k.agyeman

TL2 · Haarlem

Contributes reviews on supplier material. Based in Haarlem.

Joined 28 February 2025 · last posted 3d

83 posts, newest first. Showing up to 150.

Coming back to: Delayed gastric emptying and oral medication absorption: which drugs… Replied, post #68 · Practice › Interactions · 25 Jul 2026 · 20 likes Reading rather than answering, but this is the post I would point somebody at.
Follow-up: Reading an interaction checker output critically Replied, post #62 · Practice › Interactions · 23 Jul 2026 · 25 likes Gastrointestinal symptoms from one compound can mask or mimic an interaction with another. Introducing two changes at once makes attribution impossible, which is an…
Journal club: what we got wrong in an earlier session Replied, post #100 · Evidence › Journal club · 19 Jul 2026 · 0 likes Reading a preprint in a session is fine provided the status is stated in the first minute and stays in the summary. That much is documented. The rest is how I have…
What consumer-accessible tests can and cannot determine — a second dataset Replied, post #99 · Analytics › Home & field testing · 18 Jul 2026 · 14 likes Ultraviolet absorbance at 280 nanometres estimates concentration for peptides containing aromatic residues and gives nothing for peptides that do not. Knowing which…
A revision dispute resolved on the topic rather than in the history Replied, post #14 · Meta › Wiki maintenance · 17 Jul 2026 · 17 likes Question for the editors: what is the standard for adding a citation to a claim that is community practice rather than published? At the moment those sentences are…
Coming back to: Delayed gastric emptying and oral medication absorption: which drugs… Replied, post #4 · Practice › Interactions · 7 Jul 2026 · 6 likes The practical advice most consistently given by pharmacists here is to keep the timing of other oral medication consistent rather than to change it, because consistency…
An 18-month record including the parts that went badly Replied, post #60 · Outcomes › Progress reports · 5 Jul 2026 · 7 likes Post #59 put the caveat in the right place and I want to underline it. The honest answer on 18-month record is that it depends, and the useful part is the list of what…
Coming back to: Solubility limits and what a cloudy solution is telling you Replied, post #36 · Pharmacology › Formulation chemistry · 1 Jul 2026 · 0 likes Post #33 is the version of this I will quote in future. One addition. Worth separating Solubility limits as a question about the compound from Solubility limits as a…
Naming conventions for research peptides and the confusion they cause Replied, post #22 · Compounds › Other compounds · 28 Jun 2026 · 0 likes On naming conventions for research peptides, I would rather understate and be corrected upward than overstate and be quoted. That is a house style here and it is a good…
Revisiting: The best-written scientific paper you have read Replied, post #32 · Lounge › Off topic · 14 Jun 2026 · 8 likes Practical note on best-written scientific paper: write down what you expect before you look. The number of times I have found what I went looking for is higher than…
Documenting a supplier's response to a discrepancy Replied, post #14 · Sourcing › Vendor reports · 13 Jun 2026 · 0 likes The cost of a submission is worth stating. It is the main reason people do not do this and knowing the figure helps somebody else decide. Flagging that the sources on…
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #58 · Compounds › Semaglutide · 10 Jun 2026 · 5 likes Same experience here, different supplier, so it is at least not unique to one of them.
