Standard Medical message bags to easily identify medication prescribed on an as needed basis. Used in hospital pharmacies to transfer medication (usually pain medication) to the patient in the clinic. PRN means "take as needed.” Inner packed in 100s. Medical Bags are available with blue or orange print. Convenient seal top closure Printed Orange or Blue ”PRN Return Empty Bag to Pharmacy”Inner packed in 100s Orange Medical bags available in four sizes Blue Medical Bags available in eight sizes