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 25 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v25 mg
V = mL
2.Easy
Solution1:400? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:400 as a percentage strength p (% w/v).

1:400
p = %
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.76 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.76 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/mL2 400 000 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 2 400 000 units. What volume V do you draw up? Round to one decimal place.

18.2 mL → 250 000 units/mL2 400 000 units
V = mL
5.Hard
2.5%100 g+0.5%hydrocortisone? g1.5%hydrocortisone

Practice exercise (made-up values, not clinical guidance). You have 100 g of 2.5% hydrocortisone ointment. How many grams m of 0.5% hydrocortisone ointment must you add to make a 1.5% ointment? Round to the nearest whole gram.

100 g · 2.5%0.5%1.5%
m = g
6.Hard
50%dextrose? mL+10%dextrose30%250 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 250 mL of 30% dextrose by mixing 50% and 10% dextrose. How many mL V of the 50% solution do you need? Round to the nearest whole mL.

50%10%30%250 mL
V = mL

Answer key

  1. 1. V = 0.5 mL
  2. 2. p = 0.25 %
  3. 3. V = 7.6 mL
  4. 4. V = 9.6 mL
  5. 5. m = 100 g
  6. 6. V = 125 mL

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