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.

New worksheetPractise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________   Date: ____________

1.Easy
Solution1:200? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:200 as a percentage strength p (% w/v).

1:200
p = %
2.Easy
sodium bicarbonate8.4% w/v10 mL? g

Practice exercise (made-up values, not clinical guidance). How many g of sodium bicarbonate are in 10 mL of 8.4% w/v solution? Find m.

8.4% w/v10 mL
m = g
3.Medium
ceftriaxone 2 gAdd 19.2 mL sterile water.Powder volume: 0.8 mL.1500 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains ceftriaxone 2000 mg as a powder. The practice label says to add 19.2 mL of sterile water; the powder adds 0.8 mL to the volume. The prescribed dose is 1500 mg. What volume V do you draw up? Round to one decimal place.

2000 mg19.2 mL+0.8 mL1500 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/mL750 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 750 000 units. What volume V do you draw up? Round to one decimal place.

18.2 mL → 250 000 units/mL750 000 units
V = mL
5.Hard
30%hydrogen peroxide+0%water? mL3%900 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 900 mL of 3% hydrogen peroxide from a 30% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

30%0%3%900 mL
V = mL
6.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 1.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 400 mg. Draw up the dose: what volume V do you give?

1000 mg1.6 mL + 0.4 mL400 mg
V = mL

Answer key

  1. 1. p = 0.5 %
  2. 2. m = 0.84 g
  3. 3. V = 15 mL
  4. 4. V = 3 mL
  5. 5. V = 810 mL
  6. 6. V = 0.8 mL

Full step-by-step solutions: practise this topic on examproblems.com.