t.pereira

TL2 Moderator · Tilburg

Contributes reviews on supplier material. Based in Tilburg.

Joined 19 March 2025 · last posted 4d

78 posts, newest first. Showing up to 150.

Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #111 · Evidence › Journal club · 24 Jul 2026 · 8 likes post #110 answers the question as asked. The question underneath it is different. FLOW (N Engl J Med 2024): Semaglutide renal outcomes in type 2 diabetes and chronic…
[2026 update] Antibiotics and a course of something with delayed emptying Replied, post #82 · Practice › Interactions · 24 Jul 2026 · 15 likes Coming back to post #80, because the follow-up matters more than the original answer. Insulin interaction: semaglutide and tirzepatide are not contraindicated with…
Ultrasound and skinfolds: operator dependence in practice Replied, post #71 · Outcomes › Body composition · 23 Jul 2026 · 5 likes Lean mass loss during rapid weight reduction: depends on protein intake, resistance training volume, and total energy deficit. Adequate protein and maintaining training…
Alcohol: what is documented and what is folklore Replied, post #116 · Practice › Interactions · 17 Jul 2026 · 9 likes SGLT2 inhibitors: frequently co-administered and relevant to renal and cardiovascular discussion, not to interactions. There is no pharmacokinetic interaction of concern.
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #55 · Evidence › Journal club · 12 Jul 2026 · 2 likes Worth separating two things that post #51 runs together. SOUL (N Engl J Med 2025): Oral semaglutide cardiovascular outcomes. Extends the cardiovascular evidence to the…
What to bring: records that a clinician can actually use — a second dataset Replied, post #18 · Clinical › Prescriber conversations · 9 Jul 2026 · 8 likes Coming back to post #16, because the follow-up matters more than the original answer. Discussing off-label dosing: if you want to dose differently than the label…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #65 · Sourcing › Independent verification · 5 Jul 2026 · 9 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…
Search filters: what is missing Replied, post #76 · Meta › Site feedback · 3 Jul 2026 · 15 likes Feature requests: if the site would work better with a feature it does not have (better search, different filtering, new section) suggest it here with the reasoning.
Coming back to: Lateral-flow and colorimetric approaches: the specificity problem Replied, post #50 · Analytics › Home & field testing · 17 Jun 2026 · 29 likes I read post #48 twice before replying, because I had assumed the opposite. Precision of home tests: most consumer-accessible devices are not precise to the level people…
Coming back to: What the published dose-response for semaglutide actually looks like… Replied, post #26 · Compounds › Semaglutide · 13 Jun 2026 · 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.
Tracking a shortage from primary sources rather than rumour Replied, post #25 · Access › Shortages · 27 May 2026 · 33 likes Shortage predictions: regulators and suppliers issue shortage alerts before they become acute. Checking the regulatory website for shortages gives you advance notice.
Comparing prices across jurisdictions without misleading yourself Replied, post #4 · marked as the solution · Access › Pricing · 25 May 2026 · 9 likes Insurance tier placement: a compound might be covered but on a higher tier (higher copay). Moving to a lower tier usually requires prior authorization or documented…
Trust level 3 requirements: a clarification — does this still hold? Replied, post #40 · Meta › Announcements · 2 May 2026 · 12 likes Archives: older announcements are archived by date. Checking archives is useful if you want to know what changed when.
The anatomy of a question that gets answered within an hour Replied, post #31 · Start Here › How to Ask · 29 Apr 2026 · 1 like Asking a follow-up: new topic or reply in the old one? If the answer depends on the previous post, reply. If it is a question that makes sense without the previous…
Type 2 diabetes and the largest part of the evidence base Replied, post #83 · Clinical › Comorbidities · 26 Apr 2026 · 1 like This follows post #80 rather than contradicting it. Comorbidity control: if a comorbidity (high blood pressure, high lipids) is not adequately controlled, the decision…
Tracking intake honestly when appetite is absent Replied, post #6 · Nutrition & Training › Protein & intake · 22 Apr 2026 · 5 likes Fibre: adequate fibre intake supports fullness and gut motility, both of which matter during the gastrointestinal effects of these compounds. High fibre on top of…
Turnaround times and what they mean for a decision Replied, post #5 · Sourcing › Independent verification · 19 Apr 2026 · 5 likes Worth separating two things that the opening post runs together. Cost and turnaround: different services have different pricing and turnaround times. Janoshik's…
A site rotation scheme that is easy enough to actually follow Replied, post #43 · Practice › Administration · 18 Apr 2026 · 24 likes A genuinely late dose: the labelling generally says that if the next dose is more than a couple of days away, take it as soon as you notice. If the next dose is close,…
Type 2 diabetes and the largest part of the evidence base Replied, post #68 · Clinical › Comorbidities · 14 Apr 2026 · 21 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…
Run-in periods and the population they select Replied, post #97 · Evidence › Trials · 10 Apr 2026 · 29 likes Open-label design: unblinded trials admit expectation effects. For weight-loss trials where one arm loses substantial weight and the other does not, complete blinding…
Coming back to: Washout: how long is long enough, and for what purpose Replied, post #94 · Pharmacology › Pharmacokinetics · 4 Apr 2026 · 20 likes post #93 is right about the mechanism and I think understates the practical bit. For anyone arriving from a search: the marked solution above is the direct answer, and…
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #18 · Evidence › Journal club · 28 Mar 2026 · 12 likes TRIUMPH (ongoing): Retatrutide phase 3. No results yet. Nothing should be attributed to it because it has not finished. When it does, this discussion will return to it.
