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 Occasionally files a wiki request when a page has drifted out of date.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

89 posts, newest first. Showing up to 150.

How shortages have affected compounding permissions Replied, post #71 · Access › Shortages · 26 Jul 2026 · 2 likes Communication from suppliers: a supplier having supply problems usually communicates them. If a supplier goes silent, that is itself information.
Coming back to: Preparing for an appointment: one page, three questions Replied, post #50 · Clinical › Prescriber conversations · 25 Jul 2026 · 4 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…
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 I read post #74 twice before replying, because I had assumed the opposite. Welcome. The orientation materials are pinned at the top of this category and they take about…
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 Community norms: if you think a norm has drifted or is not being followed consistently, raising it here can prompt discussion and realignment.
Revisiting: Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #81 · Evidence › Journal club · 4 Jul 2026 · 10 likes SURPASS-2 (N Engl J Med 2021): Direct comparison of tirzepatide with semaglutide 1.0 mg. The 1.0 mg dose is not the highest available, which is the central and…
Request: a per-category review queue Replied, post #78 · Meta › Feature requests · 4 Jul 2026 · 30 likes Feature scope: some requests are for the site itself (search, filtering, navigation). Some are for the documentation (new topics, different formats). Scope helps…
How shortages have affected compounding permissions Replied, post #10 · Access › Shortages · 2 Jul 2026 · 1 like 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…
Retatrutide mass and identity: what a report should show Replied, post #7 · marked as the solution · Compounds › Retatrutide · 30 Jun 2026 · 7 likes Triple agonism: is the effect additive, synergistic, or neither? A phase 2 comparison of tirzepatide (dual) to retatrutide (triple) would answer that question. The…
Second pass at: Programming during a large energy deficit Replied, post #45 · Nutrition & Training › Resistance training · 25 Jun 2026 · 0 likes post #44 is right about the mechanism and I think understates the practical bit. Maintenance is the goal: preserving lean mass and strength during weight loss is the…
Why fasting instructions for oral semaglutide are not optional advice Replied, post #49 · Compounds › Oral incretins · 19 Jun 2026 · 0 likes Coming back to post #47, because the follow-up matters more than the original answer. Oral versus injectable exposure: comparing a 14 mg oral dose with a 0.5 mg…
An appeal that succeeded, with the letter structure — the long version Replied, post #119 · Access › Insurance & coverage · 18 Jun 2026 · 0 likes On post #115 — agreed on the reasoning, with one qualification. Coverage for weight management versus diabetes: many formularies cover these compounds for type 2…
Submitting a sample: the process end to end Replied, post #16 · Sourcing › Independent verification · 14 Jun 2026 · 8 likes VendorInvestigate: documentation and supplier-practice review. Reviews paperwork rather than vials. Tells you something about a supplier's systems but says nothing…
Official shortage notices and what they authorise Replied, post #97 · Access › Shortages · 10 Jun 2026 · 0 likes Shortage predictions: regulators and suppliers issue shortage alerts before they become acute. Checking the regulatory website for shortages gives you advance notice.
An appeal that succeeded, with the letter structure — the long version Replied, post #61 · Access › Insurance & coverage · 6 Jun 2026 · 10 likes I read post #59 twice before replying, because I had assumed the opposite. Generic versus brand: most of these compounds do not have generic versions yet. Once they do,…
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. Inconsistency across documents: a certificate stating one purity, a website claiming…
A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #29 · Practice › Storage & stability · 3 Jun 2026 · 24 likes Container choice matters: the material of the vial, the rubber closure, the fill volume all affect how quickly the contents degrade. Smaller fill volumes lose less to…
What a certificate commits its issuer to — one year on Replied, post #73 · Analytics › COA interpretation · 22 May 2026 · 24 likes I read post #71 twice before replying, because I had assumed the opposite. When method identifiers are missing: "reversed-phase HPLC" is less specific than…
Bariatric surgery history: altered anatomy, altered expectations Replied, post #11 · Clinical › Special populations · 16 May 2026 · 0 likes Coming back to post #9, because the follow-up matters more than the original answer. Gastroparesis: pre-existing severe delayed gastric emptying can worsen with…
How this community labels and discusses unrefereed work — the long version Replied, post #3 · Evidence › Preprints · 9 May 2026 · 9 likes Do not build anything on a preprint that you would mind rebuilding: if the preprint later changes substantially in revision or shows different results when published,…
Prescription portability between countries Replied, post #24 · Access › International · 5 May 2026 · 31 likes Licensed prescribing: where a compound is approved, prescribing is restricted to licensed prescribers. Where it is not approved, the legality of possession and use is…
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. Why third-party testing is stronger: a home test run by the person who made the…
Request: show the solution author in the topic list — what changed since Replied, post #50 · Meta › Feature requests · 2 May 2026 · 1 like Use case: explain why you think the feature would help. "I would use this to..." makes the request concrete.
