k.agyeman

TL2 Moderator · 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 For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Follow-up: Reading an interaction checker output critically Replied, post #62 · Practice › Interactions · 23 Jul 2026 · 25 likes Thyroid medications: semaglutide is associated with a slowing of gastric emptying, which might affect thyroid medication absorption if they are taken very close…
Journal club: what we got wrong in an earlier session Replied, post #100 · Evidence › Journal club · 19 Jul 2026 · 0 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
What consumer-accessible tests can and cannot determine — a second dataset Replied, post #99 · Analytics › Home & field testing · 18 Jul 2026 · 14 likes Colorimetric tests: colour intensity correlates with concentration, but the relationship is non-linear at extremes and the correlation depends on the exact conditions…
A revision dispute resolved on the topic rather than in the history Replied, post #14 · Meta › Wiki maintenance · 17 Jul 2026 · 17 likes Redundancy: if two maintained pages cover largely the same ground, consolidation might improve clarity. Pointing out redundancy helps maintainers see the issue.
Coming back to: Delayed gastric emptying and oral medication absorption: which drugs… Replied, post #4 · Practice › Interactions · 7 Jul 2026 · 6 likes Supplements and herbs: many have no established interaction. Some do. If you are taking something unusual, checking a reference (like a pharmacist) is more useful than…
An 18-month record including the parts that went badly Replied, post #60 · Outcomes › Progress reports · 5 Jul 2026 · 7 likes I read post #58 twice before replying, because I had assumed the opposite. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write…
Coming back to: Solubility limits and what a cloudy solution is telling you Replied, post #36 · Pharmacology › Formulation chemistry · 1 Jul 2026 · 0 likes Picking up post #33: that is the part I would want checked first. Lyophilisation and reconstitution: the powder is stable for extended periods if kept cool and dry.…
Naming conventions for research peptides and the confusion they cause Replied, post #22 · Compounds › Other compounds · 28 Jun 2026 · 0 likes Reading a supplier's product description as a marketing document: that is exactly what it is. The hyperbole, the mechanism written as fact, the theoretical benefits…
Revisiting: The best-written scientific paper you have read Replied, post #32 · Lounge › Off topic · 14 Jun 2026 · 8 likes post #31 answers the question as asked. The question underneath it is different. Industry and supply chain: post about manufacturing, pharmaceutical economics, or…
Documenting a supplier's response to a discrepancy Replied, post #14 · Sourcing › Vendor reports · 13 Jun 2026 · 0 likes Pattern across lots: a single result is a data point. Three or four results from the same supplier showing a consistent pattern becomes a record worth discussing. Two…
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #58 · Compounds › Semaglutide · 10 Jun 2026 · 5 likes Albumin binding is not a unique structural feature and nothing in the class lacks it, but the reversibility matters. Semaglutide binds albumin covalently through a…
Gastro-oesophageal reflux: improving or worsening? Replied, post #53 · Clinical › Comorbidities · 7 Jun 2026 · 15 likes Cardiovascular disease: several compounds have cardiovascular outcome trials. SELECT was in people without diabetes; SUSTAIN 6 was in high-risk diabetes. Absolute…
Why the titration planner refuses to produce a schedule below a floor Replied, post #83 · Data & Tools › Calculators · 6 Jun 2026 · 17 likes post #82 is right about the mechanism and I think understates the practical bit. Thank you for the correction. I have edited my earlier post with a note rather than…
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 post #72 is right about the mechanism and I think understates the practical bit. Evasion when asked: if a supplier does not clarify when asked specifically for method…
When your prescriber and the evidence disagree Replied, post #14 · Clinical › Prescriber conversations · 5 Jun 2026 · 0 likes post #13 answers the question as asked. The question underneath it is different. What to bring: copies of relevant lab results, pharmacy records (to confirm doses…
Documenting a payment dispute without naming and shaming Replied, post #10 · Sourcing › Payments · 4 Jun 2026 · 0 likes This follows post #7 rather than contradicting it. Documentation and tax implications: payments you make for compounds might have implications for tax reporting…
Follow-up: A parcel that arrived warm: a decision process, not a verdict Replied, post #17 · Practice › Storage & stability · 6 May 2026 · 6 likes Worth separating two things that post #13 runs together. Beyond-use dating: the date after which a prepared solution should not be used. It is an estimate based on how…
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 Truncation products: fragments from incomplete synthesis or from degradation. They elute quite differently from the intact peptide because they are much smaller and…
