cannula_notes

TL2 Member · Dresden, DE

Here for the documentation. Occasionally files a wiki request when a page has drifted out of date.

Joined 19 February 2025 · last posted 2d

87 posts, newest first. Showing up to 150.

How shortages have affected compounding permissions Replied, post #71 · Access › Shortages · 26 Jul 2026 · 2 likes Reports that a pharmacy has stock are the least durable information on the site and are still worth posting with a date. That is the version I use. It may not be the…
Coming back to: Preparing for an appointment: one page, three questions Replied, post #50 · Clinical › Prescriber conversations · 25 Jul 2026 · 4 likes A question phrased as "what would you want to see before considering X" is answerable and is not a request for X.
Reading order for a first week here, and what to skip until later — what changed since Replied, post #76 · Start Here › Welcome · 23 Jul 2026 · 0 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…
Why the timeline is on the right and not the left — what changed since Replied, post #68 · Meta › Site feedback · 5 Jul 2026 · 3 likes Accessibility: screen readers, keyboard navigation, contrast, font size — if something is not accessible to you, report it. Accessibility matters. I am reporting what…
Revisiting: Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #81 · Evidence › Journal club · 4 Jul 2026 · 10 likes On SURMOUNT-OSA the community has more anecdote than the confidence in this thread implies, and I include my own contribution in that.
Request: a per-category review queue Replied, post #78 · Meta › Feature requests · 4 Jul 2026 · 30 likes The failure mode on per-category review queue is boring rather than dramatic. It is almost always the step everyone assumes was done correctly because it is too simple…
How shortages have affected compounding permissions Replied, post #10 · Access › Shortages · 2 Jul 2026 · 1 like That is a fair summary of where the discussion has got to.
Retatrutide mass and identity: what a report should show Replied, post #7 · marked as the solution · Compounds › Retatrutide · 30 Jun 2026 · 7 likes Nausea and vomiting were dose-related in the phase 2 work, as they are throughout this class. What is not established is whether the tolerability profile differs from…
Second pass at: Programming during a large energy deficit Replied, post #45 · Nutrition & Training › Resistance training · 25 Jun 2026 · 0 likes Building on post #44 rather than restating it. Recovery: heavier training on a energy deficit and on a compound that slows gastric emptying requires attention to…
Why fasting instructions for oral semaglutide are not optional advice Replied, post #49 · Compounds › Oral incretins · 19 Jun 2026 · 0 likes Answering the question post #47 raises rather than the one it answers. PIONEER programme is phase 3 for oral semaglutide. The trials cover multiple indications and…
An appeal that succeeded, with the letter structure — the long version Replied, post #119 · Access › Insurance & coverage · 18 Jun 2026 · 0 likes Answering the question post #115 raises rather than the one it answers. The practical version of appeal is three sentences long. The rigorous version is three pages and…
Submitting a sample: the process end to end Replied, post #16 · Sourcing › Independent verification · 14 Jun 2026 · 8 likes What I want from this submitting a sample thread is the list of things that would need to be true for the claim to hold. If we can write that list, we can check it.
Official shortage notices and what they authorise Replied, post #97 · Access › Shortages · 10 Jun 2026 · 0 likes Compounding during shortages: some jurisdictions allow pharmacy compounding when a marketed product is in shortage. That permission is jurisdiction-specific and…
An appeal that succeeded, with the letter structure — the long version Replied, post #61 · Access › Insurance & coverage · 6 Jun 2026 · 10 likes Post #59 and I disagree about the size of the effect, not about the direction. Two things can be true about appeal at once: the mechanism is plausible and the evidence…
A certificate whose chromatogram axes do not match its stated method — one year on Replied, post #91 · Sourcing › Red flags · 6 Jun 2026 · 0 likes Post #90 is right about the mechanism and I think understates the practical bit. The honest answer on certificate whose chromatogram axes is that it depends, and the…
A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #29 · Practice › Storage & stability · 3 Jun 2026 · 24 likes Seconded. It reads as careful rather than confident, which is the right register.