[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 Syringe barrel size: common sizes are 0.3 mL, 0.5 mL, and 1.0 mL. Smaller barrels are more legible for small doses. Larger barrels hold larger volumes. Choose based on…
The 2.5 mg starting dose is not a therapeutic dose — why that matters Replied, post #96 · Compounds › Tirzepatide · 24 Apr 2026 · 31 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…
Deletion sequences: expected mass shifts by residue Replied, post #3 · Analytics › Impurities & related substances · 23 Apr 2026 · 2 likes Truncation products: fragments from incomplete synthesis or from degradation. They elute quite differently from the intact peptide because they are much smaller and…
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #5 · Compounds › Semaglutide · 21 Apr 2026 · 0 likes post #4 answers the question as asked. The question underneath it is different. Is there a ceiling dose beyond which the effect plateaus? The trials did not study that…
CJC-1295 with and without DAC: what the modification does Replied, post #24 · Compounds › Secretagogues & GH axis · 1 Apr 2026 · 21 likes Development history is more informative than speculation: ipamorelin was investigated clinically for post-operative ileus and was not taken forward to registration.…
Nausea profile of amylin analogues compared with GLP-1 agonists Replied, post #72 · Compounds › Cagrilintide & amylin analogues · 17 Mar 2026 · 0 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…
Oral versus injected administration claims for BPC-157 Replied, post #16 · Compounds › Repair & healing peptides · 14 Mar 2026 · 5 likes Why plausible mechanism is not evidence of effect: a mechanism that is chemically or biologically plausible can fail in practice for dozens of reasons —…
Splitting a weekly dose in two: the pharmacokinetic argument against Replied, post #22 · Practice › Dosing & titration · 11 Mar 2026 · 21 likes The arithmetic of an intermediate dose: if the label says 1.0 mg and 2.0 mg, a dose strictly between them is off-label by definition. Some people compute it anyway. 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 is right about the mechanism and I think understates the practical bit. Visual inspection: if a solution is visibly cloudy, discoloured, or contains particles,…
Micro-titration: a disputed topic, argued properly Replied, post #43 · Practice › Dosing & titration · 7 Mar 2026 · 1 like The arithmetic of an intermediate dose: if the label says 1.0 mg and 2.0 mg, a dose strictly between them is off-label by definition. Some people compute it anyway. The…
Ultrasound and skinfolds: operator dependence in practice — what changed since Replied, post #21 · Outcomes › Body composition · 3 Mar 2026 · 25 likes Changes during titration: measuring body composition during active titration is less useful than measuring after dose is stable. Titration causes fluid shifts that…
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. General question, not a…
Managing an unplanned gap in supply Replied, post #24 · Access › Shortages · 6 Feb 2026 · 23 likes Managing an unplanned gap: if a shortage causes a gap in treatment, the questions are how long the gap will be and how that affects your condition. Discussing with your…
Filter needles: when they help and what they cost you Replied, post #33 · Devices › Syringes & needles · 23 Jan 2026 · 20 likes Fixed versus detachable needles: insulin syringes usually have fixed needles (no dead volume loss to the hub). Luer-lock syringes use detachable needles (more dead…
Journal club: LEADER as the historical anchor Replied, post #25 · Evidence › Journal club · 20 Jan 2026 · 1 like Session format: read the paper before posting. The discussion is much better when everyone has. Start with the estimand and population, then methods, then results, then…
Which panel is worth repeating and which is worth ignoring — a second dataset Replied, post #54 · Clinical › Bloodwork · 18 Jan 2026 · 3 likes Renal function markers: eGFR is estimated, not measured. It depends on creatinine, age, and weight. A small change in creatinine might not mean a real change in kidney…
A partial dose because the pen emptied mid-injection Replied, post #6 · Practice › Administration · 6 Jan 2026 · 0 likes A site rotation scheme that actually works: abdomen, outer thigh, back of arm, outer hip. Rotate through them in order, move a minimum 2 cm between consecutive sites,…
The decimal-point error, and the habit that catches it Replied, post #21 · Practice › Reconstitution · 14 Dec 2025 · 3 likes Choosing a concentration on purpose rather than by accident: starting with "I want to draw 0.5 mL per dose" and working backward to the required concentration is more…
[2026 update] Storing lyophilised material long term: what governs the shelf life Replied, post #35 · Practice › Storage & stability · 12 Dec 2025 · 0 likes Freeze-thaw: some peptide solutions tolerate freezing poorly because ice crystals damage protein structure. Whether your specific solution tolerates it depends on the…
EMA product information as a primary source Replied, post #75 · Regional › European Union · 16 Nov 2025 · 4 likes On post #71 — agreed on the reasoning, with one qualification. Germany: BfArM implements EU framework. Statutory insurance (the majority) excludes "lifestyle medicines"…
Second pass at: Programming during a large energy deficit Replied, post #80 · Nutrition & Training › Resistance training · 14 Nov 2025 · 2 likes Volume: the number of sets per muscle group per week that supports muscle maintenance is roughly 12 to 18 hard sets. That varies by individual but gives a target range.