Gastro-oesophageal reflux: improving or worsening? Replied, post #53 · Clinical › Comorbidities · 7 Jun 2026 · 15 likes Nothing here is medical advice and clinicians posting in this subcategory say so on their own account rather than because a rule requires it. The conclusion is…
Why the titration planner refuses to produce a schedule below a floor Replied, post #83 · Data & Tools › Calculators · 6 Jun 2026 · 17 likes Narrowing post #82, because the general version has more than one answer. Significant figures in the output should not exceed what the inputs support. A concentration…
A certificate whose chromatogram axes do not match its stated method — one year on Replied, post #73 · Sourcing › Red flags · 5 Jun 2026 · 23 likes The arithmetic in post #72 is right; the assumption feeding it is the part to check. Pressure to pay outside a normal channel is the practical warning that has nothing…
When your prescriber and the evidence disagree Replied, post #14 · Clinical › Prescriber conversations · 5 Jun 2026 · 0 likes This follows post #12 rather than contradicting it. The reason prescriber keeps being re-asked is that the answer is conditional and people quote it without the…
Documenting a payment dispute without naming and shaming Replied, post #10 · Sourcing › Payments · 4 Jun 2026 · 0 likes This follows post #8 rather than contradicting it. Payment mechanics: most suppliers accept bank transfer, crypto, and some accept credit cards. Each has different risk…
Follow-up: A parcel that arrived warm: a decision process, not a verdict Replied, post #17 · Practice › Storage & stability · 6 May 2026 · 6 likes Post #13 describes the usual case. This is about the unusual one. Clarity is a weak test. A solution can lose a significant fraction of its active content to…
Endotoxin and why it is a separate question from purity — what changed since Replied, post #11 · Analytics › Impurities & related substances · 4 May 2026 · 26 likes Source for the Endotoxin figure, since it was asked for. It is in the discussion rather than the abstract, which is why the version circulating is stronger than the…
Converting between mg/mL and units per dose, both directions — the long version Replied, post #101 · Practice › Reconstitution · 24 Apr 2026 · 1 like 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.
Grapefruit: why this class is not the class that cares Replied, post #138 · Practice › Interactions · 9 Apr 2026 · 0 likes Alcohol: no absolute contraindication but it raises gastrointestinal irritation risk and this drug class already does that. The conservative position during titration…
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #33 · Evidence › Journal club · 7 Apr 2026 · 7 likes TRIUMPH (ongoing): Retatrutide phase 3. No results yet. Nothing should be attributed to it because it has not finished. When it does, this discussion will return to it.…
Bug report: the reconstitution calculator and a rounding edge case Replied, post #24 · Data & Tools › Calculators · 4 Apr 2026 · 6 likes Post #23 is the version of this I will quote in future. One addition. The most common input error is entering the vial mass in the concentration field. It produces a…
Second pass at: Choosing a concentration on purpose rather than by accident Replied, post #54 · Practice › Reconstitution · 24 Mar 2026 · 1 like Choosing a concentration on purpose rather than by accident: starting with "I want to draw 0.5 mL per dose" and working backward to the required concentration is more…
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #16 · Evidence › Preprints · 23 Mar 2026 · 0 likes Peer review catches some things reliably — missing methods, unsupported conclusions, statistical mistakes of the obvious kind — and misses others routinely. Knowing…
Introducing myself: pharmacist, sceptic, reluctant participant — one year on Replied, post #104 · Lounge › Introductions · 18 Mar 2026 · 31 likes Nice to meet you. Say what you are interested in rather than what you do, if you would rather — plenty of people here are anonymous about their background and it costs…
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #10 · Evidence › Journal club · 16 Mar 2026 · 0 likes Post #9 answers the question as asked. The question underneath it is different. The most common failure mode is spending fifty minutes on the effect size and ten on the…
A fridge failure and how I assessed the contents afterwards Replied, post #4 · Devices › Cold chain · 12 Mar 2026 · 0 likes The opening post answers the question as asked. The question underneath it is different. Shipment during summer or to hot climates: consider shipping to a cold-storage…
Adducts: sodium, potassium, and the peak you did not expect — does this still hold? Replied, post #54 · Analytics › Mass spectrometry · 2 Mar 2026 · 0 likes Quantitation by MS: most quantitation is done by LC-UV detection at 214 nm, not by MS, because extinction coefficients are better known. MS can quantify if an internal…
What "marked as solution" means and who gets to mark it — does this still hold? Replied, post #46 · Start Here › Welcome · 24 Feb 2026 · 20 likes The Lounge is a real category rather than a dumping ground. The sourcing rule still applies there, which surprises people, but the register is looser and nobody minds a…
Dead volume across syringe and needle combinations Replied, post #72 · Devices › Syringes & needles · 15 Feb 2026 · 0 likes Taking post #69 at face value and following it one step further. Fixed versus detachable needles: insulin syringes usually have fixed needles (no dead volume loss to…
Follow-up: Bug report: the reconstitution calculator and a rounding edge case Replied, post #44 · Data & Tools › Calculators · 11 Feb 2026 · 17 likes That matches what I have seen, for whatever a single anecdote is worth.
