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c/reconstitution·submitted 1 year ago by u/quiet_reader_99

units are the most under-discussed thing on this board

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Something I keep coming back to: units are the most under-discussed thing on this board. Bacteriostatic water contains benzyl alcohol as a preservative, which is what makes repeated entry into the same vial reasonable. Plain sterile water has no preservative. If your calculation produces a fraction of a unit, the…

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6 comments, started 1 year ago
u/india_generic_g374 points·1 year ago

Is that a U-100 syringe? The barrel markings change the answer completely.

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u/oskar_kaufmann100 points·1 year ago

That is sterile water, not bacteriostatic. Same appearance, different product, and it matters for a multi-draw vial.

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u/quiet_reader_99OP73 points·1 year ago

reconstituting at a round concentration makes every later dose easy

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u/ines_lindqvist17 points·1 year ago

Disagree with the "more water is safer" framing. It is not safer, it is just a different number to divide by.

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u/quiet_reader_99OP12 points·1 year ago

Correcting myself above: I wrote the concentration the wrong way up. Mass over volume, not volume over mass.

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u/janek_ferrari4 points·1 year ago

units are a volume on a U-100 syringe, not a dose

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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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