Drug Calculation Worksheet #3 Answer Key
1.) The physician orders you to administer a lidocaine drip to a patient that weighs 100 kg. Your lidocaine comes packaged in 2g/5cc. You are using a 1 L bag of normal saline. The ordered dose is 2 mg/min. Using a 60 drop administration set, what is your rate in drops per minute?
Rate (in gtt/min) = (1000 ml)
(2 mg/min) (60gtt/ml) = 60 gtt/min
(2000 mg)
NOTE: Not a weight based
calculation
2.) What is your rate in ml/hour?
Rate (in ml/hr) = (60 gtt/min)
(60 min/hr) (1ml/60gtt) = 60 ml/hr
3.) What the concentration of your newly prepared drip that you should write on the bag in mg/ml?
Concentration = (2000 mg)
= 2 mg/ml
(1000 ml)
4.) What is the concentration of the drip in mcg/ml?
Concentration = (2 000 000
mcg) = 2000 mcg/ml
(1000 ml)
5.) What would the drip rate be if you used a 10 drop set instead of a 60 drop set?
New Rate (in gtt/min) = (1000
ml) (2 mg/min) (10 gtt/ml) = 10 gtt/min
(2000mg)
6.) The doctor orders you to administer a dobutamine drip to a patient that is hypotensive and showing signs of pulmonary edema. The patient weighs about 120 kg. The doctor orders you to administer 10 mg/kg/min using a microdrip administration set. You add 400 mg of dobutamine to a 250 cc bag. What is your initial administration rate in drops per minute?
Rate (in gtt/min) = (250
cc) (10 mg/kg/min)
(120 kg) (60 gtt/cc) = 45 gtt/min
(400
000 mg)
7.) What is the concentration of your drip in mcg/ml?
Concentration = (400 000
mcg) = 1600 mcg/ml
(250 cc)
8.) What would be the rate if you used a 10 drop set for your dobutamine drip?
New Rate = (250 cc)
(10 mg/kg/min)
(120 kg) (10 gtt/cc) = 7.5 gtt/min
~ 8 gtt/min
(400
000 mg)
9.) What is the concentration of the dobutamine drip in mg/ml?
Cocentration (in mg/ml) = (400
mg) = 1.6 gtt/min ~ 2 gtt/min
(250 ml)