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c/reconstitution·posted 7 months ago by u/hub_ops

[Discussion] can we stop arguing about bacteriostatic water until somebody posts a number

Discussion Cold Box ×1 Sourced ×2 Receipts ×2

insulin syringe. That is the whole post, but I will justify it.

Everything else people worry about in c/glp1muscle is downstream of it. Titration speed, reflux, the endless dose arguments — most of it resolves if you sort insulin syringe out first, and almost nobody does.

I say this having got it wrong for 4 months. My fasting insulin was the thing that eventually made me pay attention, which is a stupid way to learn a lesson that was in the sidebar the whole time.

3,152 up / 532 down86% upvoted45 commentsid 8rhv8o21 Dec 2025

45 comments

30 in this archive, depth 5

best — the order this archive was captured in

u/dexa_twice_yearlybody comp417 points·7 months ago

The evidence standard in c/vendorvetting gets called too strict about once a month, and every time, the thread ends with the complainant agreeing.

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u/karl_fischer_kev200 points·7 months ago

This is correct. 2mL versus 9mL is the common mistake.

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[removed]74 points·7 months ago

[removed by moderator]

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u/janek_ferrari135 points·7 months ago

Yeah, showing the arithmetic is the fastest way for someone to spot the error.

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u/saskia_mwangi76 points·7 months ago

the concentration on the vial in marker is the most important step

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u/hub_opsOPsite staff56 points·7 months ago

Reconstituted at 3mL when I meant 6mL. Caught it because the units looked wrong. Write the concentration.

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u/elodie_grimaldi150 points·7 months ago·edited

the concentration on the vial in marker is the most important step

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u/hub_opsOPsite staff60 points·7 months ago

more water means more units for the same dose, which means finer resolution

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u/sock_puppet_spotter344 points·7 months ago

This is correct. 2mL versus 17mL is the common mistake.

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u/mateusz_achebe-17 points·7 months ago

This is correct.

Disagree on that part. 99.2% and 99.3% on the same vial is normal.

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u/ines_ekstrom1 point·7 months ago

dosing errors come from people reconstituting two vials differently and forgetting which is which

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u/kavya_radich192 points·7 months ago

i am begging people to write down the concentration

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u/ines_ekstrom59 points·7 months ago

never post a calculation as advice without stating the concentration

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u/julia_erdogan32 points·7 months ago

Small correction: the trial was 19 weeks, not 14. Does not change your point but people will quote it.

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u/emil_zamora11 points·7 months ago

Are you using a u-100 or u-40 syringe? That changes everything.

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u/clara_weiss6 points·7 months ago

30mg vial, 2mL water, concentration is 30/2 — write it on the vial afterwards

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u/batch_number_bertievetting18 points·7 months ago

This is correct. 2mL versus 24mL is the common mistake.

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u/arto_falk160 points·7 months ago·edited

Dead space ate 6 units on a low-volume draw. Tiny impact at 0.5mg, massive impact at 0.25mg.

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u/vial_math_veraMOD63 points·7 months ago

This is an urgent-care question wearing a forum question's clothes. Please contact a clinician rather than waiting for replies.

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u/cardio_endpoint_c89 points·7 months ago

show your working or it is unhelpful

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u/rosa_mensah83 points·7 months ago

swirl, do not shake, or you are courting oxidation

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u/karim_ilunga28 points·7 months ago

What was the vial size and how much bac water?

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u/janek_ferrari40 points·7 months ago

The single most useful thing I did was write the concentration on the vial. Stopped all the confusion after that.

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u/hub_opssite staff32 points·7 months ago·edited

Cosigning. The concentration on the vial in marker is load-bearing.

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u/soren_zamora16 points·7 months ago

Is that 30mg vial or 12mg?

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u/ines_ekstrom23 points·7 months ago

bacteriostatic and sterile water are not interchangeable, do not use them that way

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u/kavya_radich8 points·7 months ago

bacteriostatic and sterile water are not interchangeable, do not use them that way

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

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u/sock_puppet_spotter4 points·7 months ago

dosing errors come from people reconstituting two vials differently and forgetting which is which

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u/wanjiru_varga3 points·7 months ago

This is correct. 2mL versus 2mL is the common mistake.

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u/soren_zamora3 points·7 months ago

dosing errors come from people reconstituting two vials differently and forgetting which is which

Yes, exactly this, and it is the bit that took me 38 weeks to accept.

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About c/reconstitution

The arithmetic and the technique. Bacteriostatic versus sterile water, reconstitution volume as a concentration choice, converting mg/mL into insulin-syringe units, dead space, swirl-not-shake, stopper coring, and how long a reconstituted vial is actually good for. Math errors get corrected fast and politely.

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