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 This follows post #62 rather than contradicting 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…
A 40-week log with the measurement method stated Replied, post #29 · Outcomes › Progress reports · 18 Oct 2025 · 0 likes 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…
New subcategory: rationale and scope Replied, post #32 · Meta › Announcements · 15 Oct 2025 · 11 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 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 post #16 answers the question as asked. The question underneath it is different. Marked solutions are the site's way of saying that someone asked a good question 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 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…
Revisiting: Reading a denial letter as a specification for your appeal Replied, post #138 · Access › Insurance & coverage · 28 Sep 2025 · 0 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…
Second pass at: What "verified" means on our vendor pages, stated narrowly Replied, post #17 · Sourcing › Vendor reports · 20 Sep 2025 · 3 likes post #16 is right about the mechanism and I think understates the practical bit. Dosing and purity: a vial that is 99% pure might contain 80% of its label claim if the…
Revisiting: Why I ask for the gradient before I discuss the number Replied, post #18 · Analytics › HPLC & UHPLC · 10 Sep 2025 · 19 likes Gradient slope is the single biggest driver of apparent purity differences. A shallower gradient over a longer run resolves more impurities and gives a higher purity…
Pages past their review date, listed Replied, post #28 · Meta › Wiki maintenance · 8 Sep 2025 · 9 likes Orphaned pages: if a page has no incoming links and is not reachable from navigation, it is orphaned. Such pages should either be linked or deprecated.
Coming back to: Oxidation and deamidation mass shifts, tabulated Replied, post #33 · Analytics › Mass spectrometry · 3 Sep 2025 · 6 likes Quantitation by MS: most quantitation is done by LC-UV detection at 214 nm, not by MS, because extinction coefficients are better known. MS can quantify if an internal…
Hypertension improvement and when medication needs revisiting Replied, post #23 · Clinical › Comorbidities · 24 Aug 2025 · 10 likes I read post #21 twice before replying, because I had assumed the opposite. PCOS and metabolic overlap: polycystic ovary syndrome has metabolic overlap with obesity and…
[2026 update] Journal club: is percentage weight change the right endpoint? Replied, post #78 · Evidence › Journal club · 21 Aug 2025 · 13 likes SURPASS-2 (N Engl J Med 2021): Direct comparison of tirzepatide with semaglutide 1.0 mg. The 1.0 mg dose is not the highest available, which is the central and…
Semaglutide versus liraglutide head to head: reading STEP 8 carefully Replied, post #45 · Compounds › Semaglutide · 21 Aug 2025 · 0 likes This follows post #42 rather than contradicting it. Is there a ceiling dose beyond which the effect plateaus? The trials did not study that because they stopped at 2.4…
When a preprint is the best available evidence and we say so Replied, post #73 · Evidence › Preprints · 19 Aug 2025 · 30 likes Coming back to post #71, because the follow-up matters more than the original answer. Unrefereed work is not worthless. A great deal of it survives review substantially…
Cross-border purchase within the EU: the actual rules Replied, post #8 · Access › International · 6 Aug 2025 · 0 likes Language barriers: if you need to communicate with a supplier, clinician, or regulator in a language not your first language, misunderstanding is possible. Clarify when…
Sequence verification for an obscure compound: how it is done Replied, post #94 · Compounds › Other compounds · 16 Jul 2025 · 0 likes Coming back to post #92, because the follow-up matters more than the original answer. Compounds this community declines to help with, and why: there are specifics in…
Gauge and length selection for subcutaneous injection Replied, post #12 · Devices › Syringes & needles · 15 Jul 2025 · 1 like Sharps disposal: needles and syringes should be disposed in a sharps container (a rigid, puncture-resistant container). Do not put them in regular trash. Many…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #124 · Compounds › Tirzepatide · 30 Jun 2025 · 29 likes Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own…
Sodium, potassium and magnesium when intake drops Replied, post #29 · Nutrition & Training › Hydration & electrolytes · 24 Jun 2025 · 0 likes post #28 is right about the mechanism and I think understates the practical bit. Magnesium: deficiency during weight loss is common and symptoms (fatigue, muscle…
Second pass at: Semaglutide and alcohol: what is actually documented Replied, post #16 · Compounds › Semaglutide · 20 Jun 2025 · 4 likes On post #12 — agreed on the reasoning, with one qualification. The 165 to 184 hour range: that is roughly 7 to 7.6 days, which is why the weekly schedule works. Below 4…
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 Arithmetic questions: write out the steps. "I have a 10 mg vial, I added 2 mL, I want a 0.25 mg dose, and I get this number for the syringe mark" is answerable. "How…
