h.eriksen

TL2 Moderator · Osijek

Contributes reviews on supplier material. Based in Osijek.

Joined 15 November 2024 · last posted 10h

76 posts, newest first. Showing up to 150.

What a statistical analysis plan adds that the paper does not Replied, post #3 · Evidence › Trials · 27 Jul 2026 · 0 likes This follows post #2 rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add…
Insurance and replacement policies, compared Replied, post #115 · Sourcing › Logistics · 24 Jul 2026 · 0 likes Import restrictions by jurisdiction: what is legal to import for personal use varies enormously by country. Some jurisdictions are quite permissive; others are not.…
[2026 update] Antibiotics and a course of something with delayed emptying Replied, post #83 · Practice › Interactions · 24 Jul 2026 · 0 likes post #82 answers the question as asked. The question underneath it is different. Thyroid medications: semaglutide is associated with a slowing of gastric emptying,…
Peak-to-trough ratio at steady state for a weekly agent — the long version Replied, post #58 · Pharmacology › Pharmacokinetics · 22 Jul 2026 · 13 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…
A single out-of-range value on an otherwise normal panel Replied, post #74 · Clinical › Bloodwork · 18 Jul 2026 · 8 likes HbA1c and glucose: HbA1c reflects average glucose over months; a spot glucose measurement reflects the moment. Trending glucose downward while HbA1c stays flat is a…
What to bring: records that a clinician can actually use — a second dataset Replied, post #15 · Clinical › Prescriber conversations · 7 Jul 2026 · 19 likes post #14 answers the question as asked. The question underneath it is different. Prescription logistics: confirm whether it will be filled locally, requires mail order,…
An appeal that succeeded, with the letter structure Replied, post #13 · Access › Insurance & coverage · 7 Jul 2026 · 21 likes I read post #11 twice before replying, because I had assumed the opposite. Reimbursement changes: a compound covered one year might not be the next. A formulary…
Pooling trials with different estimands Replied, post #73 · Evidence › Meta-analyses · 5 Jul 2026 · 0 likes On post #69 — agreed on the reasoning, with one qualification. Sensitivity analysis: the authors re-run the meta-analysis excluding studies one at a time, or by…
Carryover and the ghost peak from last week's standard — what changed since Replied, post #110 · Analytics › HPLC & UHPLC · 5 Jul 2026 · 24 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…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #62 · Sourcing › Independent verification · 3 Jul 2026 · 15 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…
Reference intervals: how they are constructed and why one in twenty flags — does this… Replied, post #9 · marked as the solution · Clinical › Bloodwork · 25 Jun 2026 · 7 likes Lipid panel interpretation: total, LDL, HDL, triglycerides all on one panel. Reading them together is more informative than reading one value in isolation. An elevated…
An 18-month record including the parts that went badly Replied, post #37 · Outcomes › Progress reports · 10 Jun 2026 · 0 likes Longitudinal report with the method stated: same scale, same time of day, same conditions. A scale is a tool; use the same one each time. Consistency matters more than…
Micro-titration: a disputed topic, argued properly — one year on Replied, post #47 · Practice › Dosing & titration · 9 Jun 2026 · 9 likes Stepping down deliberately: the withdrawal trials show that stopping is followed by regain. The step-down literature is thinner. The conservative assumption is that…
Tracking a shortage from primary sources rather than rumour Replied, post #28 · Access › Shortages · 30 May 2026 · 0 likes International supply chains: a shortage in one country does not mean shortage in another. That is why ordering from multiple suppliers before a shortage gets bad is…
Revisiting: The arithmetic of an intermediate dose between two label steps Replied, post #36 · Practice › Dosing & titration · 20 May 2026 · 19 likes Splitting a weekly dose in two: the pharmacokinetic argument against is that you want the benefit of long half-life, which gives a slowly changing plasma level from a…
Batch numbers that do not match the vial label Replied, post #18 · Sourcing › Red flags · 19 May 2026 · 4 likes Rapid supplier turnover: a supplier that changes corporate structure, domain name, or contact repeatedly in short time windows raises suspicion about stability and…
0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #40 · Devices › Syringes & needles · 14 May 2026 · 9 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Vomiting: when it is expected and when it is a reason to stop — one year on Replied, post #8 · Practice › Side effects · 12 May 2026 · 1 like This follows post #5 rather than contradicting it. Delayed gastric emptying: the mechanism behind much of the gastrointestinal side-effect profile. At extreme…
A plateau that disappeared when I changed how I measured — the long version Replied, post #34 · Outcomes › Progress reports · 4 May 2026 · 0 likes Measurement noise: day-to-day body mass varies by more than a kilogram on hydration, glycogen, and gut contents alone. A weekly reading is a single noisy sample of a…
Tracking intake honestly when appetite is absent Replied, post #7 · Nutrition & Training › Protein & intake · 24 Apr 2026 · 14 likes Eating anything at all: on substantial appetite suppression, eating enough total calories to maintain lean mass is the priority. Protein comes second to total intake.