Adolescents: a distinct evidence base — one year on Replied, post #61 · Clinical › Special populations · 4 Feb 2026 · 8 likes I had read the opposite somewhere and cannot now find where, which tells me something.
Validating a calculator against hand arithmetic Replied, post #4 · Data & Tools › Calculators · 2 Feb 2026 · 11 likes A saved calculation is worth more than a remembered one. Write down the inputs alongside the result, because the result alone is unverifiable a month later.
Revisiting: Absolute versus relative contraindications Replied, post #9 · Safety › Contraindications · 16 Jan 2026 · 2 likes The section of the product information covering special warnings is usually longer and more useful than the contraindications list itself.
The headache that turns out to be dehydration Replied, post #102 · Nutrition & Training › Hydration & electrolytes · 20 Dec 2025 · 8 likes Where I would push back on the headache consensus is the confidence, not the direction. The direction looks right. The confidence is borrowed.
How to read a phase 2 result without treating it as a phase 3 result Replied, post #28 · Compounds › Retatrutide · 19 Dec 2025 · 8 likes Anyone deciding on the basis of what is published should know that what is published is a phase 2 programme and some pharmacokinetics. That is a genuinely early…
About the Method validation category Replied, post #4 · Analytics › Method validation · 3 Dec 2025 · 23 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…
When to stop reading forums, including this one Replied, post #57 · Wellbeing › Mental health · 3 Dec 2025 · 0 likes The social side of this — how other people respond to visible change — comes up constantly and has nothing to do with pharmacology. Not the answer, but possibly the…
Prescription requirements and telehealth models Replied, post #42 · Sourcing › Regulatory · 1 Dec 2025 · 2 likes Building on post #39 rather than restating it. The strongest argument against my own position on prescription requirements and telehealth models, stated as well as I…
Thyroid function tests during substantial weight change Replied, post #140 · Clinical › Bloodwork · 19 Nov 2025 · 29 likes Checked the thyroid function tests during substantial claim against the primary source this morning. It survives, with a narrower scope than the version quoted here.…
Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #50 · Compounds › Semaglutide · 19 Nov 2025 · 26 likes Discontinuation rates in the trials are worth reading alongside efficacy and almost never are. A large mean effect in a population where a meaningful fraction stopped…
Follow-up: Constipation management, with a dietitian's contribution Started this topic · Practice › Side effects · 7 Oct 2025 · 0 likes Constipation management, with a dietitian's contribution — setting out what I have, and where I think it stops being reliable. A follow-up question about Constipation…
Revisiting: GLP-1 receptor distribution: central and peripheral Replied, post #48 · Pharmacology › Receptor biology · 5 Oct 2025 · 0 likes The arithmetic in post #45 is right; the assumption feeding it is the part to check. GLP-1 receptor agonism produces its metabolic effects through more than one route:…
Warfarin and altered intake: the monitoring argument Started this topic · Practice › Interactions · 4 Oct 2025 · 43 likes Warfarin and altered intake: the monitoring argument — setting out what I have, and where I think it stops being reliable. Proposing that warfarin and altered intake…
Research-use-only labelling: what it means and what it does not Replied, post #39 · Sourcing › Regulatory · 28 Sep 2025 · 0 likes Where a claim about legality is made here, the useful follow-up is which instrument it rests on. Most such claims turn out to rest on a forum post. Happy to expand any…
Which panel is worth repeating and which is worth ignoring Replied, post #119 · Clinical › Bloodwork · 24 Sep 2025 · 2 likes Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol in the evening. Comparing results from different times of day is…
Payment method and the leverage it gives you, ranked Replied, post #48 · Sourcing › Payments · 21 Sep 2025 · 11 likes Source for the payment method figure, since it was asked for. It is in the discussion rather than the abstract, which is why the version circulating is stronger than…
Second pass at: Programming during a large energy deficit Replied, post #2 · Nutrition & Training › Resistance training · 6 Sep 2025 · 1 like I read the opening post twice before replying, because I had assumed the opposite. Recovery capacity falls with energy availability, so a programme that worked at…
Tirzepatide molecular mass and the charge states you would expect on ESI Replied, post #20 · Compounds › Tirzepatide · 27 Aug 2025 · 9 likes Post #16 and I disagree about the size of the effect, not about the direction. Research-use-only tirzepatide is not approved for human use and is not made to…
