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c/reconstitution·submitted 2 years ago by u/gradient_goblin

[Discussion] the mg/mL advice in here is 3 years out of date

Discussionbranch of 6 comments

the mg/mL advice in here is 3 years out of date. Change my mind, genuinely — I have no stake in being right about this. The relevant figures are 3 years, and they come from the same log I have kept the whole time. Bacteriostatic water contains benzyl alcohol as a preservative, which is what makes repeated entry into…

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6 comments, started 2 years ago
u/vial_math_verasyringe math77 points·2 years 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/piotr_bruun30 points·2 years ago

What is written on the vial right now?

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u/freya_onwuka15 points·2 years ago

What is written on the vial right now?

Adding one thing — put the date on the label too. Concentration plus date and you can never mix two vials up.

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u/viktor_erdogan22 points·2 years ago

What is written on the vial right now?

piotr_bruun has the units point exactly right. They are a volume on the barrel and nothing else.

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u/vito_beaulieu5 points·2 years ago·edited

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

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u/ruben_cabrera-5 points·2 years ago

more water is not more drug, it is the same drug in a bigger volume

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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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