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c/reconstitution·submitted 3 days ago by u/cesar_ivaturi

mg ÷ mL, that is the whole formula, why did i find this hard

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mg ÷ mL, that is the whole formula, why did i find this hard, which sounds obvious until you try to state the evidence for it. Started reconstituting everything to a round concentration and the six-in-the-morning error rate went to zero. The whole calculation, once, with real numbers. You have a 30mg vial. You add…

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6 comments, started 2 days ago
u/georgi_adebayo51 points·2 days ago

Did the maths give you a whole number of units, or a fraction?

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u/cesar_ivaturiOP20 points·2 days ago

Asked WWB what volume they reconstitute to for their own stability testing and they answered in one line. Useful thing to know.

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u/ruben_cabrera14 points·2 days ago

That only works if the fill weight is exactly the label weight, and it usually is not exactly anything.

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u/alcohol_aversion12 points·2 days ago

What is written on the vial right now?

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u/rasmus_mensah17 points·2 days ago

label the vial with the date as well as 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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