A client receives a prescription for fentanyl 100 mcg IV every 1 to 2 hours PRN for severe pain. The medication is available in 0.05 mg/mL vial. How many ml should the nurse administer? (Enter numerical value only.)

Given: Ordered dose of Fentanyl: 100 mcg Concentration of Fentanyl: 0.05 mg/mL Step 1: Convert mcg to mg: Ordered dose (mg) = Ordered dose (mcg) / 1000 mcg/mg Ordered dose (mg) = 100 mcg / 1000 mcg/mg Ordered dose (mg) = 0.1 mg Step 2: Set up the proportion: Desired dose (mg) / Volume to administer (mL) = Concentration (mg/mL) Step 3: Substitute the values: 0.1 mg / Volume = 0.05 mg/mL Step 4: Solve for the unknown volume: Volume = 0.1 mg / (0.05 mg/mL) Volume = 0.1 mg x (1 mL / 0.05 mg) Volume = 2 mL