[2026 update] Publication patterns in the BPC-157 literature, examined Replied, post #17 · Compounds › Repair & healing peptides · 18 Mar 2026 · 0 likes This follows post #14 rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add…
Contributing data without breaching anyone's privacy Replied, post #17 · Data & Tools › Datasets · 3 Mar 2026 · 0 likes Picking up post #14: that is the part I would want checked first. Temporal bias: older data in a dataset might reflect conditions (supplier, formulation, context) that…
Revisiting: Language barriers in accessing a prescription abroad Replied, post #94 · Access › International · 6 Feb 2026 · 11 likes Currency and exchange rates: paying in different currencies has different costs and risks. Bitcoin eliminates currency and intermediary issues but has other risks.
[2026 update] Confounding by indication, explained with a concrete example Replied, post #19 · Evidence › Study critique · 1 Feb 2026 · 0 likes I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
A calculator that gives a right answer to the wrong question Replied, post #3 · Data & Tools › Calculators · 28 Jan 2026 · 32 likes This follows post #2 rather than contradicting it. Mass error checking: enter your observed mass and theoretical mass and check whether the difference in ppm is within…
Revisiting: Language barriers in accessing a prescription abroad Replied, post #77 · Access › International · 27 Jan 2026 · 0 likes Currency and exchange rates: paying in different currencies has different costs and risks. Bitcoin eliminates currency and intermediary issues but has other risks.
Second pass at: The topic list is dense — is that deliberate? Replied, post #48 · Meta › Site feedback · 19 Jan 2026 · 20 likes post #47 is right about the mechanism and I think understates the practical bit. Performance: if pages are slow to load, timeouts occur, or the site is unresponsive,…
Manufacturer assistance programmes and their eligibility rules Started this topic · Access › Pricing · 13 Jan 2026 · 3 likes On the subject in the title: Manufacturer assistance programmes and their eligibility rules Working notes rather than a conclusion. Documenting an access outcome,…
Tracking a preprint to publication: a worked example Replied, post #23 · Evidence › Preprints · 1 Dec 2025 · 0 likes Preprints for speed: some important preliminary findings are posted as preprints to disseminate quickly. That speed is useful but comes at the cost of not yet having…
Follow-up: Constipation management, with a dietitian's contribution Replied, post #30 · Practice › Side effects · 20 Nov 2025 · 29 likes Gallbladder complications: rapid weight loss increases the risk of gallstone formation. The mechanism is not specific to this drug class. The risk is greatest in the…
Publishing an inconvenient result: a case study — the long version Replied, post #40 · Sourcing › Independent verification · 17 Nov 2025 · 0 likes Coming back to post #38, 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…
Which panel is worth repeating and which is worth ignoring — a second dataset Replied, post #5 · Clinical › Bloodwork · 3 Nov 2025 · 0 likes This follows post #2 rather than contradicting it. A single value outside interval: usually uninformative on a single draw. What makes a result interesting: a trend…
Sleep tracking data and its considerable limitations Replied, post #60 · Wellbeing › Sleep · 22 Oct 2025 · 0 likes Coming back to post #58, because the follow-up matters more than the original answer. Apnoea monitoring: if you have diagnosed or suspected sleep apnoea, periodic…
Request: a diff view for wiki revisions — the long version Replied, post #44 · Meta › Feature requests · 18 Sep 2025 · 0 likes Coming back to post #42, because the follow-up matters more than the original answer. Alternatives: if you have thought of a way the current site might already serve…
Angle of injection and whether 90 degrees is always right Replied, post #20 · Practice › Administration · 9 Sep 2025 · 20 likes post #19 answers the question as asked. The question underneath it is different. For anyone arriving from a search: the marked solution above is the direct answer, and…
Hepatic impairment and the absence of data Replied, post #29 · Clinical › Special populations · 7 Sep 2025 · 10 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…
High-resolution MS on aggregates and what it can see Replied, post #44 · Analytics › Mass spectrometry · 15 Aug 2025 · 3 likes Tandem mass spectrometry: MS/MS fragments the molecular ion and uses fragment masses to confirm identity and detect modifications. A simple identity confirmation by…
Pinch or no pinch, and how needle length changes the answer Replied, post #19 · Practice › Administration · 14 Aug 2025 · 4 likes post #18 is right about the mechanism and I think understates the practical bit. Leak-back after withdrawal: a small amount of liquid on the skin after withdrawal is…
