Situation: I have a primary bag of NS infusing through a pump at 125mL/hr and I need to attach a secondary bag which has a medication in 50mL of solution needing to be infused at 100mL/hr. The piggybacks don't have lines of measurements so I can't verify if the bag has 50mL or more in it. I understand that when programming the IV pump, I program the settings for the primary line (rate and amount to be infused) and then I program the secondary line with the medication, mg of medication, mL of solution, and so on, and I double check to make sure the dose and rate match my calculations. I understand that the pump will count backwards from 50mL and once it hits 50mL it will go back to the primary line settings (in this case, 125mL/h). But what if the pharmacy DID send me a secondary bag with >50mL? Now medication will be administered at a different rate than what was ordered once the pump has infused 50mL. Should I automatically assume the pharmacy will send me the right amount of solution? Or should I assume the pharmacy sent me more than the ordered amount and should I set the amount to be infused of the secondary line higher? Thanks everyone for your responses.