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
Solution1:10 000? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:10 000 as a percentage strength p (% w/v).

1:10 000
p = %
2.Easy
0123455 mL

A solution is 5% w/v. You need 160 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v160 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/mL2 000 000 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 2 000 000 units. What volume V do you draw up? Round to one decimal place.

3.2 mL → 1 000 000 units/mL2 000 000 units
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/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
5.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 9.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 540 mg. Draw up the dose: what volume V do you give?

2000 mg9.6 mL + 0.4 mL540 mg
V = mL
6.Hard
20%120 g+0%base? g15%zinc oxide

Practice exercise (made-up values, not clinical guidance). You have 120 g of 20% zinc oxide ointment. How many grams m of plain ointment base (0%) must you add to make a 15% ointment? Round to the nearest whole gram.

120 g · 20%0%15%
m = g

Answer key

  1. 1. p = 0.01 %
  2. 2. V = 3.2 mL
  3. 3. V = 2 mL
  4. 4. V = 0.6 mL
  5. 5. V = 2.7 mL
  6. 6. m = 40 g

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