Question

An 8 kg infant requires a drug to run at 1 mL/hr continuously and delivers 4 mcg/kg/min of drug. Calculate the milligrams of drug that must be added to a 100 mL D5W intravenous infusion solution?

Answer 1

( 4 mcg / kg min   )   = ( 4 mg / 1000 ) / kg.min

                                  = 0.004 mg / kg.min

for 8 kg   = ( 0.004 mg / kg.min ) x 8 kg

               = 0.032 mg / min

mass / volume   = 0.032 mg / min ) / 1 mL / 60 min

                       = 1.92 mg / mL

for 100 mL = 1.92 x 100

                      = 192 mg

drug needed = 192 mg