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
sodium chloride0.45 g100 mL? % w/v

Practice exercise (made-up values, not clinical guidance). 0.45 g of sodium chloride is dissolved in water to a total volume of 100 mL. What is the percentage strength p (% w/v)?

0.45 g100 mL
p = %
2.Easy
Solution1:500? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:500 as a percentage strength p (% w/v).

1:500
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/mL400 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 400 000 units. What volume V do you draw up? Round to one decimal place.

18.2 mL → 250 000 units/mL400 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/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
0123455 mL

A vial holds 500 mg of powder. You add 4.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 130 mg. Draw up the dose: what volume V do you give?

500 mg4.2 mL + 0.8 mL130 mg
V = mL
6.Hard
23%sodium chloride? mL+3%sodium chloride13%400 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 400 mL of 13% 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%13%400 mL
V = mL

Answer key

  1. 1. p = 0.45 %
  2. 2. p = 0.2 %
  3. 3. V = 1.6 mL
  4. 4. V = 6 mL
  5. 5. V = 1.3 mL
  6. 6. V = 200 mL

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