What a certificate commits its issuer to — one year on Replied, post #73 · Analytics › COA interpretation · 22 May 2026 · 24 likes Post #71 put the caveat in the right place and I want to underline it. The fields that make one usable: lot identifier matching the container, test date, method…
Bariatric surgery history: altered anatomy, altered expectations Replied, post #11 · Clinical › Special populations · 16 May 2026 · 0 likes Post #9 put the caveat in the right place and I want to underline it. Medullary thyroid carcinoma history: an absolute contraindication because of the preclinical…
How this community labels and discusses unrefereed work — the long version Replied, post #3 · Evidence › Preprints · 9 May 2026 · 9 likes Community labels: I have looked for the primary source twice and failed twice. Either it does not exist or it is somewhere I do not know to look, and I would like to…
Prescription portability between countries Replied, post #24 · Access › International · 5 May 2026 · 31 likes Comparing prices across countries without accounting for what is included — device, needles, dispensing — produces comparisons that are not comparisons. I would want to…
What I would want from a home test that does not exist yet — what changed since Replied, post #10 · Analytics › Home & field testing · 3 May 2026 · 12 likes Coming back to post #8, because the follow-up matters more than the original answer. Ultraviolet absorbance at 280 nanometres estimates concentration for peptides…
[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #75 · Devices › Syringes & needles · 30 Apr 2026 · 11 likes Adding a small correction to the 0.3 ml versus 0.5 ml summary above rather than a disagreement with it. The substance holds; one of the figures is out by a factor that…
The 2.5 mg starting dose is not a therapeutic dose — why that matters Replied, post #96 · Compounds › Tirzepatide · 24 Apr 2026 · 31 likes Small methodological point on 2.5 mg starting dose: repeating a measurement is cheap and resolves most of what is being argued about here at no cost to anyone.
Deletion sequences: expected mass shifts by residue Replied, post #3 · Analytics › Impurities & related substances · 23 Apr 2026 · 2 likes Dimer and higher-order multimers: two or more peptide molecules bonded together. They appear at double the mass and higher. They may or may not separate from the…
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #5 · Compounds › Semaglutide · 21 Apr 2026 · 0 likes Picking up post #4: that is the part I would want checked first. Gastric emptying delay is the mechanism behind most of the gastrointestinal side effects. Slowing the…
CJC-1295 with and without DAC: what the modification does Replied, post #24 · Compounds › Secretagogues & GH axis · 1 Apr 2026 · 21 likes Since CJC-1295 keeps coming up, it should probably be a maintained page rather than a recurring thread. I am happy to draft it if someone with more direct experience…
Nausea profile of amylin analogues compared with GLP-1 agonists Replied, post #72 · Compounds › Cagrilintide & amylin analogues · 17 Mar 2026 · 0 likes Reconstitution at higher concentrations is worth avoiding for aggregation-prone material. The published formulation work generally uses lower concentrations than people…
Oral versus injected administration claims for BPC-157 Replied, post #16 · Compounds › Repair & healing peptides · 14 Mar 2026 · 5 likes If you are new and reading this thread for the answer to oral versus injected administration claims: the answer is conditional, the conditions are in the third reply,…
Splitting a weekly dose in two: the pharmacokinetic argument against Replied, post #22 · Practice › Dosing & titration · 11 Mar 2026 · 21 likes If symptoms reset at each step, that is the expected pattern rather than a sign that the previous adaptation was imaginary. Every dose increase is a new exposure. The…
[2026 update] Does a peptide degrade silently, with no visual change? Replied, post #32 · Practice › Storage & stability · 9 Mar 2026 · 2 likes Post #31 answers the question as asked. The question underneath it is different. Visible particulate is a strong signal in the other direction: it is a reason to stop…
Micro-titration: a disputed topic, argued properly Replied, post #43 · Practice › Dosing & titration · 7 Mar 2026 · 1 like Good question, well framed, and I would like to see it answered properly.
Ultrasound and skinfolds: operator dependence in practice — what changed since Replied, post #21 · Outcomes › Body composition · 3 Mar 2026 · 25 likes Bone mineral density changes with substantial weight loss are measurable and slow, and are one of the better reasons to have a baseline scan.
Type 2 diabetes and the largest part of the evidence base Started this topic · Clinical › Comorbidities · 8 Feb 2026 · 5 likes Posting this under the heading it deserves: Type 2 diabetes and the largest part of the evidence base Everything below is what sits behind that. Trying to work out what…
Managing an unplanned gap in supply Replied, post #24 · Access › Shortages · 6 Feb 2026 · 23 likes Nothing here is medical advice, and decisions about what to do during a supply interruption belong with a prescriber.
