[Meta] proposal — a flair for reconstitution posts
proposal — a flair for reconstitution posts — posting the reasoning in public because a policy you cannot inspect is just a preference. Shook the first vial because nobody told me not to. It was fine, but I have swirled every one since. Wrote the date on the vial as well as the concentration after losing track of…
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.
Disagree with the "more water is safer" framing. It is not safer, it is just a different number to divide by.
Bacteriostatic water contains benzyl alcohol as a preservative, which is what makes repeated entry into the same vial reasonable.
Disagreeing with this line only: adding more water is not a safety margin, it is a different divisor.
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a U-100 syringe reads 100 units to the millilitre, every time
Same. I got this wrong once, caught it because the units looked absurd, and have written on every vial since.
What is written on the vial right now?
Is that a U-100 syringe? The barrel markings change the answer completely.
The dead space question sent me down a rabbit hole for a week. It is a fraction of a unit and it is the same every draw.
Small fix — a U-100 syringe is 100 units per mL. If yours is marked differently it is not U-100 and the whole calculation changes.
That is sterile water, not bacteriostatic. Same appearance, different product, and it matters for a multi-draw vial.