Interpreting a composition change that is within the error bars Replied, post #22 · Outcomes › Body composition · 27 Jul 2025 · 0 likes Post #18 put the caveat in the right place and I want to underline it. The question underneath interpreting a composition change is usually "how would I tell?" rather…
Asking about a compound your prescriber has not heard of Replied, post #107 · Clinical › Prescriber conversations · 27 Jul 2025 · 26 likes Written summaries after an appointment are available in many systems and are worth asking for, because recollection of a consultation is unreliable. If the premise is…
An emergency department visit, described afterwards Replied, post #45 · Safety › Adverse events · 23 Jul 2025 · 11 likes I read post #43 twice before replying, because I had assumed the opposite. Attribution is genuinely hard for a single case and the reporting schemes are designed to…
Coming back to: Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #72 · Compounds › Semaglutide · 16 Jul 2025 · 0 likes Research-use-only semaglutide is not a licensed medicine, is not manufactured to pharmaceutical standards, and is not approved for human use. That is a statement about…
Comparing my trajectory with the trial curves, carefully Replied, post #23 · Outcomes › Progress reports · 11 Jul 2025 · 15 likes Progress reports that describe an ordinary trajectory are more useful than remarkable ones and are far rarer, because only the remarkable ones feel worth posting.
Repeatability versus intermediate precision Replied, post #106 · Analytics › Method validation · 30 Jun 2025 · 0 likes Reporting a result to more decimal places than the method's precision supports is a small dishonesty that appears everywhere. A method with a two per cent relative…
Coming back to: Why quantitation is the hard part, not detection Replied, post #32 · Analytics › Home & field testing · 29 Jun 2025 · 10 likes Thank you for the correction. I would rather find out here than later.
[2026 update] An appeal that failed, and what I would do differently Replied, post #69 · Access › Insurance & coverage · 11 Jun 2025 · 12 likes Confirming post #66 from a second method, which matters more than confirming it from a second person. Where an exception process exists separately from an appeal, they…
Pre-registering a personal experiment, seriously Replied, post #95 · Research Methods › N-of-1 designs · 2 Jun 2025 · 32 likes Pre-registering a personal experiment: I would want to see the raw numbers rather than the summary before agreeing. Summaries lose exactly the information that would…
Half-life, steady state, and accumulation worked through Replied, post #52 · Pharmacology › Pharmacokinetics · 1 Jun 2025 · 26 likes Accumulation at steady state: with a week-long half-life, steady-state concentration is reached around 4 to 5 half-lives (about 4 to 5 weeks). Before that,…
Holding a dose indefinitely: is there a documented downside? Replied, post #23 · Practice › Dosing & titration · 27 May 2025 · 32 likes Marking my place. If it changes for me I will come back and say so.
Follow-up: What other technical communities get right that we do not Replied, post #79 · Lounge › Off topic · 26 Apr 2025 · 25 likes Politics and public policy: healthcare policy that affects access to these compounds is relevant here. Partisan politics is not. Posted with less confidence than the…
Why cagrilintide alone is discussed so much less than in combination Replied, post #88 · Compounds › Cagrilintide & amylin analogues · 2 Apr 2025 · 7 likes The CagriSema phase 2 paper: a fixed combination of the two components in one weekly injection. The trade-off of a fixed combination is that you cannot titrate the…
Documenting a supplier's response to a discrepancy — does this still hold? Replied, post #44 · Sourcing › Vendor reports · 1 Apr 2025 · 0 likes Narrowing post #43, because the general version has more than one answer. Do not adjust a reported figure. Post what the laboratory said and put your interpretation in…
Why cagrilintide alone is discussed so much less than in combination Replied, post #63 · Compounds › Cagrilintide & amylin analogues · 30 Mar 2025 · 14 likes The honest summary of the evidence base: a coherent mechanism, good phase 2 data in combination, and much less standalone human data than the volume of discussion…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since Replied, post #35 · Practice › Reconstitution · 21 Mar 2025 · 19 likes Post #32 and I disagree about the size of the effect, not about the direction. The failure mode on 5 mg vial is boring rather than dramatic. It is almost always the…
Counter-ion form: the field almost nobody reports — one year on Replied, post #91 · Analytics › COA interpretation · 17 Mar 2025 · 1 like Answering the question post #87 raises rather than the one it answers. Reporting rather than recommending, on Counter-ion form. What happened is above. Whether it…
Preservatives: function, testing, and limits Replied, post #20 · Pharmacology › Formulation chemistry · 14 Mar 2025 · 0 likes No notes. Posting so the count is not one.
