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[Question] the UK — has anyone got a straight answer on bacteriostatic water

Question Long Haul ×4 Well Actually ×2

Trying to settle this properly because the thread from last year went in circles.

The claim: bacteriostatic water matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 7 months without either producing anything.

What would actually settle it is 35 people measuring the same thing the same way. I have started; my numbers are below. They lean one way but not strongly enough for me to declare victory.

If you have data, post the data. If you have an opinion, flair it as an opinion.

1,805 up / 609 down75% upvoted35 commentsid 12pw4k11 Jan 2025

35 comments

16 in this archive, depth 3

best — the order this archive was captured in

u/batch_number_bertievetting81 points·1 year ago

stopper coring on the 23th draw because you keep using the same entry point. rotate.

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u/vial_math_veraMOD43 points·1 year 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/emil_zamora43 points·1 year ago

Is that 30mg vial or 27mg?

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u/ines_lindqvist18 points·1 year ago

Is that 30mg vial or 27mg?

Adding to this: mg/mL is doing more work than the comment implies.

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u/cardio_endpoint_c10 points·1 year ago

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

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u/escrow_evangelist36 points·1 year ago

Every time this gets posted it hits the front page and every time someone has to re-explain it.

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u/dilara_szabo27 points·1 year ago·edited

swirl, do not shake, or you are courting oxidation

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u/hedda_adeyemi15 points·1 year ago

Rodent data is rodent data. Dose scaling is not linear and the models tell you what to investigate, not what to expect.

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u/priya_weiss9 points·1 year ago

Is that 5mg vial or 23mg?

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u/kenji_kimani14 points·1 year ago
genuinely useful, thanks
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u/declared_value_dv4 points·1 year ago·edited

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

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u/hedda_ekstrom-6 points·1 year 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/ledger_modmod · vetting7 points·1 year ago

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

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u/signe_grimaldi6 points·1 year ago

What was the vial size and how much bac water?

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u/bac_water_banditreconstitution9 points·1 year ago

i am begging people to write down the concentration

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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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