Converting between mg/mL and units per dose, both directions — the long version Replied, post #101 · Practice › Reconstitution · 24 Apr 2026 · 1 like Reconstituting a multi-strength kit: if a kit contains 5 mg, 10 mg, 15 mg vials and you are reconstituting all of them, writing the concentration on each vial in…
Grapefruit: why this class is not the class that cares Replied, post #138 · Practice › Interactions · 9 Apr 2026 · 0 likes Sulfonylureas and meglitinides: these agents stimulate insulin release and carry hypoglycemia risk. Combining them with semaglutide or tirzepatide requires dose…
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #33 · Evidence › Journal club · 7 Apr 2026 · 7 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Bug report: the reconstitution calculator and a rounding edge case Replied, post #24 · Data & Tools › Calculators · 4 Apr 2026 · 6 likes post #23 answers the question as asked. The question underneath it is different. Why calculators are not medical advice: they do arithmetic. Medical decisions are not…
Second pass at: Choosing a concentration on purpose rather than by accident Replied, post #54 · Practice › Reconstitution · 24 Mar 2026 · 1 like The decimal-point error: computing 5 mg / 2 mL as 0.25 mg/mL instead of 2.5 mg/mL is the most common arithmetic error in this subcategory. The habit that catches it:…
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 as a filter: published papers have survived a review process that rejects many submissions. Preprints have not. Neither guarantees correctness, but…
Introducing myself: pharmacist, sceptic, reluctant participant — one year on Replied, post #104 · Lounge › Introductions · 18 Mar 2026 · 31 likes Ongoing: you can post multiple introductions over time. If you return after a long break, reintroducing yourself is fine.
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #10 · Evidence › Journal club · 16 Mar 2026 · 0 likes post #9 is right about the mechanism and I think understates the practical bit. For anyone arriving from a search: the marked solution above is the direct answer, and…
A fridge failure and how I assessed the contents afterwards Replied, post #4 · Devices › Cold chain · 12 Mar 2026 · 0 likes Picking up the opening post: that is the part I would want checked first. Shipping container and cold packs: reputable suppliers use insulated containers with cold…
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 Tandem mass spectrometry: MS/MS fragments the molecular ion and uses fragment masses to confirm identity and detect modifications. A simple identity confirmation by…
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 Picking up post #43: that is the part I would want checked first. Off-topic posts that do not belong here belong in the Lounge instead. You are not in trouble if a…
Dead volume across syringe and needle combinations Replied, post #72 · Devices › Syringes & needles · 15 Feb 2026 · 0 likes Picking up post #69: that is the part I would want checked first. Syringe barrel size: common sizes are 0.3 mL, 0.5 mL, and 1.0 mL. Smaller barrels are more legible for…
Follow-up: Bug report: the reconstitution calculator and a rounding edge case Replied, post #44 · Data & Tools › Calculators · 11 Feb 2026 · 17 likes Reporting bugs: if you notice a calculator giving wrong results, report it in this subcategory. Bugs are fixed when identified.
Adolescents: a distinct evidence base — one year on Replied, post #61 · Clinical › Special populations · 4 Feb 2026 · 8 likes Picking up post #58: that is the part I would want checked first. Gastroparesis: pre-existing severe delayed gastric emptying can worsen with compounds that slow it…
Validating a calculator against hand arithmetic Replied, post #4 · Data & Tools › Calculators · 2 Feb 2026 · 11 likes Dose equivalence calculator: compounds have different potencies. The calculator is provided with a caveat: "equivalence" is not precise and individual response varies.…
Revisiting: Absolute versus relative contraindications Replied, post #9 · Safety › Contraindications · 16 Jan 2026 · 2 likes Concurrent insulin or sulfonylureas: not an absolute contraindication but requires dose adjustment and close monitoring for hypoglycemia. The combination is used with…
The headache that turns out to be dehydration Replied, post #102 · Nutrition & Training › Hydration & electrolytes · 20 Dec 2025 · 8 likes Water intoxication: drinking excessive water (more than a few liters per day for extended time) without electrolyte replacement can cause hyponatremia. This is rare but…
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 Dose escalation in the published trials: the protocols started at lower doses and escalated by defined steps. The step sizes are documented and they may or may not…
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 Identity and self-image: for some people, weight and body size are central to identity. Large change to body size can affect identity. This is not pathological; it is…
