I roll the multiDose Vial around in hands to mix/warm it, don't shake (except suspensions, do shake them).
*Wipe the top of stopper w/ alcohol, then inject the same amt of air as described.
With ampules its also good to wipe the neck area w/ alcohol prior to scoring w/ file.
I like 20s or 21s to drawl. Don't touch anything w/ hands, or let come in contact with anything else
while I'm changing to a 23 or 25ga of the proper length for the particular muscle to be injected.
I leave original the 25ga needle in the wrapper by unscrewing the hypo, then switch to that 20 or 21 to fill.
NEVER LET NEEDLES TOUCH ANYTHING! Throw the needle away if it does!
I wash the muscle area w/ hot water and soap, then wipe w/ alcohol a couple times . Never a problem.