Pharmacy calculations

QUESTION 1

You receive an order for heparin 12000 units in 250 mL D5W. If the strength of the heparin available is 5000 units/mL, how many mL of heparin do you use?

QUESTION 2

Calculate the number of milliliters required to prepare the following concentration:
37.5 mg methotrexate (stock: methotrexate 50 mg/2 mL)

QUESTION 3

Calculate the number of milliliters required to prepare the following concentration:
1050 mg fluorouracil (stock: fluorouracil 50 mg/mL)

QUESTION 4

Calculate the number of milliliters required to prepare the following concentration:
62.5 mg doxorubicin (stock: doxorubicin 50 mg/25 mL)

QUESTION 5

If there is 20 mg of a drug in 10 mL of solution, how many liters of solution will contain 1 g of the drug?

QUESTION 6

A vial of penicillin contains 3 million units of the powdered drug. How many mL of diluent is needed to make a solution containing 400000 units of this drug per cc? (Assume no powder volume.)

QUESTION 7

You have just added 0.2 mL of folic acid to an IV bag. How many mg of folic acid have you added if the stock solution contains 5 mg folic acid per mL?

QUESTION 8

Elixir of digoxin contains 50 mcg per mL. How many mcg are in 0.3 mL of the solution?

QUESTION 9

How many mL of vitamin B ₁₂ injection (1000 mcg/mL) must be added to an IV bag to obtain a dose of 0.5 mg of vitamin B ₁₂?

QUESTION 10

Potassium chloride 30 mEq is to be given in 1000 mL of IV fluid. Available vials contain 40 mEq/20 mL. How many mL of the drug would you use?

QUESTION 11

How many mL of aminophyllin solution (500 mg/20 mL) is needed to prepare 350 mg aminophyllin in 100 mL D5W?

QUESTION 12

Levothyroxine comes in 500 mcg vials. If the powder is diluted with 10 mL of sterile water, how many mL are required to provide 0.1 mg?

QUESTION 13

You receive an order for 0.2 g of a drug. You have a 5 mL vial labeled 100 mg/mL. How many mL are required?

 

 

QUESTION 14

Cleocin IV comes as 600 mg/4 mL. How many mL are needed to make a piggy-back of 750 mg in 100 mL of 0.9% sodium chloride injection?

QUESTION 15

An injection solution is available in a 2.9 mg/5 mL concentration. A patient’s required dose is 5.22 mg in 500 mL 0.9% sodium chloride solution. How many mL of the injection solution are needed?

QUESTION 16

A single IM dose of 2.4 million units of penicillin G is ordered by the physician. The concentration of the injection suspension is 600000 units per mL in 1 mL, 2 mL, and 4 mL vials. How many mL of the suspension are required?

QUESTION 17

Clonidine injection is available as 10 mL vials containing 100 mcg/mL. A patient order is for 0.2 mg daily in 2 equal doses. How many mL will be needed for each dose?

QUESTION 18

A patient is given 10.8 mL of phenytoin as a loading dose. Phenytoin is available as 50 mg per mL in 2 mL and 5 mL vials. What is the dose in mg that the patient received?

QUESTION 19

A patient requires 30 units of oxytocin by IV infusion in 1000 mL of fluid. Oxytocin is available as 10 units per mL. How many mL will the patient need?

QUESTION 20

A 500 mL TPN needs the addition of 33 mEq of sodium chloride. The label on the vial of concentrated sodium chloride injection has the following information: 30 mL single dose, 234 mg/mL, 4 mEq/mL, and 23.4%. How many mL should be added to the TPN bag? ( Hint: mEq means milliequivalent.)

QUESTION 21

Atropine sulfate injection 0.4 mg per mL is available in the pharmacy. The doctor orders 0.8 mg. How many mL will complete this order?

QUESTION 22

A patient is ordered Novolin R 54 units. The Novolin R available is 1000 units in a 10 mL vial. How many mL will the patient require?

QUESTION 23

An injectable medication is available as 2 mg/mL in 1 mL and 10 mL vials. The patient order is for 0.5 mg in 50 mL NS IVPB t.i.d. What is the total amount in mL of drug that the patient will receive per day? ( Hint: NS means normal saline; IVPB means intravenous piggy back.)

QUESTION 24

A physician order reads 3 million units of penicillin q4h. The reconstituted powder is available as 500000 units/mL. What will be the total mL needed for 24 hours?

QUESTION 25

Ninety-six millimols (96 mmols) of potassium phosphate is to be added to an infusion over 4 to 6 hours. Potassium phosphate is available as 3 mmol/mL in 5 mL, 15 mL, and 50 mL vials. How many mL are needed for this infusion?