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dosing-math

Page 4 of 34 · 811 questions tagged dosing-math.

811 questions · sorted by votes · page 4 of 34

35 votes5 answers32k views
How many vial-days does a 2.5 mg vial give at 5 mg/mL on a weekly schedule?

Concretely: 2.5 mg · 5 mg/mL. Please show the division. I want to check my own against yours. I would like the general form as well as the specific number, so I can…

dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
cost-analysis
cost-analysis

Cost arithmetic done honestly: cost per milligram after dead-space loss, list versus net price, comparing a multi-dose vial to a fixed-dose pen,…

261 questions
diluent-volume
diluent-volume

Choosing how much diluent to add, which is really a question about what you want your measurement resolution to be. Larger volumes buy you…

308 questions
asked by anouk_desmet 18k · 19 months ago
35 votes 3 answers32k views
What does PIONEER-4 report at the 20 mg dose level?

For reference: PIONEER-4 · 20 mg. I have the document in front of me and I can read the numbers. What I cannot do is interpret them. I am reasonably comfortable with…

clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
titration
titration

Stepwise dose increases over weeks, why the label schedules exist at all, and what tolerability-driven deviation from a schedule looks like in…

444 questions
asked by valentina_rossi 16k · 18 months ago
35 votes 5 answers31k views
Is 15 mg in 1.5 mL of phosphate-buffered diluent a sensible presentation for dulaglutide?

For reference: 15 mg · 1.5 mL · phosphate-buffered diluent · dulaglutide. I would like to define my thresholds before I have a result, for obvious reasons. I want a…

diluent-volume
diluent-volume

Choosing how much diluent to add, which is really a question about what you want your measurement resolution to be. Larger volumes buy you…

308 questions
reconstitution
reconstitution

Taking a lyophilised vial to a solution of known concentration: choice of diluent, volume selection, how to add liquid without shearing the cake,…

330 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by bea_castellanos 47k · 14 months ago
35 votes5 answers31k views
How do I compute the +2 charge state m/z for a peptide of 4207.2 Da?

What I have: +2 · 4207.2 Da. This should be a straightforward calculation and I keep getting two different answers. The numbers are arbitrary; the method is what I am…

mass-spec
mass-spec

Mass spectrometry for identity confirmation: electrospray ionisation, multiple charge states, monoisotopic versus average mass, deconvolution, and…

38 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
purity
purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

788 questions
asked by liam_bracken 12k · 22 months ago
35 votes5 answers28k views
How many units on a U-40 insulin syringe is a 4 mg dose at 1 mg/mL?

Stated plainly: a U-40 insulin syringe · 4 mg · 1 mg/mL. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked the order of…

dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
reconstitution
reconstitution

Taking a lyophilised vial to a solution of known concentration: choice of diluent, volume selection, how to add liquid without shearing the cake,…

330 questions
asked by Dr_Idris_Coulibaly 40k · 15 months ago
35 votes3 answers16k views
Is 60 mg weekly a defensible maintenance dose for mazdutide?

Setup, so nobody has to ask: 60 mg · mazdutide. I would like to set this up properly once, rather than adjust it repeatedly. My budget is real but not tight, and my…

maintenance-dose
maintenance-dose

Staying put: the lowest dose that holds a result, the difference between the maximum studied dose and the maximum useful dose, and what the…

44 questions
clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by bridget_nyathi 16k · 17 months ago
34 votes 5 answers60k views
Is 40 mg weekly a defensible maintenance dose for tirzepatide?

Conditions: 40 mg · tirzepatide. The failure mode I am trying to avoid is making this decision emotionally. I have twelve months in view and I would like the plan to…

maintenance-dose
maintenance-dose

Staying put: the lowest dose that holds a result, the difference between the maximum studied dose and the maximum useful dose, and what the…

44 questions
clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
sleep-apnea
sleep-apnea

Obstructive sleep apnoea and the apnoea-hypopnoea index response to weight loss, including the SURMOUNT-OSA dataset and the question of whether…

14 questions
asked by Dr_Idris_Coulibaly 40k · 23 months ago
34 votes5 answers52k views
If a retatrutide dose is missed by three days, does the ladder reset?

Setup, so nobody has to ask: retatrutide · three days. Everything I have found on this is either a forum aside or a product page, neither of which I trust. I am…

missed-dose
missed-dose

What the label instructions for a missed weekly dose are, why they differ between agents, and what the pharmacokinetics say about drift in an…

41 questions
titration
titration

Stepwise dose increases over weeks, why the label schedules exist at all, and what tolerability-driven deviation from a schedule looks like in…

444 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by sample_id 17k · 2.2 years ago
34 votes5 answers47k views
Does splitting a 4 mg weekly dose of semaglutide across two administrations change anything?

