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 19 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v19 mg
V = mL
2.Easy
0123455 mL

A solution is 1% w/v. You need 27 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v27 mg
V = mL
3.Medium
penicillin G 5 000 000 unitsdiluent addedconcentration18.2 mL250 000 units/mL8.2 mL500 000 units/mL3.2 mL1 000 000 units/mL300 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 300 000 units. What volume V do you draw up? Round to one decimal place.

18.2 mL → 250 000 units/mL300 000 units
V = mL
4.Medium
oxacillin 2 gAdd 11.5 mL sterile water.Powder volume: 1 mL.500 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains oxacillin 2000 mg as a powder. The practice label says to add 11.5 mL of sterile water; the powder adds 1 mL to the volume. The prescribed dose is 500 mg. What volume V do you draw up? Round to one decimal place.

2000 mg11.5 mL+1 mL500 mg
V = mL
5.Hard
0123455 mL

A vial holds 250 mg of powder. You add 1.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 212.5 mg. Draw up the dose: what volume V do you give?

250 mg1.4 mL + 0.6 mL212.5 mg
V = mL
6.Hard
23%sodium chloride? mL+3%sodium chloride8%200 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 200 mL of 8% sodium chloride by mixing 23% and 3% sodium chloride. How many mL V of the 23% solution do you need? Round to the nearest whole mL.

23%3%8%200 mL
V = mL

Answer key

  1. 1. V = 3.8 mL
  2. 2. V = 2.7 mL
  3. 3. V = 1.2 mL
  4. 4. V = 3.1 mL
  5. 5. V = 1.7 mL
  6. 6. V = 50 mL

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