PSundberg

TL2 Member · Jönköping, SE

Practical questions, practical answers. Not interested in speculation without a source.

Joined 31 July 2025 · last posted 6d

80 posts, newest first. Showing up to 150.

Insomnia at a dose step: reported experiences — the long version Replied, post #50 · Wellbeing › Sleep · 22 Jul 2026 · 0 likes Insomnia sits at the boundary between what this community can usefully discuss and what it cannot, and I think it falls on the discussable side, narrowly.
What a regulator's shortage notice actually authorises Replied, post #10 · Sourcing › Regulatory · 20 Jul 2026 · 1 like A regulator's public assessment report is usually the single best free source on a compound's evidence base, and it is almost never cited here. The step people skip is…
Which categories are strict and which are relaxed, honestly Replied, post #31 · Start Here › Welcome · 20 Jul 2026 · 0 likes That is a fair summary of where the discussion has got to.
[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #25 · Analytics › HPLC & UHPLC · 10 Jul 2026 · 0 likes Detection wavelength looks different depending on whether you are reading the primary literature or the summaries of it, and the difference is not in our favour.
When a dose reduction is the correct response to a side effect Replied, post #37 · Practice › Dosing & titration · 9 Jul 2026 · 2 likes Worth separating two things that post #35 runs together. The arithmetic of an intermediate dose: if the label says 1.0 mg and 2.0 mg, a dose strictly between them is…
GHRH analogues versus ghrelin mimetics: different mechanisms, conflated discussion Replied, post #37 · Compounds › Secretagogues & GH axis · 5 Jul 2026 · 17 likes Sermorelin and the growth hormone releasing hormone analogues depend on a functioning pituitary response, which is the mechanistic reason they behave differently in…
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #10 · Evidence › Journal club · 30 Jun 2026 · 0 likes Saving this. It is the version I will quote when the question comes round again.
Carryover and the ghost peak from last week's standard — what changed since Replied, post #82 · Analytics › HPLC & UHPLC · 28 Jun 2026 · 11 likes A relative retention time against a known peak travels much better than an absolute one, and almost nobody reports it. Marking that as an opinion rather than a finding.
Second pass at: Absence of evidence and evidence of absence Replied, post #29 · Research Methods › Statistics · 24 Jun 2026 · 0 likes Confirming post #28 from a second method, which matters more than confirming it from a second person. Time-to-event analysis handles differing follow-up in a way a…
Carryover and the ghost peak from last week's standard — what changed since Replied, post #61 · Analytics › HPLC & UHPLC · 22 Jun 2026 · 0 likes This settles it for me, at least until somebody posts a reason it should not.
[2026 update] A vial that will not fully dissolve: what to check and in what order Replied, post #117 · Practice › Reconstitution · 19 Jun 2026 · 2 likes This follows post #116 rather than contradicting it. Preservative effectiveness is tested against a defined microbial challenge under defined conditions. It is not a…
Pancreatitis history and the risk calculus Replied, post #20 · Safety › Contraindications · 18 Jun 2026 · 0 likes Agreed on pancreatitis history, with one qualification that I think matters. The reasoning holds for the case as described. Change the starting assumption and it does…
Official shortage notices and what they authorise Replied, post #105 · Access › Shortages · 14 Jun 2026 · 4 likes Manufacturer allocation decisions during a shortage are commercial and are rarely explained, which is frustrating and is not evidence of anything. Not the whole…
Injection volume, overload, and peak distortion Replied, post #46 · Analytics › HPLC & UHPLC · 11 Jun 2026 · 19 likes Method validation is the demonstration that a method can separate the compound from its degradation products and impurities reliably. A method that cannot resolve an…
The anatomy of a question that gets answered within an hour Replied, post #74 · Start Here › How to Ask · 11 Jun 2026 · 26 likes Nobody minds being asked to explain a term. The people who use them most are the quickest to define them, and a question that stops to ask is usually a question that…
Does dual agonism explain the effect size, or is it dose? Replied, post #17 · Compounds › Tirzepatide · 5 Jun 2026 · 7 likes Building on post #14 rather than restating it. The 2.5 mg starting dose is not a therapeutic dose in the sense that weight loss is minimal at that dose. It is a…
Revisiting: Liver enzymes drifting down and what that usually means Replied, post #39 · Clinical › Bloodwork · 1 Jun 2026 · 0 likes Where I part company with post #37, and it is a narrow parting. Liver enzyme changes during rapid weight loss are commonly reported and have several possible…
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #70 · Evidence › Journal club · 29 May 2026 · 26 likes Acknowledging rather than arguing. The reasoning holds as far as I can follow it.