Counter-ion form: the field almost nobody reports — one year on Replied, post #72 · Analytics › COA interpretation · 11 Mar 2025 · 12 likes Taking post #69 at face value and following it one step further. Purity and content are different measurements: purity tells you what proportion of the detected…
Deamidation and the close-eluting pair it produces Replied, post #5 · Analytics › Impurities & related substances · 5 Mar 2025 · 10 likes I read the opening post twice before replying, because I had assumed the opposite. Racemisation produces a diastereomer that is mass-identical and chromatographically…
Validating a method you did not develop — does this still hold? Replied, post #59 · Analytics › Method validation · 1 Mar 2025 · 23 likes I came in to disagree and I am leaving without a disagreement.
What SELECT changed about how semaglutide is discussed, and what it did not Replied, post #23 · Compounds › Semaglutide · 27 Feb 2025 · 0 likes Taking post #20 at face value and following it one step further. Answering the SELECT question as asked, then the question I think is meant. As asked: yes, with the…
Canadian access and provincial variation Replied, post #58 · Regional › North America · 5 Feb 2025 · 11 likes Taking post #57 at face value and following it one step further. Trying to state the canadian access and provincial variation position in a way that someone who…
A page that has drifted out of date and needs a maintainer Replied, post #54 · Documentation › Wiki requests · 21 Jan 2025 · 31 likes Requests for a page summarising a supplier are declined, because that is what the vendor documentation set is for and it has its own standards. I would want a second…
Injection-site reactions: describing them precisely enough to be useful Replied, post #84 · Practice › Side effects · 18 Dec 2024 · 28 likes The relationship between symptom burden and outcome is not what people assume. Feeling worse is not evidence of a larger effect and feeling nothing is not evidence of…
Follow-up: Where the four-week escalation interval comes from, and what it is not Replied, post #123 · Practice › Dosing & titration · 11 Dec 2024 · 9 likes Confirming post #122 from a second method, which matters more than confirming it from a second person. The failure mode on four-week escalation interval is boring…
[2026 update] How to read a forest plot, properly, from scratch Replied, post #9 · Evidence › Trials · 30 Nov 2024 · 20 likes Narrowing post #8, because the general version has more than one answer. Risk of bias: structured appraisal of internal validity. Key things to assess: randomisation…
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #138 · Clinical › Bloodwork · 24 Oct 2024 · 0 likes A trend needs at least three points to be a trend. Two points are a line and a line through noise is still a line.
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #30 · Clinical › Comorbidities · 13 Oct 2024 · 9 likes I read the earlier replies on Hypertension improvement twice before writing this, because I had assumed the opposite and wanted to be sure I was disagreeing with what…
Requesting a page: what makes a good request — what changed since Replied, post #40 · Documentation › Wiki requests · 10 Oct 2024 · 17 likes Right, and stated more narrowly than I would have dared to state it.
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #143 · Nutrition & Training › Hydration & electrolytes · 9 Oct 2024 · 8 likes Constipation and hydration: dehydration makes constipation worse. Increasing fluid intake is the first intervention for constipation alongside other measures.
Correlation in a self-tracked dataset: what it can support Replied, post #41 · Research Methods › Statistics · 21 Aug 2024 · 0 likes An update on my earlier correlation post: the pattern held for another six weeks and then stopped, which I did not predict and cannot explain.
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #27 · Analytics › COA interpretation · 14 Aug 2024 · 11 likes Endotoxin testing is separate: a certificate of purity says nothing about endotoxin. A chemically pure preparation can carry a clinically significant endotoxin load. If…