The particulars: 4 mg · semaglutide. I would like the mechanism, because I want to be able to reason about the cases nobody has written about. I have tried to reason…

split-dosing
split-dosing

Dividing a weekly dose across more than one administration. Questions here concern the pharmacokinetic rationale, whether the peak-to-trough ratio…

39 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
glp1-mechanism
glp1-mechanism

Receptor-level pharmacology: GLP-1R as a class B GPCR, cAMP and PKA signalling, biased agonism, internalisation and resensitisation, and the…

175 questions
asked by stopper_core 50k · 19 months ago
34 votes 3 answers45k views
Does splitting a weekly dose into two half-doses actually flatten the concentration curve?

The argument I keep encountering for splitting a weekly dose into two half-doses three or four days apart is that it lowers the peak and raises the trough, and that a…

split-dosing
split-dosing

Dividing a weekly dose across more than one administration. Questions here concern the pharmacokinetic rationale, whether the peak-to-trough ratio…

39 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
semaglutide
semaglutide

A GLP-1 receptor agonist with a fatty-acid-acylated backbone and a roughly one-week half-life, marketed for type 2 diabetes and for weight…

360 questions
glp1-mechanism
glp1-mechanism

Receptor-level pharmacology: GLP-1R as a class B GPCR, cAMP and PKA signalling, biased agonism, internalisation and resensitisation, and the…

175 questions
asked by mass_shift_18 14k · 20 months ago
34 votes5 answers41k views
What is the dead-space loss per draw with a 30G needle at 8 mg/mL?

The case in front of me: a 30G needle · 8 mg/mL. Please show the division. I want to check my own against yours. I would like the general form as well as the specific…

dead-space
dead-space

The volume trapped in the syringe hub and needle after the plunger bottoms out. It is small in absolute terms and large as a fraction of a small…

110 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by fill_volume 13k · 14 months ago
34 votes 5 answers38k views
How many units on a low-dead-space syringe is a 50 mg dose at 1 mg/mL?

What I am working with: a low-dead-space syringe · 50 mg · 1 mg/mL. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked…

dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
reconstitution
reconstitution

Taking a lyophilised vial to a solution of known concentration: choice of diluent, volume selection, how to add liquid without shearing the cake,…

330 questions
asked by m_haraldsen 38k · 21 months ago
34 votes 5 answers38k views
What is the dead-space loss per draw with a 30G needle at 3.33 mg/mL?

The case in front of me: a 30G needle · 3.33 mg/mL. I want the working, not the result — I need to be able to redo it with different numbers. I care about the…

dead-space
dead-space

The volume trapped in the syringe hub and needle after the plunger bottoms out. It is small in absolute terms and large as a fraction of a small…

110 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by unit_math 13k · 22 months ago
34 votes 5 answers29k views
What does SURPASS-2 report at the 8 mg dose level?

Conditions: SURPASS-2 · 8 mg. The figures are clear enough; the question is what they mean and what they do not. I can supply the numbers if the specifics change the…

clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
titration
titration

Stepwise dose increases over weeks, why the label schedules exist at all, and what tolerability-driven deviation from a schedule looks like in…

444 questions
asked by triple_agonist_q 37k · 18 months ago
34 votes0 answers26k views
How does ecnoglutide at 30 mg weekly compare on cost per milligram across routes?

Conditions: ecnoglutide · 30 mg. I want the working, not the result — I need to be able to redo it with different numbers. I care about the precision as well as the…

cost-analysis
cost-analysis

Cost arithmetic done honestly: cost per milligram after dead-space loss, list versus net price, comparing a multi-dose vial to a fixed-dose pen,…

261 questions
vendor-comparison
vendor-comparison

Side-by-side comparison of suppliers on measurable axes - independently confirmed purity and content, lead time, cold-chain handling,…

351 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by zainab_mustafa 16k · 2.1 years ago
34 votes 5 answers25k views
What is the arithmetic to convert 5 mg in 1 mL into units on a U-100 scale?

What I am working with: 5 mg · 1 mL. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked the order of magnitude and it…

dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
reconstitution
reconstitution

Taking a lyophilised vial to a solution of known concentration: choice of diluent, volume selection, how to add liquid without shearing the cake,…

330 questions
asked by gel_pack_warm 13k · 17 months ago
34 votes 4 answers21k views
How can a vial be 99% pure by HPLC and still contain under 7 mg of a nominal 10 mg?

