three years of dead space threads, summarised so you do not have to read them
three years of dead space threads, summarised so you do not have to read them. Not a hot take, just something I have not seen said plainly here. Adding more water does not change how much peptide is in the vial. It changes the concentration, which changes the volume you draw for the same amount. That is the entire…
Research-use-only material is not approved for human use, so treat everything in this thread as arithmetic about solutions rather than instructions for a person.
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.
units are a volume on a U-100 syringe, not a dose
Bacteriostatic water contains benzyl alcohol as a preservative, which is what makes repeated entry into the same vial reasonable.
This is the sentence that makes the rest unnecessary. Write it on the vial and the problem is gone.
reconstituting at a round concentration makes every later dose easy
more water is not more drug, it is the same drug in a bigger volume
That is sterile water, not bacteriostatic. Same appearance, different product, and it matters for a multi-draw vial.
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.