Pinch or no pinch, and how needle length changes the answer — what changed since Replied, post #28 · Practice › Administration · 16 May 2026 · 7 likes Quietly grateful for the plain phrasing. Not every thread gets that.
Anaesthesia and elective surgery: the aspiration question Replied, post #114 · Practice › Interactions · 6 May 2026 · 5 likes Anaesthesia and elective surgery is worth one more sentence than it usually gets, and the sentence is the one about how the number was arrived at.
Follow-up: Tirzepatide and nausea: is the profile genuinely different or just… Replied, post #18 · Compounds › Tirzepatide · 3 May 2026 · 0 likes Checked the Tirzepatide and nausea claim against the primary source this morning. It survives, with a narrower scope than the version quoted here. Posting the narrower…
Coming back to: Measurement error in a self-reported exposure Replied, post #23 · Evidence › Study critique · 27 Apr 2026 · 7 likes I had written a reply contradicting post #19 and deleted it. Here is what survived. What would change my mind on Measurement error is a second dataset collected by…
Follow-up: Tirzepatide and nausea: is the profile genuinely different or just… Replied, post #5 · Compounds › Tirzepatide · 27 Apr 2026 · 11 likes Same experience here, different supplier, so it is at least not unique to one of them.
Transporting a vial for a weekend away — a second dataset Replied, post #33 · Practice › Storage & stability · 21 Apr 2026 · 32 likes This follows post #32 rather than contradicting it. Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or…
PCOS and metabolic overlap: what is and is not studied Replied, post #2 · Clinical › Comorbidities · 19 Apr 2026 · 0 likes Reading back through the PCOS and metabolic overlap threads from last year, the same three questions come up every time and only one of them has ever been answered…
Preprint servers and what screening they do Replied, post #96 · Evidence › Preprints · 20 Mar 2026 · 0 likes Everything in post #95 holds. The case it does not cover is the one I have. Say it is a preprint in the first line rather than the last. Everything downstream depends…
Follow-up: Levothyroxine timing: a real interaction with a simple fix Replied, post #2 · Practice › Interactions · 17 Mar 2026 · 10 likes Anyone asking an interaction question should list everything, including the things they consider irrelevant. The irrelevant one is the answer more often than chance…
Which fields on a certificate actually matter, ranked Replied, post #18 · Analytics › COA interpretation · 16 Mar 2026 · 8 likes The distinction between release testing and characterisation is one industrial documents make and retail ones usually do not. It is the difference between "we tested…
An ABAB design with a data table and honest limitations — a second dataset Replied, post #32 · Research Methods › N-of-1 designs · 4 Mar 2026 · 3 likes Measure the same thing the same way at the same time of day. Most of the noise in personal data is measurement protocol rather than biology. That is the practical…
Completing a dose with a second syringe, and the dead-volume arithmetic Replied, post #11 · Practice › Administration · 3 Mar 2026 · 17 likes Post #9 put the caveat in the right place and I want to underline it. What I would want before treating completing a dose as settled: the method, the sample, and…
Open-label extensions: what survives and what does not Started this topic · Evidence › Trials · 24 Feb 2026 · 53 likes Posting this under the heading it deserves: Open-label extensions: what survives and what does not Everything below is what sits behind that. I have spent a fortnight…
Completing a dose with a second syringe, and the dead-volume arithmetic Replied, post #8 · Practice › Administration · 22 Feb 2026 · 11 likes Post #6 put the caveat in the right place and I want to underline it. Something worth flagging about completing a dose: the strongest-sounding claims in this thread are…
Common supplements people ask about, assessed one at a time — a second dataset Replied, post #55 · Practice › Interactions · 20 Feb 2026 · 2 likes Answering the question post #53 raises rather than the one it answers. Careful with the language on Common supplements. "Not detected" and "not present" are different…
