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

5% w/v150 mg
V = mL
2.Easy
glycerin50 g250 mL? % w/v

Practice exercise (made-up values, not clinical guidance). 50 g of glycerin is dissolved in water to a total volume of 250 mL. What is the percentage strength p (% w/v)?

50 g250 mL
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/mL800 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 8.2 mL of diluent. The prescribed dose is 800 000 units. What volume V do you draw up? Round to one decimal place.

8.2 mL → 500 000 units/mL800 000 units
V = mL
4.Medium
oxacillin 2 gAdd 11.5 mL sterile water.Powder volume: 1 mL.? mg/mL

Practice exercise (made-up values, not clinical guidance). A vial contains oxacillin 2000 mg as a powder. The practice label says to add 11.5 mL of sterile water; the powder adds 1 mL to the volume. What is the concentration C in mg/mL after reconstitution?

2000 mg11.5 mL+1 mL
C = mg/mL
5.Hard
23%sodium chloride+3%sodium chloride? mL5%1000 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 1000 mL of 5% sodium chloride by mixing 23% and 3% sodium chloride. How many mL V of the 3% solution do you need? Round to the nearest whole mL.

23%3%5%1000 mL
V = mL
6.Hard
2.5%120 g+0.5%hydrocortisone? g1%hydrocortisone

Practice exercise (made-up values, not clinical guidance). You have 120 g of 2.5% hydrocortisone ointment. How many grams m of 0.5% hydrocortisone ointment must you add to make a 1% ointment? Round to the nearest whole gram.

120 g · 2.5%0.5%1%
m = g

Answer key

  1. 1. V = 3 mL
  2. 2. p = 20 %
  3. 3. V = 1.6 mL
  4. 4. C = 160 mg/mL
  5. 5. V = 900 mL
  6. 6. m = 360 g

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