Revisiting: German, French and Dutch differences, compared Replied, post #54 · Regional › European Union · 4 Aug 2025 · 0 likes Pharmacy practice: pharmacies in different EU countries differ in conservatism about irregular prescriptions. Some will decline a prescription they consider irregular;…
Which panel is worth repeating and which is worth ignoring Replied, post #70 · Clinical › Bloodwork · 27 Jul 2025 · 0 likes Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol in the evening. Comparing results from different times of day is…
Sodium, potassium and magnesium when intake drops Replied, post #79 · Nutrition & Training › Hydration & electrolytes · 27 Jul 2025 · 1 like I read post #77 twice before replying, because I had assumed the opposite. Water intoxication: drinking excessive water (more than a few liters per day for extended…
History of disordered eating and why it changes the conversation Replied, post #5 · Clinical › Special populations · 17 Jul 2025 · 0 likes Worth separating two things that the opening post runs together. Adolescents: a distinct evidence base exists. The compounds are not approved for routine adolescent…
[2026 update] What we do not know about retatrutide, listed explicitly Replied, post #9 · Compounds › Retatrutide · 12 Jul 2025 · 24 likes post #8 is right about the mechanism and I think understates the practical bit. Phase 2 sample sizes are not adequate for safety characterisation of a novel triple…
Repeatability versus intermediate precision Replied, post #82 · Analytics › Method validation · 28 Jun 2025 · 1 like post #81 answers the question as asked. The question underneath it is different. Forced degradation studies: deliberately stress the material with acid, base, oxidant,…
Journal club: the CagriSema phase 2 combination paper — a second dataset Replied, post #48 · Evidence › Journal club · 21 Jun 2025 · 23 likes I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
Amylin analogue mechanism: satiety signalling separate from GLP-1 Replied, post #136 · Compounds › Cagrilintide & amylin analogues · 18 Jun 2025 · 6 likes Reading the phase 2 paper: it establishes tolerability and efficacy in a selected population on a defined dose escalation. It does not establish the lowest effective…
Realistic expectations for strength while losing weight quickly Replied, post #3 · Nutrition & Training › Resistance training · 17 Jun 2025 · 19 likes Cardio and resistance: the interaction between energy-intense cardiovascular training and resistance training is real. Moderate cardio is fine; excessive endurance…
Validating a calculator against hand arithmetic — what changed since Replied, post #119 · Data & Tools › Calculators · 7 Jun 2025 · 0 likes The calculators maintained on this site are open-source and verifiable. They are intended to check arithmetic, not to replace medical judgement. Using them is optional…
Lyophilisation and why the cake looks the way it does Replied, post #4 · Pharmacology › Formulation chemistry · 6 Jun 2025 · 31 likes Preservatives: solutions for multi-dose vials contain preservatives (benzyl alcohol, phenol, or others) to inhibit microbial growth after the vial has been entered.…
Reading a supplier's product description as a marketing document Replied, post #25 · Compounds › Other compounds · 22 May 2025 · 9 likes post #24 is right about the mechanism and I think understates the practical bit. Thank you for the correction. I have edited my earlier post with a note rather than…
A well-designed study with a badly written abstract Replied, post #80 · Evidence › Study critique · 13 May 2025 · 12 likes post #79 answers the question as asked. The question underneath it is different. Generalisability: do the inclusion/exclusion criteria narrow the population so much…
Coming back to: An 18-month record including the parts that went badly Replied, post #46 · Outcomes › Progress reports · 1 May 2025 · 31 likes Rate of change: reporting progress as "lost 5 kg in 12 weeks" is more useful than "currently at 82 kg" because the rate tells you whether the change is steady,…
Certificates issued by the seller versus by a laboratory Replied, post #62 · Analytics › COA interpretation · 26 Apr 2025 · 0 likes Amino acid analysis gives content: it hydrolyses the peptide and quantifies the residues. It measures the peptide content independent of chromatographic purity. Very…
Why the timeline is on the right and not the left Replied, post #10 · Meta › Site feedback · 21 Apr 2025 · 20 likes Moderation decisions: if you disagree with a moderation decision, raising it here gives it visibility. Staff will reconsider if you make a substantive case.
A ten-fold dose error caught before injection Replied, post #17 · Devices › Syringes & needles · 5 Apr 2025 · 2 likes 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…
Units, standards, and other things that quietly hold the world together Replied, post #9 · Lounge › Off topic · 31 Mar 2025 · 8 likes Humour: light, relevant humour is welcome. Cruel humour targeting individuals or groups is not.
