Since when do nurses PRESCRIBE drugs, they administer what the doctor prescribes!!
I didn't say they did, (although some can after advanced training) however I can see that I was vague.
A Dr will prescribe X amount of a drug over time Z In some cases that will require the nurse to do various drug calculations to work out, say, how much to dilute drugs down or flow rate settings to use to administer that prescribed dose. IF they cock them up and/or set up the delivery machine wrong you will end up with an over/under dose.