Pharmacy calculations worksheet with answers

Free printable Pharmacy calculations worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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Name: ____________________   Date: ____________

1.Easy
0123455 mL

A solution is 0.5% w/v. You need 10.5 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v10.5 mg
V = mL
2.Easy
0123455 mL

A solution is 5% w/v. You need 100 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v100 mg
V = mL
3.Medium
cefuroxime 750 mgAdd 7.2 mL sterile water.Powder volume: 0.3 mL.300 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains cefuroxime 750 mg as a powder. The practice label says to add 7.2 mL of sterile water; the powder adds 0.3 mL to the volume. The prescribed dose is 300 mg. What volume V do you draw up? Round to one decimal place.

750 mg7.2 mL+0.3 mL300 mg
V = mL
4.Medium
penicillin G 5 000 000 unitsdiluent addedconcentration18.2 mL250 000 units/mL8.2 mL500 000 units/mL3.2 mL1 000 000 units/mL1 500 000 units → ? mL

Practice exercise (made-up values, not clinical guidance). A vial of penicillin G contains 5 000 000 units. Its practice label gives three strengths (see the table). You add 18.2 mL of diluent. The prescribed dose is 1 500 000 units. What volume V do you draw up? Round to one decimal place.

18.2 mL → 250 000 units/mL1 500 000 units
V = mL
5.Hard
20%chlorhexidine+0%water? mL2%300 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 300 mL of 2% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

20%0%2%300 mL
V = mL
6.Hard
20%chlorhexidine+0%water? mL4%1000 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 1000 mL of 4% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

20%0%4%1000 mL
V = mL

Answer key

  1. 1. V = 2.1 mL
  2. 2. V = 2 mL
  3. 3. V = 3 mL
  4. 4. V = 6 mL
  5. 5. V = 270 mL
  6. 6. V = 800 mL

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