how much of what we believe about concentration actually comes from mg/mL threads
Asking properly rather than in a comment on somebody else’s thread: how much of what we believe about concentration actually comes from mg/mL threads. Why "more water" keeps confusing people, including me for a month. The vial contains a fixed amount of peptide. Water changes nothing about that amount. What it…
do the arithmetic before you reconstitute, not while holding a syringe
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
Agreed — units are volume. Once that lands, the rest of the arithmetic is one division.
Correction: that gives 20 units, not what you have written. 5mg into 1mL is 5mg/mL and the division follows from there.
swirl, never shake
Right — the volume you add is the only variable you control here, and the cake does not change it meaningfully.
if the maths gives you a fraction of a unit, change the concentration