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 2% w/v. You need 16 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v16 mg
V = mL
2.Easy
Solution1:5 000? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:5 000 as a percentage strength p (% w/v).

1:5 000
p = %
3.Medium
penicillin G 5 000 000 unitsdiluent addedconcentration18.2 mL250 000 units/mL8.2 mL500 000 units/mL3.2 mL1 000 000 units/mL600 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 3.2 mL of diluent. The prescribed dose is 600 000 units. What volume V do you draw up? Round to one decimal place.

3.2 mL → 1 000 000 units/mL600 000 units
V = mL
4.Medium
oxacillin 2 gAdd 11.5 mL sterile water.Powder volume: 1 mL.? 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. What is the concentration C in mg/mL after reconstitution?

2000 mg11.5 mL+1 mL
C = mg/mL
5.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 9.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 760 mg. Draw up the dose: what volume V do you give?

2000 mg9.2 mL + 0.8 mL760 mg
V = mL
6.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 9.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 880 mg. Draw up the dose: what volume V do you give?

2000 mg9.4 mL + 0.6 mL880 mg
V = mL

Answer key

  1. 1. V = 0.8 mL
  2. 2. p = 0.02 %
  3. 3. V = 0.6 mL
  4. 4. C = 160 mg/mL
  5. 5. V = 3.8 mL
  6. 6. V = 4.4 mL

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