, post #78 · Nutrition & Training › Resistance training · 21 Sep 2024 · 0 likes Post #74 put the caveat in the right place and I want to underline it. Progressive overload has been discussed here with more heat than it deserves, mostly because two…
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #32 · Analytics › COA interpretation · 20 Aug 2024 · 14 likes Post #30 put the caveat in the right place and I want to underline it. What I would want before treating field-by-field walk through a certificate as settled: the…
Assessing a warm arrival: the decision process — one year on Replied, post #122 · Sourcing › Logistics · 2 Jun 2024 · 17 likes Coming back to post #120, because the follow-up matters more than the original answer. Import restrictions by jurisdiction: what is legal to import for personal use…