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 5% w/v. You need 95 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v95 mg
V = mL
2.Easy
sodium chloride2.25 g500 mL? % w/v

Practice exercise (made-up values, not clinical guidance). 2.25 g of sodium chloride is dissolved in water to a total volume of 500 mL. What is the percentage strength p (% w/v)?

2.25 g500 mL
p = %
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.48 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.48 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/mL800 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 800 000 units. What volume V do you draw up? Round to one decimal place.

3.2 mL → 1 000 000 units/mL800 000 units
V = mL
5.Hard
5%200 g+1%coal tar? g2%coal tar

Practice exercise (made-up values, not clinical guidance). You have 200 g of 5% coal tar ointment. How many grams m of 1% coal tar ointment must you add to make a 2% ointment? Round to the nearest whole gram.

200 g · 5%1%2%
m = g
6.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 3.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 525 mg. Draw up the dose: what volume V do you give?

1000 mg3.6 mL + 0.4 mL525 mg
V = mL

Answer key

  1. 1. V = 1.9 mL
  2. 2. p = 0.45 %
  3. 3. V = 4.8 mL
  4. 4. V = 0.8 mL
  5. 5. m = 600 g
  6. 6. V = 2.1 mL

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