Spreadsheets: an appreciation — what changed since Replied, post #19 · Lounge › Off topic · 14 Apr 2026 · 0 likes Picking up post #16: that is the part I would want checked first. Lower-stakes conversation that does not belong in the technical categories. Still civil, still sourced…
Spike-and-recover accuracy for a peptide assay Replied, post #71 · Analytics › Method validation · 9 Apr 2026 · 0 likes Forced degradation studies: deliberately stress the material with acid, base, oxidant, heat, light to generate degradation products and demonstrate that the method can…
Type 2 diabetes and the largest part of the evidence base Replied, post #61 · Clinical › Comorbidities · 9 Apr 2026 · 30 likes Type 2 diabetes: the population with the largest evidence base for these compounds. The SURPASS and SUSTAIN programmes established glycaemic benefit. The renal and…
Run-in periods and the population they select Replied, post #96 · Evidence › Trials · 9 Apr 2026 · 0 likes post #95 answers the question as asked. The question underneath it is different. Confounding in observational data: a third variable can explain an apparent…
Coming back to: Washout: how long is long enough, and for what purpose Replied, post #97 · Pharmacology › Pharmacokinetics · 7 Apr 2026 · 0 likes On post #93 — agreed on the reasoning, with one qualification. Albumin binding: semaglutide binds albumin through a fatty side chain, which sequesters the free form and…
Follow-up: State-level differences that actually matter Replied, post #29 · Regional › North America · 5 Apr 2026 · 19 likes Coming back to post #27, because the follow-up matters more than the original answer. Having read the exchange above, I think I was wrong earlier in this topic and I…
Labelling requirements for research chemicals Replied, post #7 · Sourcing › Regulatory · 2 Apr 2026 · 13 likes Regulatory positions change: a compound's status today might differ from its status a year from now. Citing a regulatory position is worth doing only with a date…
[2026 update] Composite endpoints and the component doing the work Replied, post #33 · Evidence › Trials · 16 Mar 2026 · 0 likes Multiplicity and multiple comparisons: if a trial tests many hypotheses, the chance of a false positive on at least one by random chance increases. This is why…
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #14 · Evidence › Journal club · 11 Mar 2026 · 31 likes Coming back to post #12, because the follow-up matters more than the original answer. PIONEER 6 (N Engl J Med 2019): Cardiovascular safety trial for oral semaglutide,…
[2026 update] Publication patterns in the BPC-157 literature, examined Replied, post #14 · Compounds › Repair & healing peptides · 4 Mar 2026 · 7 likes Coming back to post #12, because the follow-up matters more than the original answer. Why plausible mechanism is not evidence of effect: a mechanism that is chemically…
[2026 update] Thyroid function tests during substantial weight change Replied, post #8 · Clinical › Bloodwork · 4 Mar 2026 · 31 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…
The lowest dose that does anything: is that a real question? Replied, post #22 · Practice › Dosing & titration · 2 Mar 2026 · 0 likes Worth separating two things that post #18 runs together. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather…
Measurement error in a self-reported exposure Replied, post #43 · Evidence › Study critique · 24 Feb 2026 · 12 likes This follows post #40 rather than contradicting it. Multiple comparisons: if a paper reports many outcomes, the chance of a spurious association by random chance is…
Follow-up: Search filters: what is missing Replied, post #39 · Meta › Site feedback · 23 Feb 2026 · 5 likes Bugs and friction: the parts of the site that do not work the way you expected. Report them specifically (what you did, what you expected, what happened instead) so…
Revisiting: Language barriers in accessing a prescription abroad Replied, post #76 · Access › International · 27 Jan 2026 · 9 likes post #75 answers the question as asked. The question underneath it is different. Insurance and coverage: coverage decisions are national. A compound approved in one…
Coming back to: Training through a dose escalation week Replied, post #15 · Nutrition & Training › Resistance training · 25 Jan 2026 · 1 like Intensity: using weights that allow 6 to 12 reps before fatigue is a reasonable range for preserving muscle. Heavier weights with lower reps can work but require more…
Muscle cramps: the ordinary causes before the exotic ones Replied, post #70 · Practice › Side effects · 19 Jan 2026 · 20 likes Injection site reaction: local erythema, nodules, or induration at injection sites is reported by some people. Site rotation, avoiding reinjection into the same area…
Charge states for a 4 kDa peptide, worked through — the long version Started this topic · Analytics › Mass spectrometry · 16 Jan 2026 · 4 likes Charge states for a 4 kDa peptide, worked through — the long version Writing it up because I had to work it out twice and would rather nobody else did. Working through…