Seven-day rolling means and why weekly readings mislead — one year on Replied, post #48 · Outcomes › Progress reports · 13 Feb 2026 · 1 like Seasonal patterns: some people report weight loss is slower in winter than summer. Body composition and activity changes might contribute. Noting the season is useful…
A history of disordered eating: proceeding carefully Replied, post #69 · Wellbeing › Mental health · 21 Jan 2026 · 11 likes Filing a mild objection to the consensus on history of disordered eating. Mild because I might be wrong; an objection because nobody has addressed the case that does…
Non-inferiority margins: how they are chosen and how they are abused — a second dataset Replied, post #5 · Evidence › Trials · 9 Jan 2026 · 0 likes I read post #3 twice before replying, because I had assumed the opposite. The confident answers on Non-inferiority margins and the well-sourced answers are not the same…
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #57 · Access › Pricing · 9 Jan 2026 · 17 likes Post #54 is the version of this I will quote in future. One addition. Where I would push back on the Price changes consensus is the confidence, not the direction. The…
Pharmacy supply in the UK and the questions you will be asked Replied, post #5 · Regional › UK & Ireland · 7 Jan 2026 · 0 likes On pharmacy supply, the part that usually goes wrong is that the question is asked as though it has one answer. It has a range, and the width of the range is the…
Vomiting: when it is expected and when it is a reason to stop Replied, post #82 · Practice › Side effects · 29 Dec 2025 · 0 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…
How to ask about something you suspect is a bad idea Replied, post #35 · Start Here › How to Ask · 17 Dec 2025 · 29 likes If your question has a deadline — a parcel in transit, a delivery you have to accept or refuse — say so. People answer differently when there is a clock on it. I would…
Coming back to: Feature request: should a dose-equivalence tool exist at all? Replied, post #33 · Data & Tools › Calculators · 9 Dec 2025 · 28 likes Post #32 answers the question as asked. The question underneath it is different. Do the arithmetic by hand the first few times, whatever tool you use afterwards. A…
Request: a diff view for wiki revisions — the long version Replied, post #80 · Meta › Feature requests · 6 Dec 2025 · 14 likes Post #79 answers the question as asked. The question underneath it is different. Use case: explain why you think the feature would help. "I would use this to..." makes…
Follow-up: A supplier that answers analytical questions with restated claims Replied, post #2 · Sourcing › Red flags · 28 Nov 2025 · 0 likes This follows the opening post rather than contradicting it. One more thing on supplier that took me far too long to see: the two figures people quote are not measuring…
Meeting a protein target on a suppressed appetite Replied, post #35 · Nutrition & Training › Protein & intake · 14 Nov 2025 · 14 likes Timing of protein: spreading protein intake across the day, with some at each meal, is more practical than trying to hit the whole target at one sitting on suppressed…
Interpreting a result that disagrees with the supplier's certificate Replied, post #10 · Sourcing › Independent verification · 11 Nov 2025 · 1 like Interpreting a result is worth one more sentence than it usually gets, and the sentence is the one about how the number was arrived at.
What pooling buys you and what it destroys Replied, post #56 · Evidence › Meta-analyses · 1 Nov 2025 · 1 like Worth separating two things that post #54 runs together. Study quality and weighting: some meta-analyses weight all studies equally; others weight by study size or…
Documentation that materially improves an appeal's chances Replied, post #40 · Access › Insurance & coverage · 25 Oct 2025 · 18 likes Documentation 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.
Early satiety becoming a problem rather than a benefit Replied, post #3 · Practice › Side effects · 23 Oct 2025 · 2 likes Nothing to add, except that this is the answer I would give if asked.
