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c/reconstitution·submitted 1 months ago by u/tl_dr_tina

the bacteriostatic water thing finally clicked for me and I want to write it down

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Posting this as a discussion rather than a claim: the bacteriostatic water thing finally clicked for me and I want to write it down. Why "more water" keeps confusing people, including me for a month. The vial contains a fixed amount of peptide. Water changes nothing about that amount. What it changes is…

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8 comments, started 1 months ago
u/adaeze_cabrera78 points·1 months ago

If your calculation produces a fraction of a unit, the concentration is wrong for your dose. Change the water volume until the numbers land on whole units.

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u/hub_opssite staff26 points·1 months ago·edited

Pushback on the syringe advice: a U-100 barrel reads units of volume. Calling them "doses" is how the confusion starts.

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u/tl_dr_tinaOP15 points·1 months ago

do the arithmetic before you reconstitute, not while holding a syringe

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u/tl_dr_tina5 points·1 months ago·edited

label the vial with the date as well as the concentration

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u/ines_lindqvist7 points·1 months ago

Shook the first vial because nobody told me not to. It was fine, but I have swirled every one since.

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u/lyophile_lou-10 points·1 months ago

Show the arithmetic — where did the unit figure come from?

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u/tl_dr_tinaOP16 points·1 months ago

Correction: that gives 5 units, not what you have written. 30mg into 1mL is 30mg/mL and the division follows from there.

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u/tl_dr_tinaOP47 points·1 months ago

How many mg in the vial and how many mL are you adding?

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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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