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
Solution1:200? % 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
0123455 mL

A solution is 1% w/v. You need 37 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v37 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/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 3.2 mL of diluent. The prescribed dose is 1 500 000 units. What volume V do you draw up? Round to one decimal place.

3.2 mL → 1 000 000 units/mL1 500 000 units
V = mL
4.Medium
ceftriaxone 2 gAdd 19.2 mL sterile water.Powder volume: 0.8 mL.1200 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 1200 mg. What volume V do you draw up? Round to one decimal place.

2000 mg19.2 mL+0.8 mL1200 mg
V = mL
5.Hard
0123455 mL

A vial holds 250 mg of powder. You add 9.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 110 mg. Draw up the dose: what volume V do you give?

250 mg9.4 mL + 0.6 mL110 mg
V = mL
6.Hard
20%chlorhexidine+0%water? mL5%300 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 300 mL of 5% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

20%0%5%300 mL
V = mL

Answer key

  1. 1. p = 0.5 %
  2. 2. V = 3.7 mL
  3. 3. V = 1.5 mL
  4. 4. V = 12 mL
  5. 5. V = 4.4 mL
  6. 6. V = 225 mL

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