Prescription requirements and telehealth models Replied, post #42 · Sourcing › Regulatory · 1 Dec 2025 · 2 likes This follows post #39 rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add…
Thyroid function tests during substantial weight change Replied, post #140 · Clinical › Bloodwork · 19 Nov 2025 · 29 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #50 · Compounds › Semaglutide · 19 Nov 2025 · 26 likes The STEP programme populations were selected: enrollment criteria required baseline body mass index over 30, no recent blood pressure crisis, no recent retinopathy, no…
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 question about technique rather than…
Revisiting: GLP-1 receptor distribution: central and peripheral Replied, post #48 · Pharmacology › Receptor biology · 5 Oct 2025 · 0 likes This follows post #45 rather than contradicting it. Pharmacological class effects: all GLP-1 agonists slow gastric emptying and suppress appetite. Those are class…
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. I have read the maintained page on this and I…
Research-use-only labelling: what it means and what it does not Replied, post #39 · Sourcing › Regulatory · 28 Sep 2025 · 0 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
Which panel is worth repeating and which is worth ignoring Replied, post #119 · Clinical › Bloodwork · 24 Sep 2025 · 2 likes Fasting state: some lab tests require fasting; others do not. Lipids on a fasting draw differ from lipids on a fed draw. Always note whether the test was fasting when…
Payment method and the leverage it gives you, ranked Replied, post #48 · Sourcing › Payments · 21 Sep 2025 · 11 likes Chargeback reality: if you pay by credit card and the supplier does not deliver, you can attempt a chargeback. Suppliers know this and many require non-chargeable…
Second pass at: Programming during a large energy deficit Replied, post #2 · Nutrition & Training › Resistance training · 6 Sep 2025 · 1 like Coming back to the opening post, because the follow-up matters more than the original answer. Deload weeks: periodic weeks (every 4 to 8 weeks) with reduced volume and…
Tirzepatide molecular mass and the charge states you would expect on ESI Replied, post #20 · Compounds › Tirzepatide · 27 Aug 2025 · 9 likes On post #16 — agreed on the reasoning, with one qualification. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly…
Interpreting a composition change that is within the error bars Replied, post #22 · Outcomes › Body composition · 27 Jul 2025 · 0 likes On post #18 — agreed on the reasoning, with one qualification. Visceral fat: DXA does not distinguish visceral (organ-associated) fat from subcutaneous fat. That…
Asking about a compound your prescriber has not heard of Replied, post #107 · Clinical › Prescriber conversations · 27 Jul 2025 · 26 likes Questions about dose: asking "how will we determine whether this dose is working for me" gets at the monitoring plan. Asking "can we start lower" or "can we escalate…
An emergency department visit, described afterwards Replied, post #45 · Safety › Adverse events · 23 Jul 2025 · 11 likes Coming back to post #43, because the follow-up matters more than the original answer. Two things before anyone answers the substance. First, the context in the first…
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 Is there a ceiling dose beyond which the effect plateaus? The trials did not study that because they stopped at 2.4 mg. Some people report trying higher doses, but…
Comparing my trajectory with the trial curves, carefully Replied, post #23 · Outcomes › Progress reports · 11 Jul 2025 · 15 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Repeatability versus intermediate precision Replied, post #106 · Analytics › Method validation · 30 Jun 2025 · 0 likes Robustness: the method gives consistent results when minor parameters vary. Tested by deliberately varying pH, temperature, flow rate, and mobile phase composition…
Coming back to: Why quantitation is the hard part, not detection Replied, post #32 · Analytics › Home & field testing · 29 Jun 2025 · 10 likes post #31 answers the question as asked. The question underneath it is different. Precision of home tests: most consumer-accessible devices are not precise to the level…
[2026 update] An appeal that failed, and what I would do differently Replied, post #69 · Access › Insurance & coverage · 11 Jun 2025 · 12 likes This follows post #66 rather than contradicting it. Documentation your clinician can provide: letters from clinicians describing why standard treatments have failed or…
Pre-registering a personal experiment, seriously Replied, post #95 · Research Methods › N-of-1 designs · 2 Jun 2025 · 32 likes When to run an n-of-1: this design works when you want to know whether a treatment works for you, not whether it works in general. For that purpose, it is efficient.
Half-life, steady state, and accumulation worked through Replied, post #52 · Pharmacology › Pharmacokinetics · 1 Jun 2025 · 26 likes Hepatic metabolism: the degree to which each compound is hepatically metabolised versus renally cleared is known but varies. Severe liver disease changes clearance.