I sent two vials from two different batches, both labelled 10 mg semaglutide, for independent testing and asked for purity and quantification on each. The results…

purity
purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

788 questions
content-assay
content-assay

Quantified content: how many milligrams of peptide are actually in the vial, measured against a calibrated reference standard. A separate test…

438 questions
coa
coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

749 questions
hplc
hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

466 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by seamus_brady 17k · 18 months ago
34 votes1 answer19k views
Can I reconstitute mazdutide at 10 mg/mL and still measure a small dose accurately?

Details up front: mazdutide · 10 mg/mL. I would rather over-plan the first cycle and simplify later. I am prepared to do the work if someone can tell me which work…

diluent-volume
diluent-volume

Choosing how much diluent to add, which is really a question about what you want your measurement resolution to be. Larger volumes buy you…

308 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by mass_shift_18 14k · 12 months ago
34 votes 5 answers16k views
Is 1 mg/mL a sensible working concentration for oral semaglutide, or should I go lower?

The case in front of me: 1 mg/mL · oral semaglutide. I would like the axes of comparison first and the recommendation second. I have tried the first option and it…

diluent-volume
diluent-volume

Choosing how much diluent to add, which is really a question about what you want your measurement resolution to be. Larger volumes buy you…

308 questions
reconstitution
reconstitution

Taking a lyophilised vial to a solution of known concentration: choice of diluent, volume selection, how to add liquid without shearing the cake,…

330 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by Dr_Hanne_Solberg 40k · 18 months ago
34 votes 5 answers16k views
What is the arithmetic to convert 10 mg in 5 mL into units on a U-100 scale?

Conditions: 10 mg · 5 mL. Please show the division. I want to check my own against yours. I would like the general form as well as the specific number, so I can apply…

dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
insulin-syringe
insulin-syringe

U-100 and U-40 insulin syringes as measuring instruments. A U-100 syringe is graduated in insulin units where 100 units equals 1 mL, so one unit…

268 questions
reconstitution
reconstitution

Taking a lyophilised vial to a solution of known concentration: choice of diluent, volume selection, how to add liquid without shearing the cake,…

330 questions
asked by eoin_mcgarry 16k · 17 months ago
34 votes 5 answers15k views
How many vial-days does a 20 mg vial give at 2 mg/mL on a weekly schedule?

Stated plainly: 20 mg · 2 mg/mL. I have worked this out and I would like someone to find the error, because I suspect there is one. My working so far, for the record,…

dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
cost-analysis
cost-analysis

Cost arithmetic done honestly: cost per milligram after dead-space loss, list versus net price, comparing a multi-dose vial to a fixed-dose pen,…

261 questions
diluent-volume
diluent-volume

Choosing how much diluent to add, which is really a question about what you want your measurement resolution to be. Larger volumes buy you…

308 questions
asked by hana_petrikova 19k · 14 months ago
34 votes 5 answers15k views
Is 4 mg weekly a defensible maintenance dose for survodutide?

The specifics, since they change the answer: 4 mg · survodutide. I am at the decision point and I would rather think it through than improvise. I would rather spend…

maintenance-dose
maintenance-dose

Staying put: the lowest dose that holds a result, the difference between the maximum studied dose and the maximum useful dose, and what the…

44 questions
clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by oona_kekkonen 16k · 16 months ago
34 votes0 answers12k views
How many weeks to steady state for retatrutide on a weekly schedule?

The receptor pharmacology I can follow; the in vivo translation is where I lose the thread. I have worked this out and I would like someone to find the error, because…

glp1-mechanism
glp1-mechanism

Receptor-level pharmacology: GLP-1R as a class B GPCR, cAMP and PKA signalling, biased agonism, internalisation and resensitisation, and the…

175 questions
titration
titration

Stepwise dose increases over weeks, why the label schedules exist at all, and what tolerability-driven deviation from a schedule looks like in…

444 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by shear_at_the_front 15k · 14 months ago
34 votes 3 answers7.4k views
My TSH keeps drifting and I take levothyroxine — is it the weight loss or the gastric emptying?

Hypothyroid on 125 µg levothyroxine for six years, stable TSH around 1.4 mIU/L that whole time. Since starting tirzepatide nine months ago and losing 21 kg, my TSH…

thyroid
thyroid

Thyroid questions: the rodent C-cell findings behind the labelled warning, human calcitonin data, TSH drift during weight loss, and the…

14 questions
hormones
hormones

Endocrine changes accompanying substantial weight loss: sex hormone binding globulin, testosterone, oestradiol, cortisol and the reproductive…

14 questions
bloodwork
bloodwork

Laboratory monitoring: which panels are worth ordering, sensible intervals, reference-range versus optimal-range arguments, and how to read a…

284 questions
dosing-math
dosing-math

The arithmetic itself: milligrams to millilitres to insulin units, concentration after reconstitution, dose per draw, and vial-days per vial. Show…

811 questions
asked by bea_forsberg 14k · 2 months ago