If medications remain in an IV bag, is it used or unused for the purposes of hazardous waste categorization?

Medication remaining in an IV bag (or other container) is unused for the purposes of hazardous waste categorization. This is true even if a portion of the medication was administered (i.e., used) and the remaining medication is prohibited from being administered to another patient. The P and U hazardous waste listings only apply to unused commercial chemical products. So, if medication remaining in a container is discarded, that portion is unused and must be evaluated to determine if it is a listed or characteristic hazardous waste.