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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1.Easy
dextrose5% w/v1000 mL? g

Practice exercise (made-up values, not clinical guidance). How many g of dextrose are in 1000 mL of 5% w/v solution? Find m.

5% w/v1000 mL
m = g
2.Easy
sodium chloride0.9 g100 mL? % w/v

Practice exercise (made-up values, not clinical guidance). 0.9 g of sodium chloride is dissolved in water to a total volume of 100 mL. What is the percentage strength p (% w/v)?

0.9 g100 mL
p = %
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.3 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.3 mg
V = mL
4.Medium
ceftriaxone 2 gAdd 19.2 mL sterile water.Powder volume: 0.8 mL.? 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. What is the concentration C in mg/mL after reconstitution?

2000 mg19.2 mL+0.8 mL
C = mg/mL
5.Hard
50%dextrose+10%dextrose? mL30%450 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 450 mL of 30% dextrose by mixing 50% and 10% dextrose. How many mL V of the 10% solution do you need? Round to the nearest whole mL.

50%10%30%450 mL
V = mL
6.Hard
0123455 mL

A vial holds 250 mg of powder. You add 4.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 175 mg. Draw up the dose: what volume V do you give?

250 mg4.5 mL + 0.5 mL175 mg
V = mL

Answer key

  1. 1. m = 50 g
  2. 2. p = 0.9 %
  3. 3. V = 3 mL
  4. 4. C = 100 mg/mL
  5. 5. V = 225 mL
  6. 6. V = 3.5 mL

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