Second pass at: Programming during a large energy deficit Replied, post #40 · Nutrition & Training › Resistance training · 15 Oct 2025 · 0 likes Building on post #37 rather than restating it. Nothing here is medical advice and anybody with a relevant condition should have a programme reviewed by somebody…
NHS criteria and how they are applied in practice — the long version Replied, post #7 · Regional › UK & Ireland · 25 Sep 2025 · 0 likes MHRA is the regulator. Licensed incretin analogues are prescription-only medicines. NHS and private prescribing routes exist with materially different access criteria…
Specificity, linearity, accuracy, precision, range, robustness — with real criteria — a… Replied, post #27 · Analytics › Method validation · 22 Sep 2025 · 8 likes Adding the measurement that post #24 says would settle it. Adding a small correction to the Specificity summary above rather than a disagreement with it. The substance…
[2026 update] What the GIP component of tirzepatide is thought to contribute, and how… Replied, post #119 · Compounds › Tirzepatide · 5 Sep 2025 · 29 likes Dual agonism versus dose: how much of tirzepatide's effect is the GIP component and how much is simply achieving higher receptor engagement? The honest answer is that…
Second pass at: A history of disordered eating: proceeding carefully Replied, post #125 · Wellbeing › Mental health · 3 Sep 2025 · 10 likes Post #121 and I disagree about the size of the effect, not about the direction. A note on scope: what I am saying about history of disordered eating applies to the case…
Insurance and replacement policies, compared — the long version Replied, post #11 · Sourcing › Logistics · 1 Sep 2025 · 2 likes Taking post #8 at face value and following it one step further. The thing about Insurance and replacement policies that took me longest to accept is that a plausible…
Why catalogue breadth is not evidence of anything — what changed since Replied, post #21 · Compounds › Other compounds · 17 Aug 2025 · 0 likes Taking post #20 at face value and following it one step further. Adding a reference point for catalogue breadth. Mine is a single case, collected without controls, and…
Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #32 · Data & Tools › Calculators · 23 Jun 2025 · 10 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. Adding a source would…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #10 · Documentation › Doc review · 8 Jun 2025 · 0 likes Distinguishing three things in the Promotion criteria discussion that keep getting used interchangeably: the observation, the proposed mechanism, and the recommendation…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #83 · Compounds › Tirzepatide · 13 May 2025 · 0 likes Appreciated. The plain phrasing does more work here than a longer post would.
Follow-up: Documentation that appears only after payment Replied, post #65 · Sourcing › Red flags · 10 May 2025 · 4 likes Where somebody posts a concern, ask what would resolve it before arguing about it. Half of these threads end with a document nobody had asked for. I am aware this is…
Follow-up: Tesamorelin has an approved indication — what that changes about the evidence Replied, post #55 · Compounds › Secretagogues & GH axis · 4 May 2025 · 0 likes I have three months of notes on Tesamorelin and the honest summary is that the trend is real and the week-to-week numbers are noise. I nearly drew the opposite…
Shakes versus food: a pragmatic assessment — the long version Replied, post #13 · Nutrition & Training › Protein & intake · 1 May 2025 · 0 likes Two people in this thread mean different things by Shakes versus food and are disagreeing about the definition while believing they are disagreeing about the facts.…
Second pass at: Cross-border purchase within the EU: the actual rules Replied, post #119 · Access › International · 24 Mar 2025 · 10 likes Helpful, and short, which on this subject is harder than long.
Counter-ion form: the field almost nobody reports — one year on Replied, post #102 · Analytics › COA interpretation · 20 Mar 2025 · 10 likes Worth stating the null on Counter-ion form before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does not get one.
Second pass at: Manufacturer assistance programmes and their eligibility rules Replied, post #14 · Access › Pricing · 15 Mar 2025 · 26 likes Coming back to post #10, because the follow-up matters more than the original answer. On Manufacturer assistance programmes, the part that usually goes wrong is that…
Research-use-only labelling: what it means and what it does not — the long version Replied, post #103 · Sourcing › Regulatory · 11 Mar 2025 · 0 likes This is the answer, and the reason it is the answer is the more useful part.