Coming back to: A community side-effect dataset, with its response rate and biases Replied, post #9 · Data & Tools › Datasets · 28 Dec 2025 · 10 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…
Non-inferiority margins: how they are chosen and how they are abused Replied, post #21 · Evidence › Trials · 5 Dec 2025 · 18 likes This follows post #18 rather than contradicting it. Open-label design: unblinded trials admit expectation effects. For weight-loss trials where one arm loses…
Follow-up: Constipation management, with a dietitian's contribution Replied, post #25 · Practice › Side effects · 14 Nov 2025 · 5 likes Timeline matters: onset, duration, pattern over days or weeks, relationship to injection and to meals all provide information that "I have nausea" does not. Posting…
Which panel is worth repeating and which is worth ignoring — a second dataset Replied, post #10 · Clinical › Bloodwork · 13 Nov 2025 · 8 likes Biological variation: the person-to-person variation in a biomarker for a healthy person is larger than most people realize. Comparing your result to the reference…
Bleeding at the injection site: normal, and what to do about it Replied, post #3 · marked as the solution · Practice › Administration · 2 Nov 2025 · 7 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…
Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one Replied, post #21 · Compounds › Oral incretins · 28 Oct 2025 · 10 likes On post #17 — agreed on the reasoning, with one qualification. Fasting instructions are not optional advice. Taking the tablet with food or with more than a sip of…
Request: a diff view for wiki revisions — the long version Replied, post #41 · Meta › Feature requests · 10 Sep 2025 · 9 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.
Liver enzymes drifting down and what that usually means Replied, post #10 · Clinical › Bloodwork · 9 Sep 2025 · 10 likes A single value outside interval: usually uninformative on a single draw. What makes a result interesting: a trend across multiple draws, a magnitude well beyond the…
When a preprint is the best available evidence and we say so Replied, post #126 · Evidence › Preprints · 1 Sep 2025 · 2 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.
Second pass at: Why this subcategory is stricter about sourcing than most Replied, post #115 · Compounds › Secretagogues & GH axis · 30 Aug 2025 · 4 likes Worth separating two things that post #111 runs together. Tesamorelin has an approved indication in HIV-associated lipodystrophy. That is the only compound in this…
Substitution between formats during a shortage Replied, post #37 · Access › Shortages · 11 Aug 2025 · 11 likes On post #33 — agreed on the reasoning, with one qualification. Compounding during shortages: some jurisdictions allow pharmacy compounding when a marketed product is in…
High-resolution MS on aggregates and what it can see Replied, post #41 · Analytics › Mass spectrometry · 10 Aug 2025 · 15 likes What mass accuracy establishes: the measured mass is consistent with a specific composition. What it does not establish: purity, sequence order, stereochemistry, or the…
Antibiotics and a course of something with delayed emptying Replied, post #106 · Practice › Interactions · 1 Aug 2025 · 0 likes I read post #104 twice before replying, because I had assumed the opposite. Sulfonylureas and meglitinides: these agents stimulate insulin release and carry…
Criticising the method without criticising the authors — one year on Replied, post #13 · Evidence › Study critique · 24 Jul 2025 · 10 likes What makes a methodological criticism substantive: it identifies a specific feature of the design that materially affects what the paper can conclude. "Small sample…
Managing an unplanned gap in supply — what changed since Replied, post #22 · Access › Shortages · 22 Jul 2025 · 3 likes Worth separating two things that post #18 runs together. Shortage predictions: regulators and suppliers issue shortage alerts before they become acute. Checking the…
Journal club: indirect comparison between two programmes, defended and attacked — one… Replied, post #19 · Evidence › Journal club · 6 Jul 2025 · 21 likes I read post #17 twice before replying, because I had assumed the opposite. Critical appraisal template: (1) What did the trial set out to estimate? (2) Could the design…
Reporting a disappointing outcome, and why it belongs here Replied, post #19 · Outcomes › Progress reports · 3 Jul 2025 · 33 likes Non-scale victories: muscle gain or maintenance, clothing fit, energy level, and capability (like climbing stairs without breathlessness) are measurements that…
Micronutrient status when intake falls substantially Replied, post #14 · Clinical › Bloodwork · 1 Jul 2025 · 7 likes Picking up post #11: that is the part I would want checked first. I disagree with the reply above, and I think the disagreement is substantive rather than…
Specification in the result column: why that is a meaningful error Replied, post #13 · Analytics › COA interpretation · 28 Jun 2025 · 1 like A certificate of analysis is a statement by its issuer that a defined test was performed on a defined lot and produced a defined result. That is all it is, and it is…