Filter needles: when they help and what they cost you Replied, post #33 · Devices › Syringes & needles · 23 Jan 2026 · 20 likes The most useful thing anyone has posted about filter needles in this category was a table of what had been measured and by whom. That is what I would want again.
Journal club: LEADER as the historical anchor Replied, post #25 · Evidence › Journal club · 20 Jan 2026 · 1 like What I want from this LEADER thread is the list of things that would need to be true for the claim to hold. If we can write that list, we can check it.
Which panel is worth repeating and which is worth ignoring — a second dataset Replied, post #54 · Clinical › Bloodwork · 18 Jan 2026 · 3 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. I would want a second opinion before relying on that.
A partial dose because the pen emptied mid-injection Replied, post #6 · Practice › Administration · 6 Jan 2026 · 0 likes Thank you for the correction. I would rather find out here than later.
The decimal-point error, and the habit that catches it Replied, post #21 · Practice › Reconstitution · 14 Dec 2025 · 3 likes If you are new and reading this thread for the answer to decimal-point error: the answer is conditional, the conditions are in the third reply, and the rest of the…
[2026 update] Storing lyophilised material long term: what governs the shelf life Replied, post #35 · Practice › Storage & stability · 12 Dec 2025 · 0 likes Lyophilised material is far more stable than the same material in solution. That is why suppliers ship it dry, and it is the reason to reconstitute only what will be…
EMA product information as a primary source Replied, post #75 · Regional › European Union · 16 Nov 2025 · 4 likes Following, with nothing to contribute beyond having asked the same thing elsewhere.
Second pass at: Programming during a large energy deficit Replied, post #80 · Nutrition & Training › Resistance training · 14 Nov 2025 · 2 likes Right — I had this wrong and I am glad to have read it before it mattered.
SURMOUNT-4 and what withdrawal data does and does not tell an individual — one year on Replied, post #65 · Compounds › Tirzepatide · 22 Oct 2025 · 2 likes Post #62 answers the question as asked. The question underneath it is different. On SURMOUNT-4: the maintained page in the documentation commons covers the general case…
A 40-week log with the measurement method stated Replied, post #29 · Outcomes › Progress reports · 18 Oct 2025 · 0 likes Where the 40-week log reasoning breaks down for me is the step from the group result to the individual case. That step is almost never argued for.
New subcategory: rationale and scope Replied, post #32 · Meta › Announcements · 15 Oct 2025 · 11 likes Scheduled maintenance: if the site is going offline for maintenance, advance notice will be posted here with the duration and scope.
What happens after your first post: likes, trust levels, and why none of it matters much… Replied, post #17 · Start Here › Welcome · 13 Oct 2025 · 17 likes Trust levels accumulate over time and they give you access to small things like the ability to edit your own posts without a timestamp. They are not a status symbol and…
Citing a preprint in a maintained document: our rule and its reasoning — does this still… Replied, post #53 · Evidence › Preprints · 30 Sep 2025 · 22 likes Practical experience of Citing a preprint, offered as one case with the conditions stated, not as a general finding. Conditions first, because they are what make it…
Revisiting: Reading a denial letter as a specification for your appeal Replied, post #138 · Access › Insurance & coverage · 28 Sep 2025 · 0 likes A peer-to-peer review is available in many systems and is frequently more productive than a written appeal, because it is a conversation with somebody who can decide.…
Second pass at: What "verified" means on our vendor pages, stated narrowly Replied, post #17 · Sourcing › Vendor reports · 20 Sep 2025 · 3 likes This follows post #16 rather than contradicting it. The cost of a submission is worth stating. It is the main reason people do not do this and knowing the figure helps…
Revisiting: Why I ask for the gradient before I discuss the number Replied, post #18 · Analytics › HPLC & UHPLC · 10 Sep 2025 · 19 likes If two laboratories disagree by more than two or three percentage points, work through method, integration, sample handling, whether it was the same lot and the same…
Pages past their review date, listed Replied, post #28 · Meta › Wiki maintenance · 8 Sep 2025 · 9 likes Careful with that. A short duplicated paragraph is sometimes better than a link, because the reader who needs it is mid-task and will not follow a link. The test is…
Coming back to: Oxidation and deamidation mass shifts, tabulated Replied, post #33 · Analytics › Mass spectrometry · 3 Sep 2025 · 6 likes Oxidation adds sixteen per oxygen and is the most common modification seen in aged material. Its presence in the spectrum is informative about handling as well as…
Hypertension improvement and when medication needs revisiting Replied, post #23 · Clinical › Comorbidities · 24 Aug 2025 · 10 likes Post #21 describes the usual case. This is about the unusual one. A condition that affects nutrition or absorption changes the calculus around a treatment that reduces…
[2026 update] Journal club: is percentage weight change the right endpoint? Replied, post #78 · Evidence › Journal club · 21 Aug 2025 · 13 likes Agreed on all of that, and I have nothing to add to it.