What the published dose-response for semaglutide actually looks like above 2.4 mg — a… Replied, post #125 · Compounds › Semaglutide · 31 Mar 2025 · 14 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…
Cost per milligram, computed honestly across formats — the long version Replied, post #42 · Access › Pricing · 23 Mar 2025 · 0 likes This follows post #39 rather than contradicting it. Biosimilars and future generics: as patents expire, biosimilar and generic versions might become available and…
Identical chromatograms across two different lots Replied, post #85 · Sourcing › Red flags · 2 Feb 2025 · 24 likes Safety documentation absent: a supplier that cannot provide information about sterility testing, endotoxin testing, or safety documentation when asked is raising flags.
Why the Start Here categories exist, and what they are not for — one year on Replied, post #9 · Start Here › Welcome · 29 Jan 2025 · 0 likes Introducing yourself is fine and requires no question. Post in this subcategory, describe the context that matters for why you are here, and lurk for a bit before…
State-level differences that actually matter Started this topic · Regional › North America · 28 Jan 2025 · 1 like On the subject in the title: State-level differences that actually matter Working notes rather than a conclusion. Documenting an access outcome, dated, because…
Second pass at: Certificates issued by the seller versus by a laboratory Replied, post #41 · Analytics › COA interpretation · 22 Jan 2025 · 9 likes On post #37 — agreed on the reasoning, with one qualification. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly…
Canadian access and provincial variation Replied, post #4 · Regional › North America · 19 Jan 2025 · 2 likes Canada: Health Canada licenses compounds. Prescribing is provincial. Compounds are prescription-only. Coverage varies between public and private insurance.
Escalating every six weeks instead of four: what I observed over eight months Replied, post #5 · Practice › Dosing & titration · 2 Jan 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…
Follow-up: Tirzepatide's shorter half-life and its one practical consequence Replied, post #76 · Compounds › Tirzepatide · 8 Dec 2024 · 14 likes Coming back to post #74, because the follow-up matters more than the original answer. Two things before anyone answers the substance. First, the context in the first…
Washout with a one-week half-life: the arithmetic Replied, post #14 · Research Methods › N-of-1 designs · 24 Nov 2024 · 9 likes On post #10 — agreed on the reasoning, with one qualification. Blinding: blinding yourself (not knowing which condition you are in) removes expectation bias. This is…
A revision dispute resolved on the topic rather than in the history — a second dataset Replied, post #22 · Meta › Wiki maintenance · 31 Oct 2024 · 3 likes On post #18 — agreed on the reasoning, with one qualification. Review dates: each maintained page has a review date (the date by which it should be checked). If a page…
Second pass at: Reimbursement variation across member states Replied, post #14 · Regional › European Union · 29 Sep 2024 · 0 likes This follows post #11 rather than contradicting it. Reimbursement varies substantially by member state. Some (Germany, France, Netherlands) restrict weight-management…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #68 · Nutrition & Training › Hydration & electrolytes · 31 Aug 2024 · 0 likes Lab testing: if symptoms are severe or persistent, checking electrolytes and minerals (sodium, potassium, magnesium, calcium) and interpreting them in context of losses…
Coming back to: Preparing for an appointment: one page, three questions Replied, post #34 · Clinical › Prescriber conversations · 8 Aug 2024 · 7 likes Picking up post #31: that is the part I would want checked first. Asking about monitoring: understand what lab work will be done, how often, and what you will be…
What a stability-indicating method is and how you demonstrate one — one year on Replied, post #3 · Analytics › Method validation · 15 Jul 2024 · 30 likes Limits of detection and quantitation: LOD is the lowest concentration that produces a signal above background. LOQ is the lowest concentration at which the method meets…
Journal club: FLOW and the renal composite, component by component Replied, post #49 · Evidence › Journal club · 13 Jul 2024 · 1 like This follows post #46 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Replied, post #26 · Practice › Dosing & titration · 7 Jul 2024 · 8 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…
The mass-error checker and its intended scope Replied, post #82 · Data & Tools › Calculators · 28 Jun 2024 · 0 likes Picking up post #79: that is the part I would want checked first. Offline use: all calculators are written in JavaScript and can be downloaded and run offline if…
Assessing a warm arrival: the decision process — one year on Replied, post #83 · Sourcing › Logistics · 31 May 2024 · 5 likes Worth separating two things that post #79 runs together. Insurance and carrier liability: most parcel carriers limit liability. Understanding the limits before choosing…
Assessing a warm arrival: the decision process — one year on Replied, post #7 · Sourcing › Logistics · 28 May 2024 · 0 likes Customs outcomes are not predictable at the level of an individual parcel. What is predictable is that consistent, accurate declarations correlate with fewer…