Be sure to read the label. Be sure vaccines and drugs are adequately mixed. Large bottles of vaccines and drugs should be inverted regularly to be sure they stay properly mixed. Mix only enough vaccine to last for an hour or less.
Vaccines lose potency within hours after mixing.
This reduces the chance that the vaccine will become contaminated. Discard any leftover vaccine. When not in use, store vaccines in a cool place. Choose the right sized needle. Eject air from the syringe after loading it with vaccine or drug.