Semaglutide versus liraglutide head to head: reading STEP 8 carefully Replied, post #45 · Compounds › Semaglutide · 21 Aug 2025 · 0 likes Adding the measurement that post #42 says would settle it. The opalescent appearance in semaglutide solutions is occasionally noted and the mechanism is unclear. It…
When a preprint is the best available evidence and we say so Replied, post #73 · Evidence › Preprints · 19 Aug 2025 · 30 likes Worth separating two things that post #72 runs together. If you cite a preprint in a maintained document here, the convention is to label it in the sentence and to note…
Cross-border purchase within the EU: the actual rules Replied, post #8 · Access › International · 6 Aug 2025 · 0 likes Fair, and the limits you put on it are the part I will remember.
Sequence verification for an obscure compound: how it is done Replied, post #94 · Compounds › Other compounds · 16 Jul 2025 · 0 likes On post #92 — agreed on the reasoning, with one qualification. Anyone submitting an unusual compound for testing should tell the laboratory what it is rather than what…
Gauge and length selection for subcutaneous injection Replied, post #12 · Devices › Syringes & needles · 15 Jul 2025 · 1 like Gauge and length selection is a good example of a question where the honest answer is boring and the interesting answers are unsupported. I would go with boring.
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #124 · Compounds › Tirzepatide · 30 Jun 2025 · 29 likes The five maintenance doses in the tirzepatide programme give a genuine dose-response curve, which is unusual. Most trials in this space compare one or two doses against…
Sodium, potassium and magnesium when intake drops Replied, post #29 · Nutrition & Training › Hydration & electrolytes · 24 Jun 2025 · 0 likes Post #28 is the version of this I will quote in future. One addition. Constipation and hydration: dehydration makes constipation worse. Increasing fluid intake is the…
Second pass at: Semaglutide and alcohol: what is actually documented Replied, post #16 · Compounds › Semaglutide · 20 Jun 2025 · 4 likes Where I part company with post #12, and it is a narrow parting. Injection site does not appear to matter much for semaglutide exposure. The published comparisons of…
Why "any advice?" is the least effective ending for a post — the long version Replied, post #8 · Start Here › How to Ask · 31 May 2025 · 18 likes Chromatography questions need the method before anything else: column, gradient, wavelength, injection volume. A purity figure with no method attached cannot be…
Second pass at: Pen dose counters: what a click does and does not guarantee Replied, post #52 · Devices › Pens & autoinjectors · 29 May 2025 · 0 likes Post #51 describes the usual case. This is about the unusual one. Disposal of a used pen is a sharps question even where the needle is retracted, and local rules vary…
Coming back to: Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #2 · Compounds › Semaglutide · 20 May 2025 · 9 likes A request rather than an answer: could whoever has the primary source for Semaglutide half-life post it? I have seen the claim three times this month and each version…
Obstructive sleep apnoea and a hard endpoint in this class Replied, post #89 · Clinical › Comorbidities · 19 May 2025 · 5 likes Post #86 answers the question as asked. The question underneath it is different. A history of pancreatitis appears in the cautions for this class and the decision…
Asking about a compound your prescriber has not heard of Replied, post #38 · Clinical › Prescriber conversations · 13 May 2025 · 16 likes Bringing a record of symptoms with dates and severities makes an assessment materially easier and is the single most useful preparation. Written in the hope of being…
Counter-ion content and its effect on measured mass Replied, post #30 · Analytics › Mass spectrometry · 3 May 2025 · 0 likes Where I part company with post #26, and it is a narrow parting. Deamidation adds approximately one dalton and produces a species that frequently elutes very close to…
Excipient function in a licensed injectable Replied, post #4 · Pharmacology › Formulation chemistry · 28 Apr 2025 · 28 likes Isotonicity: an isotonic solution has the same osmotic pressure as blood. Non-isotonic solutions can cause discomfort on injection. Injectable peptide solutions are…
Reading order for a first week here, and what to skip until later Replied, post #74 · Start Here › Welcome · 9 Apr 2025 · 5 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…
Antibiotics and a course of something with delayed emptying Replied, post #13 · Practice › Interactions · 2 Apr 2025 · 21 likes Taking antibiotics seriously for a moment rather than deflecting: the honest position is that the community has observations and no controlled comparison, and those two…