Semaglutide versus liraglutide head to head: reading STEP 8 carefully Replied, post #9 · Compounds › Semaglutide · 1 Jun 2025 · 23 likes The SELECT trial changed the positioning because it was the first cardiovascular outcome trial in people without diabetes. That decoupled the cardiovascular argument…
Coming back to: What published stability data actually covers, and what it does not Replied, post #35 · Practice › Storage & stability · 6 May 2025 · 0 likes post #34 is right about the mechanism and I think understates the practical bit. Temperature excursions: if a vial sat at room temperature for a time, the question is…
Certificates issued by the seller versus by a laboratory Replied, post #63 · Analytics › COA interpretation · 26 Apr 2025 · 4 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…
Second pass at: Journal club: STEP 4 and what a withdrawal design can prove Replied, post #8 · Evidence › Journal club · 8 Apr 2025 · 0 likes SURMOUNT-1 (N Engl J Med 2022): Tirzepatide obesity trial. The largest mean weight reduction for a pharmacological intervention at publication. Read the categorical…
A ten-fold dose error caught before injection Replied, post #14 · Devices › Syringes & needles · 28 Mar 2025 · 5 likes Worth separating two things that post #10 runs together. Fixed versus detachable needles: insulin syringes usually have fixed needles (no dead volume loss to the hub).…
A promotion I argued against, and why I lost Replied, post #121 · Documentation › Doc review · 5 Mar 2025 · 2 likes I read post #119 twice before replying, because I had assumed the opposite. Review date disputes: if a maintained page's review date is approaching and it has not been…
Pancreatitis history and the risk calculus — a second dataset Replied, post #25 · Safety › Contraindications · 27 Feb 2025 · 0 likes Severe hepatic impairment: less is known than for kidney disease. Extreme caution or contraindication depending on the specific degree of impairment.
Identical chromatograms across two different lots Replied, post #88 · Sourcing › Red flags · 8 Feb 2025 · 0 likes post #87 is right about the mechanism and I think understates the practical bit. Unresponsiveness: a supplier that does not reply to reasonable requests for…
Escalating every six weeks instead of four: what I observed over eight months Replied, post #4 · Practice › Dosing & titration · 1 Jan 2025 · 5 likes Micro-titration: the concept of increments smaller than the labelled steps. It has no evidence base from trials but is described by some people. The downside is that…
Fixed versus detachable needles: the trade-offs Replied, post #76 · Devices › Syringes & needles · 28 Dec 2024 · 4 likes post #75 is right about the mechanism and I think understates the practical bit. Needle gauge: smaller numbers (30G) are finer and less painful. Larger numbers (25G)…
Washout with a one-week half-life: the arithmetic Replied, post #68 · Research Methods › N-of-1 designs · 5 Dec 2024 · 1 like Stopping rules: decide in advance when you will stop measuring (after a defined duration, after a defined number of measurements, or after a defined condition is met).…
Second pass at: Food noise reducing and the disorientation that can follow Replied, post #57 · Wellbeing › Mental health · 29 Oct 2024 · 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.
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #47 · Clinical › Comorbidities · 17 Oct 2024 · 24 likes PCOS and metabolic overlap: polycystic ovary syndrome has metabolic overlap with obesity and insulin resistance. Data on compounds in this class in PCOS specifically is…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #63 · Nutrition & Training › Hydration & electrolytes · 28 Aug 2024 · 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…
What a stability-indicating method is and how you demonstrate one — one year on Replied, post #2 · Analytics › Method validation · 12 Jul 2024 · 1 like 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…
Journal club: FLOW and the renal composite, component by component Replied, post #4 · Evidence › Journal club · 7 Jul 2024 · 21 likes STEP 1 (N Engl J Med 2021): The pivotal obesity trial for semaglutide and the reference point for most subsequent comparison. Mean weight reduction was substantially…
Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Replied, post #27 · Practice › Dosing & titration · 7 Jul 2024 · 26 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…
The mass-error checker and its intended scope Replied, post #85 · Data & Tools › Calculators · 29 Jun 2024 · 0 likes Units: all calculators explicitly require units to be stated. This prevents the decimal-point errors that come from forgetting units. Always verify units in and out.
Assessing a warm arrival: the decision process — one year on Replied, post #6 · Sourcing › Logistics · 28 May 2024 · 6 likes post #5 answers the question as asked. The question underneath it is different. Thank you for the correction. I have edited my earlier post with a note rather than…