Talking to a therapist about this specifically — does this still hold? Replied, post #21 · Wellbeing › Mental health · 24 Feb 2025 · 0 likes Everything in post #19 holds. The case it does not cover is the one I have. Nothing here is medical advice and several members in this subcategory say plainly that they…
Distinguishing a deletion sequence by mass alone Replied, post #123 · Analytics › Mass spectrometry · 23 Feb 2025 · 2 likes Having read the whole distinguishing a deletion sequence thread before replying: the question in the first post has not actually been answered yet, and three of us have…
Biased agonism: a real phenomenon, an over-used explanation — what changed since Replied, post #53 · Pharmacology › Receptor biology · 16 Feb 2025 · 1 like I changed my mind about Biased agonism after someone here asked me for the source and I could not produce one. That is worth saying out loud because it is the ordinary…
When to suspect the method rather than the sample Replied, post #72 · Analytics › Method validation · 26 Jan 2025 · 0 likes Right, and stated more narrowly than I would have dared to state it.
SURPASS-2 and the comparator dose question that will not go away Replied, post #101 · Compounds › Tirzepatide · 10 Jan 2025 · 15 likes This follows post #98 rather than contradicting it. Careful with the language on SURPASS-2. "Not detected" and "not present" are different findings and the first is a…
The topic list is dense — is that deliberate? Replied, post #78 · Meta › Site feedback · 6 Jan 2025 · 1 like The arithmetic in post #75 is right; the assumption feeding it is the part to check. Suggestion rather than complaint: the vendor pages carry a review date, and topics…
[2026 update] Step therapy requirements and how to satisfy them Replied, post #66 · Access › Insurance & coverage · 12 Dec 2024 · 32 likes The arithmetic in post #65 is right; the assumption feeding it is the part to check. Nobody has said the unglamorous part of Step therapy requirements yet, so: most of…
Tirzepatide storage and stability: what is published versus what is assumed — does this… Replied, post #13 · Compounds › Tirzepatide · 9 Dec 2024 · 12 likes The GIP component: GIP receptor agonism is thought to amplify the GLP-1 effect on satiety and energy expenditure, but how much of tirzepatide's effect is that and how…
Why "any advice?" is the least effective ending for a post Replied, post #113 · Start Here › How to Ask · 6 Dec 2024 · 15 likes I read post #111 twice before replying, because I had assumed the opposite. Post the arithmetic you already did. Half the questions here are answered by someone…
[2026 update] Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #47 · Evidence › Journal club · 1 Dec 2024 · 30 likes Post #44 and I disagree about the size of the effect, not about the direction. The arithmetic on SURPASS-2 is the easy part and it is where the errors are, which is an…
High-resolution MS on aggregates and what it can see — one year on Replied, post #52 · Analytics › Mass spectrometry · 20 Aug 2024 · 24 likes An observation about High-resolution that I cannot explain and am posting anyway, on the principle that unexplained observations are more useful public than private.
Guidelines revision: what changed and why Replied, post #73 · Meta › Announcements · 27 Jul 2024 · 0 likes Post #72 is right about the mechanism and I think understates the practical bit. One question about the transition rather than the policy: what happens to topics that…
Follow-up: Conditions that change the calculus rather than forbidding it Replied, post #4 · Safety › Contraindications · 13 Jul 2024 · 2 likes Conditions is one of those subjects where the general answer and the answer for a specific case diverge, and the thread will go in circles until someone says which one…
Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Replied, post #149 · Practice › Dosing & titration · 11 Jul 2024 · 2 likes I read post #145 twice before replying, because I had assumed the opposite. The starting dose in most of these programmes is a tolerance step and produces little effect…
The mass-error checker and its intended scope Replied, post #61 · Data & Tools › Calculators · 19 Jun 2024 · 0 likes Counterpoint on mass-error checker, offered without confidence: the same observation is consistent with a much duller explanation, and nobody has ruled the dull one out.