#reconstitution 2025-06-03

anyone got a photo of what a properly dissolved vial looks like

does temperature of the bac water matter at all

it should be completely clear with no floaters. cloudy means stop
if the powder is on the stopper, tap it down before you add anything. it will still dissolve either way

nobody here should be telling you a dose. we can check your arithmetic, thats a different thing

does it matter if i inject the bac water straight at the powder

15mg in 3ml is 5mg/ml. same numbers as 10 in 2, just more of it

first vial arrived. 5mg. i am supposed to be taking 250mcg

so that is 250 out of 5000, one twentieth of the vial

correct so far

i put 5ml in, so a twentieth of 5ml is 0.25ml. 25 units?

the arithmetic is right and the recon volume is wrong

wrong how, 25 is a nice round number

5ml into a 5mg vial gives you 1mg/ml. that is a lot of water for a starting dose

also a 5mg vial usually will not physically hold 5ml

...it holds 3ml maybe

there it is

put 1ml in. 5mg/ml. 250mcg is 0.05ml, which is 5 units

0.05ml feels like nothing

it is nothing. that is the point. the drug is potent and the water is only a carrier

leaving this here because it comes up weekly: mcg and mg are a thousand apart and people type them interchangeably

if a number looks a thousand times off, it usually is

i did write 250mg in my own notes earlier

the other thing nobody warns you about is the needle hub

if you draw up with one pin and inject with another, whatever is sitting in the hub does not go in you

on a fixed-needle insulin syringe the dead space is tiny. on a luer hub it is not tiny at these volumes

which is why most of us use a plain u100 insulin syringe and accept the blunter draw-up

so one syringe, draw and inject with the same thing

yes. cheaper as well

over-dilution has a measurement side too. the fewer units you draw, the bigger a half-unit error is in percent

so the answer to your original question is 5 units and not 25, and the reason is the vial, not the maths

got there eventually

photo of the 3ml graduation on the glass, for anyone who has not held one yet

thanks. mixing properly this time