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 I read post #50 twice before replying, because I had assumed the opposite. Injection duration: most pens deliver the dose over several seconds. Holding the button down…
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 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…
Obstructive sleep apnoea and a hard endpoint in this class Replied, post #89 · Clinical › Comorbidities · 19 May 2025 · 5 likes This follows post #86 rather than contradicting it. PCOS and metabolic overlap: polycystic ovary syndrome has metabolic overlap with obesity and insulin resistance.…
Asking about a compound your prescriber has not heard of Replied, post #38 · Clinical › Prescriber conversations · 13 May 2025 · 16 likes Prescription logistics: confirm whether it will be filled locally, requires mail order, or will be prescribed off-label and needs a compounding pharmacy. Different…
Counter-ion content and its effect on measured mass Replied, post #30 · Analytics › Mass spectrometry · 3 May 2025 · 0 likes Worth separating two things that post #26 runs together. Sample matrix effects: if a sample is dissolved in a complex matrix, other compounds in the matrix can suppress…
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 Off-topic posts that do not belong here belong in the Lounge instead. You are not in trouble if a moderator moves your post — they are just routing it to the right…
Antibiotics and a course of something with delayed emptying Replied, post #13 · Practice › Interactions · 2 Apr 2025 · 21 likes Thyroid medications: semaglutide is associated with a slowing of gastric emptying, which might affect thyroid medication absorption if they are taken very close…
Maintainer handover: how it works Replied, post #67 · Meta › Wiki maintenance · 18 Mar 2025 · 9 likes This follows post #64 rather than contradicting it. Outdated external links: if a maintained page links to external sources and those links are broken or pages have…
Reading an MS report that only gives you a single number Replied, post #31 · Analytics › Mass spectrometry · 17 Mar 2025 · 5 likes Coming back to post #29, because the follow-up matters more than the original answer. Common adducts: sodium adds ≈22, potassium adds ≈38 compared to hydrogen. A…
A promotion I argued against, and why I lost Replied, post #135 · Documentation › Doc review · 16 Mar 2025 · 16 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.
A supplier that answers analytical questions with restated claims Replied, post #35 · Sourcing › Red flags · 7 Mar 2025 · 0 likes Coming back to post #33, because the follow-up matters more than the original answer. Rapid supplier turnover: a supplier that changes corporate structure, domain name,…
[2026 update] Lipid changes during rapid weight loss: the expected trajectory Replied, post #40 · Clinical › Bloodwork · 1 Feb 2025 · 13 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…
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 Coming back to post #5, because the follow-up matters more than the original answer. Pattern across lots: a single result is a data point. Three or four results from…
Distinguishing a deletion sequence by mass alone Replied, post #24 · Analytics › Mass spectrometry · 27 Jan 2025 · 16 likes Calibration matters: a high-resolution instrument out of calibration can report mass with ppm error large enough to be uninformative. Check when the instrument was last…
Scheduled maintenance and what will be unavailable Replied, post #20 · Meta › Announcements · 20 Jan 2025 · 23 likes Worth separating two things that post #16 runs together. Implementation timeline: announcements include when a change takes effect. Marking the date helps you know…
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. Gastroparesis: pre-existing severe delayed gastric emptying can worsen with…
What a seizure notice actually says Replied, post #19 · Sourcing › Logistics · 27 Dec 2024 · 13 likes post #18 is right about the mechanism and I think understates the practical bit. Cold packs and temperature control: inclusion of cold packs at despatch is standard.…
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 Anticoagulants: no direct interaction with the compounds in this class. Weight loss and body composition changes might affect the clearance or effect of warfarin if you…
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 Publication patterns in the BPC-157 literature: a large proportion of the evidence comes from one research group. That is not necessarily wrong — one group can do…
Progressive overload when the scale is falling — one year on Replied, post #82 · Nutrition & Training › Resistance training · 23 Sep 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.
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #62 · Analytics › COA interpretation · 22 Sep 2024 · 11 likes post #61 is right about the mechanism and I think understates the practical bit. When method identifiers are missing: "reversed-phase HPLC" is less specific than…
Transit times by route, from a logged dataset — the long version Replied, post #3 · Sourcing › Logistics · 2 Aug 2024 · 11 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…
Journal club: FLOW and the renal composite, component by component Replied, post #39 · Evidence › Journal club · 12 Jul 2024 · 4 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…