Calculate the amount to administer:_____________ (Round appropriately) Ordered: Lanoxin 135 mcg IM now On hand: Lanoxin 0.25 mg/mL

Desired dose = 135 mcg. Convert the desired dose from micrograms (mcg) to milligrams (mg) to match the available concentration's unit. Since 1 mg = 1000 mcg, Desired dose in mg = 135 mcg / 1000 mcg/mg = 0.135 mg. Available concentration = 0.25 mg/mL. Calculate the volume to administer. Volume (mL) = Desired dose (mg) / Available concentration (mg/mL) = 0.135 mg / 0.25 mg/mL = 0.54 mL.