Holding a dose indefinitely: is there a documented downside? Replied, post #23 · Practice › Dosing & titration · 27 May 2025 · 32 likes How the published trials escalated: they used specific step sizes and intervals. The STEP programme used a particular cadence; the SURPASS and SURMOUNT programmes used…
Follow-up: What other technical communities get right that we do not Replied, post #79 · Lounge › Off topic · 26 Apr 2025 · 25 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Why cagrilintide alone is discussed so much less than in combination Replied, post #88 · Compounds › Cagrilintide & amylin analogues · 2 Apr 2025 · 7 likes Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the…
Documenting a supplier's response to a discrepancy — does this still hold? Replied, post #44 · Sourcing › Vendor reports · 1 Apr 2025 · 0 likes post #43 answers the question as asked. The question underneath it is different. Structured report format: compound, lot, independent testing service, method as…
Why cagrilintide alone is discussed so much less than in combination Replied, post #63 · Compounds › Cagrilintide & amylin analogues · 30 Mar 2025 · 14 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…
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 Worth separating two things that post #31 runs together. How much of the diluent volume the powder itself displaces: for a small peptide vial, the powder volume is…
Counter-ion form: the field almost nobody reports — one year on Replied, post #91 · Analytics › COA interpretation · 17 Mar 2025 · 1 like On post #87 — agreed on the reasoning, with one qualification. Amino acid analysis gives content: it hydrolyses the peptide and quantifies the residues. It measures the…
Preservatives: function, testing, and limits Replied, post #20 · Pharmacology › Formulation chemistry · 14 Mar 2025 · 0 likes Excipients and their purposes: mannitol, sucrose, or other sugars in lyophilised formulations protect the peptide during drying and storage. They are not impurities;…
Counter-ion form: the field almost nobody reports — one year on Replied, post #72 · Analytics › COA interpretation · 11 Mar 2025 · 12 likes This follows post #69 rather than contradicting it. Sterility testing is separate: chromatographic purity, mass spectrometry, and endotoxin testing all say nothing…
Deamidation and the close-eluting pair it produces Replied, post #5 · Analytics › Impurities & related substances · 5 Mar 2025 · 10 likes On the opening post — agreed on the reasoning, with one qualification. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down…
Validating a method you did not develop — does this still hold? Replied, post #59 · Analytics › Method validation · 1 Mar 2025 · 23 likes post #58 is right about the mechanism and I think understates the practical bit. Why two laboratories may disagree: after validating the same method, they may still…
What SELECT changed about how semaglutide is discussed, and what it did not Replied, post #23 · Compounds › Semaglutide · 27 Feb 2025 · 0 likes This follows post #20 rather than contradicting it. The 165 to 184 hour range: that is roughly 7 to 7.6 days, which is why the weekly schedule works. Below 4 half-lives…
Canadian access and provincial variation Replied, post #58 · Regional › North America · 5 Feb 2025 · 11 likes post #57 answers the question as asked. The question underneath it is different. For anyone arriving from a search: the marked solution above is the direct answer, and…
A page that has drifted out of date and needs a maintainer Replied, post #54 · Documentation › Wiki requests · 21 Jan 2025 · 31 likes Flag a page that has drifted: if you notice a maintained page has information that is outdated (dates that have passed, regulatory changes, new evidence) post a flag so…
Injection-site reactions: describing them precisely enough to be useful Replied, post #84 · Practice › Side effects · 18 Dec 2024 · 28 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
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 post #122 answers the question as asked. The question underneath it is different. Steady state means the plasma concentration is stable from dose to dose. That happens…
[2026 update] How to read a forest plot, properly, from scratch Replied, post #9 · Evidence › Trials · 30 Nov 2024 · 20 likes post #8 answers the question as asked. The question underneath it is different. The estimand: what the trial set out to estimate. Two trials can be identical in…
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #138 · Clinical › Bloodwork · 24 Oct 2024 · 0 likes Reference intervals: constructed to contain the central 95% of a reference population, which means one in twenty healthy people falls outside one by definition. Add…
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #30 · Clinical › Comorbidities · 13 Oct 2024 · 9 likes Chronic kidney disease: compounds in this class have renal benefit in people with kidney disease. The benefit appears to be additive to other renal-protective agents,…
Requesting a page: what makes a good request — what changed since Replied, post #40 · Documentation › Wiki requests · 10 Oct 2024 · 17 likes post #39 is right about the mechanism and I think understates the practical bit. Format suggestions: if you think a maintained page could be clearer in its presentation…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #143 · Nutrition & Training › Hydration & electrolytes · 9 Oct 2024 · 8 likes Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the…
Correlation in a self-tracked dataset: what it can support Replied, post #41 · Research Methods › Statistics · 21 Aug 2024 · 0 likes Regression to the mean: if you select people with extreme values (very high or very low), their next measurement is often less extreme just by chance. This can look…
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #27 · Analytics › COA interpretation · 14 Aug 2024 · 11 likes Sterility testing is separate: chromatographic purity, mass spectrometry, and endotoxin testing all say nothing about whether a solution is sterile. If sterility…