Reading an MS report that only gives you a single number Replied, post #31 · Analytics › Mass spectrometry · 17 Mar 2025 · 5 likes Everything in post #29 holds. The case it does not cover is the one I have. Quantitation by MS: most quantitation is done by LC-UV detection at 214 nm, not by MS,…
A promotion I argued against, and why I lost Replied, post #135 · Documentation › Doc review · 16 Mar 2025 · 16 likes Where the review finds the content is right but the framing overstates it, that is the most valuable catch available at this stage. For what it is worth, the same held…
A supplier that answers analytical questions with restated claims Replied, post #35 · Sourcing › Red flags · 7 Mar 2025 · 0 likes I had written a reply contradicting post #33 and deleted it. Here is what survived. Keep the two claims separate. "The result on this lot did not match the certificate"…
[2026 update] Lipid changes during rapid weight loss: the expected trajectory Replied, post #40 · Clinical › Bloodwork · 1 Feb 2025 · 13 likes Checked the Lipid changes during rapid weight claim against the primary source this morning. It survives, with a narrower scope than the version quoted here. Posting…
The report format the maintainers ask for, and why each field is there — what changed… Replied, post #7 · Sourcing › Vendor reports · 29 Jan 2025 · 0 likes On post #5 — agreed on the reasoning, with one qualification. The format we ask for is compound, lot, testing service, method as reported, result, and the certificate…
Distinguishing a deletion sequence by mass alone Replied, post #24 · Analytics › Mass spectrometry · 27 Jan 2025 · 16 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…
Scheduled maintenance and what will be unavailable Replied, post #20 · Meta › Announcements · 20 Jan 2025 · 23 likes On post #16 — agreed on the reasoning, with one qualification. Answering the scheduled maintenance question as asked, then the question I think is meant. As asked: yes,…
Coming back to: Renal impairment: what the labelling says about dose Replied, post #25 · Clinical › Special populations · 29 Dec 2024 · 17 likes Coming back to post #23, because the follow-up matters more than the original answer. Renal and hepatic impairment studies are usually small dedicated pharmacokinetic…
What a seizure notice actually says Replied, post #19 · Sourcing › Logistics · 27 Dec 2024 · 13 likes Acknowledging rather than arguing. The reasoning holds as far as I can follow it.
Persistent vomiting and the threshold for seeking help — one year on Replied, post #15 · Safety › Adverse events · 19 Dec 2024 · 13 likes Pancreatitis is a genuine serious adverse event to know: severe epigastric pain, back pain, elevated lipase (≥3× upper limit of normal). If this constellation appears,…
Follow-up: Oral contraceptives and delayed emptying: what the data shows Replied, post #31 · Practice › Interactions · 18 Dec 2024 · 0 likes Delayed gastric emptying is the mechanism behind most of the plausible interactions in this class: anything whose absorption depends on how quickly the stomach empties…
Reading a preclinical wound-healing model and its relevance to a human tendon Replied, post #73 · Compounds › Repair & healing peptides · 17 Nov 2024 · 6 likes I would call the community position on reading a preclinical wound-healing model likely rather than established, and I would be comfortable defending that hedge.
Progressive overload when the scale is falling — one year on Replied, post #82 · Nutrition & Training › Resistance training · 23 Sep 2024 · 0 likes The number people quote for Progressive overload is a central estimate presented without its interval, and the interval is wide enough that the estimate is nearly…
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #62 · Analytics › COA interpretation · 22 Sep 2024 · 11 likes Taking post #61 at face value and following it one step further. A certificate is a statement by its issuer that a defined test was performed on a defined lot and…
Transit times by route, from a logged dataset — the long version Replied, post #3 · Sourcing › Logistics · 2 Aug 2024 · 11 likes Tracking stops updating: tracking last updated days ago usually means the package is in transit and will not update until it reaches the next scanning point. No update…
Journal club: FLOW and the renal composite, component by component Replied, post #39 · Evidence › Journal club · 12 Jul 2024 · 4 likes Where the group cannot agree, record the disagreement rather than resolving it by seniority. The recorded disagreement is more honest and more useful later. Written in…